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# Enjoy Fluid Experiments Lab.

## Preface

This page is designed so that grade school and middle school students, as well as people in general, can get to know the fascinating world of science and fluid mechanics. This Lab offers “fluid experiments” that you can enjoy using everyday materials around you. The experiments are courtesy of the contributors; they are presented here under the responsibility of the fluids engineering division. Please watch for more enjoyable content that may be added at any time, thanks to Professor Ryozo Ishiwata of Kanagawa Institute of
Technology and others who are supporting this project.
(Videos of experiments are published on YouTube.)

The Japan Society of Mechanical Engineers, Fluids Engineering Division

Contact

To provide content or comments regarding the experiments, please contact the network staff, fluids engineering division, at net-admin@jsme-fed.org

 Vol. 41 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Separation, Flow visualization Looking at flow with coffee and milk 1 (behind a card) Float the milk on the coffee and move the card Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.10.1 Separation, Flow visualization Looking at flow with coffee and milk 2 (behind a square rod) Float the milk on coffee and move the square rod Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.10.1 Separation, Karman vortex street, Flow visualization Looking at flow with coffee and milk 3 (behind a straw) Float the milk on coffee and move the straw Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.10.1

 Vol. 40 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Viscous friction Tube friction loss Spin around the thread ring Pass a thread through the side hole of the straw, tie a ring, blow the straw, and turn this ring. Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.8.1 Tube friction loss Is air sucked in or blown out? Let's see if air is sucked in and blown out from the side hole of the pipe. Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.8.1 Momentum theory Coandă effect Fountain with a dryer? Attach plastic strings to the dryer to make it look like a fountain. Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.8.1 Momentum theory Coandă effect Water hose Attach plastic strings to the blower to make it look like a water hose. Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2017.10.1

 Vol. 39 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Depth and pressure, Surface tension Stick a round object in a plastic bottle Let's stick a round object in an upside-down plastic bottle. Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.6.2 Depth and pressure, Surface tension Remove a ping-pong ball from water Attach a ping-pong ball to a plastic bottle turned upside down in the water and pull it up. Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.6.2

 Vol. 38 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Depth and pressure Surface tension Scoop the liquid with a straw Scoop the fluid by placing a straw in the fluid Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.4.1 Depth and pressure When the plastic bottle is upside down Try to stand a plastic bottle filled with water upside down from the water surface. Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.4.1 Depth and pressure Turn a plastic bottle with a hose upside down Connect the hose to a plastic bottle filled with water and put the other end on the water surface. Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.4.1 Depth and pressure Surface tension If you make a hole in the middle of a straw[Question][Answer] Put the liquid in the straw and cover the top with your finger. If you make a hole midway through... Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.4.1

 Vol. 37 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Buoyancy When ice melts [Question][Answer] Will the water surface rise or fall when the ice floating on the water melts? Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.2.2 Buoyancy When ice on a floating island melts [Question][Answer] Will the water surface rise or fall when the ice on the floating island melts? Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.2.2 Volume When discarding water in a cup [Question][Answer] Will the water surface rise or fall when the ice on the island melts? Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.2.2 Buoyancy When discarding water in a cup [Question][Answer] Will the water surface rise or fall if you discard the water in the cup placed on the floating island? Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.2.2 Buoyancy When sinking a stone in water [Question][Answer] Will the surface of the water rise or fall if the stone in a cup floating on water is discarded? Prof. Ryozo Ishiwata, Kanagawa Institute of Technolog 2016.2.2
 Vol. 36 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Flow in a gap, Viscous friction, Added mass Quickly Lifting a Plastic Sheet Lay tissue paper on a table; place a plastic sheet on it; and try pulling the plastic sheet upwards Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.12.1 Flow in a gap, Viscous friction A Simple Air Cushion Make a simple air cushion using a plastic bag Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.12.1 Flow in a gap, Viscous friction, Added mass Breaking A Disposable Chopstick Place a disposable chopstick on the edge of a table and try to break it with a stick Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.12.1

 Vol. 35 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Atmospheric pressure Sticking a Plastic Sheet to a Table Place a plastic sheet on a table and try pulling the plastic sheet upwards Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.10.1 Secret of Suction Cups Discover why a suction cup is shaped the way it is Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.10.1 Sticking a Plastic Sheet to the Ceiling Try sticking a plastic sheet to the ceiling Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.10.1

 Vol. 34 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Entrainability, Viscous resistance Catching Particles at the Bottom of a Volume of Water Use a cup to catch tea leaves at the bottom of a volume of water Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.8.1 Entrainability,Viscous resistance Catching Particles Floating in Water Use two blocks to catch scraps of paper floating in water Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.8.1 Entrainability,Viscous resistance Catching Particles Floating on the Surface of Water Use a cup to catch particles floating on the surface of water Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.8.1

 Vol. 33 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Air resistance, Terminal velocity Slowly-Falling Cupcake Cups Watch cupcake cups fall slowly because of air resistance Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.6.1 Water resistance, Terminal velocity Slowly Sinking Cupcake Cups Watch a cupcake cup slowly sink when it is submerged in water Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.6.1 Air resistance, Terminal velocity Two Cupcake Cups Coming Together in the Air Try dropping two cupcake cups, and see them come together in the air Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.6.1 Air resistance, Separation Falling Slowly, Falling Quickly Try changing the falling speed of paper by folding or rolling the paper Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.6.1

 Vol. 32 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Uniform flow Speed of Flow in a Straight River Observe the flow of particles floating on a straight stretch of river Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.4.1 Swirl flow, Free vortex Speed of Flow in a Curved River Observe the flow of particles floating on a curved stretch of river Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.4.1 Secondary flow Sediment in a Curved River Observe the sedimentation of particles in a curved stretch of river Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.4.1 Swirl flow, Secondary flow Flow in a Curved River that is Shallower on the Inside Observe the flow when a curved stretch of river is shallower on the inside Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.4.1

 Vol. 31 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Separation, Air Resistance Quickly Dropping Light Objects Introduces a method for quickly dropping a shopping bag or tissue paper. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.2.1 Air Flow Behind a Board How does air flow behind a board that is placed upright while the wind blows? Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.2.1 Gaining a Benefit Behind a Large Object Gain an advantage by running behind a large player during a marathon, etc. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2015.2.1

 Vol. 30 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Surface Tension Camphor Boat Cause a boat to move using a neutral detergent. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.12.3 Three One-Yen Coins Drip a neutral detergent in the center of three one-yen coins that are floating on water. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.12.3 Moving Particles on the Water Surface Move numerous particles floating on the water surface. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.12.3

 Vol. 29 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Surface Tension Swelled Water Surface What happens when you fill a teacup to the brim with water? Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.10.1 Water Droplets Gliding on the Surface of Water Drip water onto the surface of water to create a water droplet. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.10.1 Surface Tension, Water Repellency Floating a 10-Yen Coin What happens when a 10-yen coin is placed on a tissue paper floating on water? Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.10.1 Blowing Away Tissue Paper Blow away a tissue paper floating on water with a single breath. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.10.1

 Vol. 28 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Coanda Effect, Separation Mole Jump Cause a mole shaped model to float upward by blowing on it with a blower. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.8.1 Magnus Effect Corner Kick When rotation is skillfully communicated to a ball during a corner kick, the player can directly aim for the goal. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.8.1

 Vol. 27 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Coanda Effect Drawn in Spoon When a spoon is made to contact water flowing from a faucet, the spoon is drawn into the flow. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.6.1 Supporting a Ball with a Stick Try balancing a ball on a stick. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.6.1 Flow Around the Back of a Cylinder See how air flows when wind from a fan and a dryer is aimed at a cylinder. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.6.1 Circling Around a Pipe Try making water circle completely around a pipe when the pipe is squirted with water from a squirt gun. Prof. RyozoIshiwata,Kanagawa Instituteof Technology 2014.6.1

 Vol. 26 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Water depth and pressure, Potential energy Water Fountain 1 (Using Difference in Water Levels) A simple water fountain created using difference in water levels. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2014 Pressure Water Fountain 2 (Using Pressure) Pressure inside a container is increased to create a water fountain. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2014 Pressure Water Fountain 3 (Using Negative Pressure) Pressure inside a container is decreased to create a water fountain. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2014 Pressure, Buoyancy Water Fountain 4 (Cartesian Diver) A water fountain is created using a Cartesian Diver. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2014 Water depth and pressure, Potential energy Water Fountain 5 (Heron’s Fountain) A mysterious water fountain created using difference in water levels, with the water fountain spouting higher than the level of the water source. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2014

 Vol. 25 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Coanda effect Blowing Out a Candle Behind a Cylinder Blow out a candle placed behind a PET bottle. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2014 Separation Candle Behind a Flat Plate What happens when you blow on a flat block placed in front of a candle? Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2014 Coanda effect Blowing Through a Gap Blow out a candle by blowing through a gap between two cylinders. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2014

 Vol. 24 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Momentum theory, Pressure Floating an Egg When an egg is placed in a cup and the cup is filled with water, the egg floats upward. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2013 Air resistance, Drag, Pressure Eject a Ping Pong Ball with Your Breath When you insert a ping pong ball into a cup and blow vigorously, the ping pong ball flies out. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2013 Momentum theory, Pressure Force When Flow is Pushed Back Measure the force created when airflow from a dryer is applied to a bowl. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2013 Viscous friction Slowly Dropping Ball When a ball is dropped into a cylinder, it drops slowly. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2013 Momentum theory, Pressure Removing a Ball from a Cylinder Apply airflow from the top to a ball in a cylinder to float the ball upward. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2013 Momentum theory, Pressure Removing a Cup from a Cylinder Apply airflow from the top to a cup in a cylinder to float the cup upward. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2013

 Vol. 23 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Air resistance, Terminal velocity Raindrop Float a water drop by placing it in an updraft. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 10.1.2013 Parachute A parachute will increase air resistance and slow down the speed of fall. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 10.1.2013

 Vol. 22 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Magnus effect Magnus Pipe This toy flies in a mysterious way by utilizing rotation. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2013 Choke, Bernoulli’s theorem Sprayer 1 (With Necked Midsection) By pinching a straw’s midsection, suck water through a hole on the straw surface. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2013 Separation Sprayer 2 (Often Misunderstood Principle) Pressure will not decrease by simply blowing air through a straw. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2013 Viscous friction Inflate in a Single Breath Inflate a slender bag by blowing a single breath into the opening from a distance. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2013

 Vol. 21 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Jet, Vortex ring Air Cannon Shoot air through a circular hole in a cardboard box. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2013 Vortex, Vortex ring Ring of Air Make a ring of air by connecting small air bubbles inside a tank. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2013 Square Ring of Air? Would shooting water out of a square hole make a square ring of air? Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2013

 Vol. 20 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Law of conservation of angular momentum The Shorter the String, the Faster it will Turn Tie a string to a ball and rotate. Making the string shorter makes it rotate faster. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.4.2013 Law of conservation of angular momentum, Free vortex Inward Flow Increases the Rotational Speed Place a tray filled with water inside a rotating tub. Draining the water creates a vortex. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.4.2013 Coriolis force, Free vortex In Which Direction does a Typhoon Spin? Use a rotating tub to study how typhoons and tornadoes rotate. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.4.2013

 Vol. 19 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Drag Yacht Car 1 (Tailwind) Use a tailwind to make a yacht car (car with a sail) run. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2013 Lift Yacht Car 2 (Side Wind) The yacht car runs faster with a side wind than with a tailwind. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2013 Yacht Car 3 (Headwind) Make a yacht car run in the windward direction. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2013

 Vol. 18 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Lift Flat Plate Airfoil Blowing air at a flat plate held at an angle creates lift. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2012. Down Force Racecars use airfoils to create down forces (downward lift). Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2012.

 Vol. 17 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Drag, Air resistance Heavy Ball and Light Ball Between a heavy ball and a light ball of the same size, which one falls faster? Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 10.1.2012. Drag, Air resistance Large Ball and Small Ball Between a large ball and a small ball of the same weight, which falls faster? Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 10.1.2012.

 Vol. 16 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Buoyancy Cartesian Diver that Floats when Squeezed A Cartesian diver that floats when squeezed, contrary to the typical type. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2012 Buoyancy, Water pressure Bowls that Won’t Come Apart 1 Put two bowls together, submerge them in water, and release one hand. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2012 Buoyancy, Water pressure Bowls that Won’t Come Apart 2 The two bowls will come apart when moved closer to the water surface. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2012

 Vol. 15 *The page for each experiment will be displayed by clicking on the title. Category Title Content of the experiment Contributor, Last updated Siphon principle Siphon Principle Drain water from a tank using the siphon principle. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2012 Pipe friction loss Short Hose and Long Hose Compare the difference in flow volumes between short and long hoses. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2012 Pipe friction loss Large-Diameter Hose and Small-Diameter Hose Compare the difference in flow volumes between large- and small-diameter hoses. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2012 Siphon principle Disappearing Juice You get a little greedy and add more juice to the cup, only to see it disappear. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2012

 Vol. 14     *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Vortex Centrifuge Create a forced vortex by rotating the basin. Tea leaves will separate and accumulate around the edge of the basin. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2012 Updated 5.28.2012 Secondary Flow Collecting Tea Leaves Collect tea leaves at the bottom of a cup using a secondary flow. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2012 Updated 5.28.2012 Secondary Flow Secondary Flow Inside a Basin Stop the basin from a forced vortex condition. Tea leaves accumulate at the center by a secondary flow. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2012 Updated 5.28.2012 Secondary Flow Flow in a River at a Corner Emulate a secondary flow formed at corners of rivers to see how soil accumulates at the inside of the corners. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2012 Updated 5.28.2012

 Vol. 13    *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Air mass Large Balloon, Small Balloon Bang a large balloon against a small balloon in midair. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2012 Added mass Added Mass Crack a styrene foam board floating on water. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2012 Added mass Master of Karate Crack a styrene foam board by hitting it. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2012 Momentum Theory Jet Propulsion Obtain propulsion from air that exhausts from a balloon. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2012 Flow around an object Blowing Air across a Paper Blow on the top and bottom of a paper to make it rise. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2012

 Vol. 12   * The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Buoyancy Volume Measurement Measure the volume of an object using buoyancy. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2011 Surface tension Floating Japanese Penny Float a Japanese penny on water. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2011 Five-yen Coin Lens Form a water film on a five-yen coin to form a lens. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2011

 Vol. 11     * The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Bernoulli’s theorem A Balloon That Sticks to the Ceiling Stick a balloon to the ceiling, provided the gap between the disc and the ceiling is small enough. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 10.1.2011 Blow Air Between Two Sheets of Paper Draw two sheets of paper toward each other when air is blown between them. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 10.1.2011 Blowing Air Over a U-shaped Piece of Paper Blow on a U-shaped paper, but it will not be blown away. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 10.1.2011 Separation Blowing Away a Japanese Penny Blowing away a Japanese penny. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 10.1.2011

 Vol. 10     * The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Fluid energy The Height of Water and Its Energy Watch how the speed of flow from a hole depends on its height. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2011 Vortex Forced Vortex Form a forced vortex and observe the water surface. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2011 Cavitation Cavitation Pinch a section of a hose to create cavitation. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.1.2011

 Vol. 9     *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Fluid dynamic drag Jump with Buoyancy 1 Find differences in water resistance by using buoyancy to make a cube, a sphere, and a cone jump out of water. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.9.2011 Jump with Buoyancy 2 Make three kinds of plastic bottles jump due to buoyancy. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.9.2011 Dolphin Jump Confirm that a streamlined shape has little resistance. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.9.2011

 Vol. 8     * The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Separation vortex Sinking a Japanese Penny Underwater Watch a Japanese penny flutter as it sinks in water. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2011 No-Spin Shot Watch a ball, launched without spin, change its trajectory inconsistently. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2011 Viscosity Sinking a Japanese Penny in Oil Watch a Japanese penny sink in oil. It will not flutter because of viscosity. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2011

 Vol. 7     * The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Depth and pressure Water that Won't Fall Fill a glass with water, cover it with a lid, and turn it upside down. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2011 Water that Won't Overflow Cut a slit on the side of a plastic bottle and open it up. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2011 Vortex Free Vortex and Forced Vortex Create two different types of vortices. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.1.2011

 Vol. 6     *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Wind car Wind Car 1 (Spool of Thread Type) Make an interesting toy that runs on wind energy. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2010 Wind Car 2 (Gear Type) Make a wind car that transmits power through crown gears. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2010 Wind Car 3 (Semi-spherical Cup Type) Make a car that moves by wind acting on semi-spherical cups. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2010 Wind Car 4 (Windmill Type) Make a wind car that uses a rubber band to transmit power to the axle. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2010 Wind Car 5 (Brush Type) Make a wind car that does not have tires, but moves on a brush. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.1.2010

 Vol. 5   *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Magnus effect Magnus Cup Find the relationship between a spinning object and the surrounding flow. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.5.2010 Accelerated motion Acceleration of Water A light ball starts to move before a heavy ball does in accelerating water flow. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.5.2010 Carrying Water A tip on carrying water in a glass. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.5.2010 Surface tension Plastic Bottle with Holes Why water will not spill out of a plastic bottle that has holes in its sides. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 8.5.2010

 Vol. 4 *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Bernoulli’s theorem Two Plastic Bottles Blow air between two plastic bottles Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2010 Trapping a Ball Levitating a ball by blowing air. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 6.1.2010

 Vol. 3     *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Viscosity Water and Syrup 1 Compare the speeds of deformation of water, honey, and syrup. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2010 Water and Syrup 2 Rotate cups with water or syrup in them. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 4.1.2010

 Vol. 2     *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Flow around an object Lifting a Huge Balloon with Air (Related to A Balloon That Floats at an Angle) Float a balloon having a diameter of 90 cm. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.5.2010 The Principle behind Airfoil Study the airfoil principle, which is often misunderstood. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.5.2010 Coanda effect A Single Plastic Bottle Plastic bottles that are drawn to the wind source. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.5.2010 Circle and Square 2 (Blow up) Use a dryer to lift a sphere and a cube. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.5.2010 Circle and Square 3 (Flow Field) Observe the flow around a cylinder and around a rectangular box. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.5.2010 A Stroll with A Ball Watch a ball follow a flow. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 2.5.2010

 Vol. 1     *The page for each experiment can be accessed by clicking on its title. Category Title Content of the experiment Contributor, Last updated Coanda effect Circle and Square 1 (Which side will it fall toward?) Blow on a paper carton to make it topple. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.2.2009 Flow around an object Snow Man Use a straw to blow the head off a snowman. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.2.2009 A Cup that Rolls Toward You Roll a paper cup toward you by blowing on it with a straw. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.2.2009 A Balloon that Floats at an Angle Levitate a balloon at an angle using a dryer. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.2.2009 Effect of spinning Spinning Eggs How to tell a raw egg from a boiled egg without removing the shell. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.2.2009 Turning Bucket A bucket that starts to rotate again after being stopped. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.2.2009 Effect of buoyancy Cartesian Diver An interesting toy that floats and sinks. Prof. Ryozo Ishiwata, Kanagawa Institute of Technology 12.2.2009
Last Update：4.13.2021