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Newsletter  2014.1  Index

Theme : "The Conference of Fluid Engineering Division"

  1. Preface
    M.Oshima, Y. Takahashi, H. Yoshikawa
  2. Development of coaxial electromagnetic energy conversion device for efficient wind energy utilization
    Akira TANIDA, Hidemasa TAKANA (Tohoku University)
  3. Augmentation and attenuation of large-scale intermittent structures in rotating channel flow
    Takahiro ISHIDA (Tokyo University of Science)
  4. An attempt to measure wall shear stress fluctuation in a turbulent wall jet
    Takuya SAWADA, Osamu TERASHIMA, Yasuhiko SAKAI, Kouji NAGATA, Mitsuhiro SHIKIDA, Yasumasa ITO (Nagoya University)
  5. Concentration statistics near the turbulent / non-turbulent interface of a planar liquid jet with a chemical reaction
    Takahiro NAITO, Tomoaki WATANABE, Yasuhiko SAKAI, Kouji NAGATA, Yasumasa ITO, Osamu TERASHIMA (Nagoya University)
  6. The valuable experience of the Dreams of Flow Contest
    Tsubasa OZAKI, Jumpei OHKUBO, Hiroaki KOBAYASHI, Kodai FUJITA (Hokkaido University)
  7. A story of creation for Dreams of Flow Contest
    Kodai FUJITA, Hiroaki KOBAYASHI (Hokkaido University)

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The valuable experience of the Dreams of Flow Contest


Tsubasa Ozaki

Jumpei OHKUBO

Hiroaki KOBAYASHI

Kodai FUJITA
Hokkaido University

Abstract

We participated in JSME 12th Dreams of Flow Contest at Kyushu University. Here, I summarized my tough process to reach the contest, my impression of participating in this contest and my work.

By chance, fortunately, I discovered an interesting phenomenon that is a beautiful starry sky created by bubbles. We used an acrylic tank with transparent bottom. Then the bubbles were generated on the liquid surface by using the washing bottle named “star generator”. After that we illuminated the bubbles from bottom of the tank by a smart phone’s light as light source. The mechanism of this work is so simple and you can also see the beautiful starry sky in your home.

The principle of this phenomenon is also simple. Bubbles play a role of lens and concentrate incident light from the bottom of the tank to the bubbles. . Fig.1 shows a beautiful starry sky created by “Fluid Planetarium”, where the tank is filled by coffee with sugar diluted with water. As you can see in Fig.1, there are several stars. Fig.2 shows the result with cleaning solution of contact lens diluted with water. This liquid provides more beautiful starry sky (Fig.2) than that with the coffee (Fig.1). Starry sky obtained with mixture of salad oil and water shows great difference (Fig. 3) against the others. The most suitable liquid for the “Fluid Planetarium”, we believe so, in our examinations is Japanese sake!! Fig. 4 shows the corresponding starry sky. We investigated various daily liquid, and we conducted that Japanese sake is the best for the “Fluid Planetarium”. Another attraction is a moment of star disappearance (i.e. break-up of bubbles). We can feel the mutability of the “Fluid Planetarium”.

We greatly appreciate for all persons who cooperate with us. I’m thankful for all members of executive committee who gave me this valuable opportunity.

 

Key words

Fluid Dynamics, Multi-phase Flow, Bubble, Dreams of Flow Contest

 

Figures


Fig.1  A photo of starry sky using coffee


Fig.2  A photo of starry sky using cleaning solutions of contact lens


Fig.3  Photos of starry sky using salad oil


Fig.4  A photo of starry sky using Japanese sake as the best liquid
for the “Fluid Planetarium”

Last update: 1.16.2014