Looking at flow with coffee and milk 2 (behind a square rod)

Let's take a look!

What type of experiment is this?

Experimental procedure and explanation:

• Float milk on coffee and observe the flow .
• When you move the square rod, a circulating flow (vortex) is created behind it, and this phenomenon is called "separation". This is the same as with the card (Looking at flow with coffee and milk 1).
• The flow cannot turn sharply. In the case of an object such as a flat plate, the flow bends at a right angle at the end and cannot wrap around behind, creating a vortex.
• The vortices generated by separation (separation vortices) move away from the square rod sequentially.
• The technology to visualize this flow this is called "flow visualization". It is often used in fluid dynamics research and development.
• After the experiment was over, the staff enjoyed the coffee used in this experiment.

[Caution]	As with the case of the card (Looking at flow with coffee and milk 1), this is a "seemingly turbulent flow", but this experimental video does not demonstrate a "turbulent flow"; rather, this is a "laminar flow". You can see that the milk line remains clearly.
[Keywords]	Flaking, flow visualization
[Related items]	Looking at flow with coffee and milk 1, Looking at flow with coffee and milk 3
[Reference]	“Illustrated Fluid Dynamics Trivia,” by Ryozo Ishiwata, Natsume Publishing, P68-69. “The Wonders of Flow,” Japan Society of Mechanical Engineering, Kodansha Blue Backs, P174-179.

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