Catching Particles Floating in Water

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What type of experiment is this?

Experimental procedure and explanation:

• We are going to use the undersides of two containers to catch scraps of paper floating in water.
• The more quickly we try to catch the scraps of paper, the more scraps of paper escape. When the bottoms of the containers get close together, the water between them flows outwards; the scraps of paper are carried away by this flow to escape. For this experiment, the containers must have flat bottoms; if the bottoms are dented, water will stay inside, and therefore it will be easier to catch the scraps of paper.
• Small, light objects have a tendency to get carried by a flow; this is referred to as having good entrainability.

[Keywords]	Entrainability, Viscous resistance
[Related items]	Catching Particles at the Bottom of a Volume of Water, Catching Particles Floating on the Surface of Water
[Reference]	“The Wonders of Flow,” Japan Society of Mechanical Engineering, Kodansha Blue Backs, P30・・1.