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Mechanical Properties of Fluids
Question
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How the rate of flow of fluid through capillary tube will change when the diameter of the capillary tube is reduced to half?

Answer

According to Poiseuille’s equation, the rate of flow of fluid through capillary tube is directly proportional to fourth power of diameter.

i.e.,                      V ∝ d4

If d is changed to d/2, then rate of flow will decrease to V/16. 

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