To calculate the rate of flows of a liquid, which of the following is used :

Stoke's law

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Bernouli Theorem

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Poissuelli's Law

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conservation for pressure

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Solution

The correct option is D Poissuelli's Law
In the case of smooth flow (laminar flow), the volume flowrate is given by the pressure difference divided by the viscous resistance. This resistance depends linearly upon the viscosity and the length, but the fourth power dependence upon the radius is dramatically different.

This is known as the Poissuelli's Law

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