First slide

Viscous flow/Laminar flow

Question

A square plate of 1 m side moves parallel to a second plate with velocity 4 m/s. A thin layer of water exists between plates. If the viscous force is 0.002N and the coefficient of viscosity is 0.01 poise then find the distance between the plates in m.

Moderate

Solution

$F = \frac{η A v}{d} \Rightarrow d = \frac{η A v}{F} = \frac{0.01 \times 10^{- 1} \times 1^{2} \times 4}{0.002} = 2 m$

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