QUESTION 14 Which of the following about fully developed laminar flow is false?

Question

QUESTION 14 Which of the following about fully developed laminar flow is false? a. Each particle moves at a constant axial velocity b. The velocity profile remains unchanged in the flow direction c. Acceleration can occur provided it is uniform and the flow remains laminar d. The velocity in the direction normal to the flow is zero QUESTION 15 Determine the dynamic viscosity of flow if the pressure drop of a fluid running with a flow rate of 880 mm^3/s through a pipe 1 m in length with a diameter of 0.5 mm is 1 MPa a. 7.98 * 10^-4 Ns/m^2 b. 9.23 * 10^-4 Ns/m^2 c. 1.43 * 10^-3 Ns/m^2 d. 1.74 * 10^-3 Ns/m^2

Explanation / Answer

14) Ans - (a) Not necessarily true

15) By poiseulle's equation Q(Volume flow rate) = ( pi * P * R4 ) / ( 8 * mu * L )

Hence mu = ( pi * P * R4 ) / ( 8 * Q * L ) = 1.74 x 10-3 Ns/m2

Hence Ans - (d)

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