Question 41. Reynolds analogy is given by

Question 42. Ambient air at 20 degree Celsius flows past a flat plate with a sharp leading edge at 3 m/s. The plate is heated uniformly throughout its entire length and is maintained at a surface temperature of 40 degree Celsius. Calculate the local convective heat transfer coefficient. Assume that transition occurs at a critical Reynolds number of 500000

Question 43. The transition from laminar to turbulent pattern of flow occurs at values of Reynolds number between

Question 44. The entrance length required for the flow to become fully-developed turbulent flow is dependent on
(i) Surface finish
(ii) Downstream conditions
(iii) Fluid properties
Identify the correct answer

Question 45. What is the value of thickness of the boundary layer at leading edge of the plate?

Question 46. Glycerin at 10 degree Celsius flows past a flat plate at 20 m/s. Workout the velocity components at a point P(x, y) in the fluid flow where
x = 2 m from the leading edge of the plate
y = 5 cm from the plate surface
For glycerin at 10 degree Celsius, kinematic viscosity = 2.79 * 10¯³ m²/s

Question 47. The boundary layer thickness is taken to be at a distance from the plate surface to a point at which the velocity is given by