Engine oil at 100°c and a velocity of 0.1 m/s flows over both surfaces of a 0.8-m-long flat plate maintained at 20°c. determine: (a)-the velocity and thermal boundary layer thicknesses at the trailing edge (b)-the local heat flux and surface shear stress at the trailing edge. (c)-the total drag force and heat transfer per unit width of the plate.

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)