In a production facility, 3 cm thick large brass plates (k = 110 W/mC, α = 33.9 × 10-6 m2 /s) that are initially at a uniform temperature Ti = 25C are heated by passing through an oven maintained at 700C. The plates remain in the oven for a period of 10 minutes. The average heat transfer coefficient in the oven h = 80 W/m2 C. Determine the surface temperature (C) of the plates when they come out of the oven

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)