1. Determine the hydrodynamic and thermal boundary layer thicknesses at 0.5 m from the leading edge of a flat plate at 74°C for flow at 80°C and atmospheric pressure with a velocity of 3 m/s of air,...

1. Determine the hydrodynamic and thermal boundary layer thicknesses at 0.5 m from the leading edge of a flat plate at 74°C for flow at 80°C and atmospheric pressure with a velocity of 3 m/s of air, hydrogen and helium, respectively. Compare the ratio
.

2. Engine oil at 40°C flows with a velocity of 1 m/s over a 2 m long flat plate whose surface is maintained at a uniform temperature of 80°C. Determine the average heat transfer coefficient.