A stainless steel rod (AISI 304) of length L = 100 mm and triangular cross section is attached between two isothermal heat sinks at T(x = 0) = T(x = L) = 50°C. The rod perimeter is P = 4.25 mm. When an unknown fluid at T = 23°C is in cross flow over the rod, the temperature of the rod midway between its two ends is measured to be T(x = 0.5L) = 25°C. Determine the value of the convection heat transfer coefficient, in W/m2.K, and the rate of heat loss from the rod, in W. Evaluate the properties of the stainless steel at T = 310 K. h W/m².K W

A thick concrete wall having a uniform temperature of 50oC is suddenly subjected to a stream of water so that the surface temperature is suddenly lowered to 15oC. How long will it take to cool the concrete to 30oC at a depth of 5 cm from the surface? Data: concrete properties, k = 1.37 W/m×oC, r = 2100 kg/m3, a = 7.5×10-7 m2/s.

A vertical pipe 90 mm diameter and 2.5 m height is maintained at a constant temperature of 125 o The pipe is surrounded by still                atmospheric air at 25 oC. Find heat loss by natural convection.             Properties of water at 75 oC:             Density = 1.0145 kg/m3             Kinematic viscosity = 20.55 x10-6 m2/s             Prandtl number (Pr) = 0.693             Thermal conductivity (k) = 30.06 x 10–3 W/m K

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