A heated vertical wall 0.305 m high of an oven for baking food with the surface 505.4 K is in contact with air at 311 K. Calculate the heat transfer coefficient and the heat transfer per unit length  of the wall. The properties of air at film temperature is: k= 0.0343 W/m-K,  ρ= 0.867 kg/m3, Pr=0.690, µ= 2.32 x 10-5 Pa.s.

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