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1. Consider atmospheric air at 25°C and a velocity of 25 m/s flowing over both surfaces of a 1-m-long flat plate that is maintained at 125°C. Determine the rate of heat transfer per unit width from the plate for values of the critical Reynolds number corresponding to 105, 5 X 105, and 106.
2. Consider laminar, parallel flow past an isothermal flat plate of length L, providing an average heat transfer coefficient of hL. If the plate is divided into N smaller plates, each of length LN = L/N, determine an expres- sion for the ratio of the heat transfer coefficient aver- aged over the N plates to the heat transfer coefficient averaged over the single plate, hL,N /hL,1.
air at 1 atm and 25 ordmc occupies an initial volume of 1200 cm3 in a cylinder. the air is confined by a piston which
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Air is heated in an adiabatic piston cylinder device at a constant pressure of 100 kPa. The initial specific volume of air is 1 m3/kg. If the volume of the cylinder is increased by 50% in this process, determine the specific entropy change of air in ..
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