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Boiler tubes exposed to the products of coal combustion in a power plant are subject to fouling by the ash (min- eral) content of the combustion gas. The ash forms a solid deposit on the tube outer surface, which reduces heat transfer to a pressurized water/steam mixture flowing through the tubes. Consider a thin-walled boiler tube (Dt = 0.05 m) whose surface is maintained at Tt = 600 K by the boiling process. Combustion gases flowing over the tube at Too = 1800 K provide a convection coefficient of h = 100 W/m2 · K, while radiation from the gas and boiler walls to the tube may be approximated as that originating from large surroundings at Tsur = 1500 K.
Explore the effect of variations in Dd and h on q', as well as on relative contributions of convection and radiation to the net heat transfer rate. Represent your results graphically.
compressive centric forces of 30 kips are applied at both ends of the assembly shown by means of rigid end plates.
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Determine a symbolic expression for the total thermal resistance of wall, including inside and outside convection effects for prescribed conditions.
10 kJ of heat enters a piston-cylinder. The internal energy of the piston-cylinder increases by 2 kJ. How much work is produced by the piston-cylinder?
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