A long cylinder of solid aluminium 7.5 cm in diameter initially at a uniform temperature of 5°C, is hung in an air blast at 100°C. If it is found that the temperature at the centre of the cylinder rises to 47.5°C after a time of 850 seconds, estimate the surface heat transfer coefficient from the cylinder to the air.
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Two surfaces of a plane wall of 15cm thickness and 5 m2 area are maintained at 240°C and 90°C respectively. Determine the heat transfer between the surfaces and temperature gradient across the wall if conductivity of the wall material is18.5 W/(m-K)
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A gas al 450 K is flowing inside a 2-in. sicel pipe, schedule 40. The pipe is insulated with 51 mm of lagging having a mean k=0.0623 W/m. K. The convective heat-transfer cofficient of the gas inside the pipe is 30.7 W/ m K and the convective coellicient on the outside of the lagging is 10.8. The air is at a temperature of 300 K. (a) Calculate the heat loss per unit length of 1 m of pipe using resistances. (b) Repeat using the overall U, based on the outside area 4,
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Air at a pressure of 101.3 kPa and a temperature of 288.8 K is flowing over a thin, smooth fat plate at 3.05 m/s. The plate length in the direction of low is 0.305 m and is at 333.2 K. Calculate the heat-transfer coelficient assuming laminar flow.
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Air is flowing through a tube having an inside diameter of 38.1 mm at a velocity of 6.71 m/s, heat-transfer coellicient for a long tube and the hea transfer flux. The inside wall temperature is held constant at 204.4°C (477.6 K) by sicam condensing outside the tube wall. Calculate the heat-transfer coellicient for a long tube and the hea transfer flux.
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