A cylindrical resistance heater is placed horizontally in air. The outer surface temperature of the resistance wire is to be determined. The environment temperature Tair = 40.0°C and the power of the resistance heater is 310.0W, The length and the diameter of the resistance heater is 0.75 m and 0.5 cm. Resistance Air heater, T, T. D=0.5 cm L = 0.75 m The properties of air at 1atm and 500°C are: k = 0.05572W - mª - K¯' v = 7.804 x 10 5m² ·s! Pr = 0.6986 в - 0.001204K- Hint: Start your guess from 1150.0°C. Nu = | 0.6 + 0.387RA 1+ 0599 Pr Iterate at least for 2 times.

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.