An aluminum alloy sphere 10cm in diameter has a uniform temperature of 200°C after being removed from a hot oven. The aluminum sphere is then left in a cold room of 15°C and being blown by forced air. The convection heat transfer coefficient from the air flow is assumed to be h = 500 W/m²K Use the following properties to solve the problem: k = 163 W/mK, p = 2810 kg/m³, Cp = 880J/kg°C. a. Using Lump Model, determine the temperature of the sphere after 2 minutes. b. Determine the required convective heat transfer (h) to cool the sphere from 200°C to 80°C in 3 minutes.

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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.