An experiment was conducted to measure thermal  conductivity of a formulated food. The measurement was  made by using a large plane plate of the food material, which  was 5 mm thick. It was found, under steady-state conditions, that when a temperature difference of 35°C was maintained  between the two surfaces of the plate, a heat-transfer rate per  unit area of 4700 W/m 2 was measured near the center of either  surface. Calculate the thermal conductivity of the product, and  list two assumptions used in obtaining the result.

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Q: Example 1 A 15 mm diameter and 5 m long electric wire is tightly wrapped with 2 mm thick plastic…

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A: Solution:

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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.