2.11 Consider steady-state conditions for one-dimensional conduction in a plane wall having a thermal conductiv- ity k = 50 W/m-K and a thickness L = 0.25 m, with no internal heat generation. T₁ Case 1 2 3 4 5 Lx L Determine the heat flux and the unknown quantity for each case and sketch the temperature distribution, indi- cating the direction of the heat flux. -T₂ T,(°C) 50 -30 70 T₂(°C) -20 -10 40 30 dT/dx (k/m) 160 -80 200

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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.