1.0-mm-diameter wire is maintained at a temperature of 400°C and exposed to a convection environment at 40"C with h=120 W/m. "C. Calculate the thermal conductivity that will just cause an insulation thickness of 0.2 mm to produce a critical radius." How much of this insulation must be added to reduce the heat transfer by 75 percent from that which would be experienced by the bare wire

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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.