Heat Transfer Video Lessons

Concept

Problem: Which of these actions would decrease heat transfer between two objects?a. increasing the temperature of the warmer objectb. increasing the area of their contactc. reducing the thermal energy of the cooler objectd. reducing the time of their contact

FREE Expert Solution

Conduction of heat is expressed as:

$\overline{){\mathbf{Q}}{\mathbf{=}}\frac{\mathbf{k}\mathbf{A}\mathbf{∆}\mathbf{T}\mathbf{t}}{\mathbf{L}}}$, where ΔT = Thot - Tcold

Increasing the temperature of the warmer object will increase the value of ΔT and hence higher heat transfer.

Option a. is incorrect.

If the area of their contact is increased, the rate of heat transfer will increase.

Therefore, option b. is incorrect.

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Problem Details

Which of these actions would decrease heat transfer between two objects?

a. increasing the temperature of the warmer object

b. increasing the area of their contact

c. reducing the thermal energy of the cooler object

d. reducing the time of their contact