Which of the following is least likely to decrease the thermal contact resistance between two media...

Which of the following is least likely to decrease the thermal contact resistance between two media in contact?

		Make a vacuum gap at the interface
		Apply thermal grease onto the interface
		Sand the contact surface smooth
		Apply pressure one against another

Expert Solution

Answer:

(A) Make a vacuum gap at the interface

Explanation:

(A) Vacuum gap or air gaps between two contact surfaces will INCREASE the thermal contact resistance because of less thermal conductivity of air. This creates an extra layer of low conductive material for the heat transfer or in other words increases the overall thermal resistance.

(B) Thermal grease increases the conductivity, hence it will very much likely to decrease the contact resistance

(C) Surface roughness tends to increase the contact resistance. Hence sanding the contact surface will decrease the contact resistance

(D) Applying pressure will increase the contact surface area and hence increase the thermal flow and therefore will definitely decrease the thermal resistance.

samet mamat answered 2 years ago

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