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How does viscous dissipation affect temperature inside the boundary layer?

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How does viscous dissipation affect temperature inside the boundary layer?

(a) Increases

(b) Decreases

(c) No change

(d) First increases, then decreases

I got this question during an online exam.

This interesting question is from Hypersonic Flow in division Transonic and Hypersonic Flows of Aerodynamics

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Correct choice is (a) Increases

Explanation: Due to viscous dissipation, kinetic energy of the gas gets converted to the internal energy leading to rise in temperature inside the boundary layer. With increase in temperature, the viscosity coefficient also increases.

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