What is viscous dissipation?

Frictional drag

Loss of potential energy due to viscous effect

Increase in kinetic energy due to increase in temperature

Loss of kinetic energy due to viscous effect

Correct Answer : Loss of kinetic energy due to viscous effect

Explanation : When a very high velocity flow is over a body, the hypersonic flow has large amounts of kinetic energy. This is often dissipated and converted in the form of internal energy die to viscous effects within the boundary layer. This effect is known as the viscous effect.

Recently Updated in Aerodynamics Questions

Why is hypersonic similarity parameter essential?

Hypersonic flow over cone

Supersonic flow over wedges

Hypersonic flow over slender bodies

Hypersonic flow over flat plate

Correct Answer : Option (C) : Hypersonic flow over slender bodies

Explanation : Hypersonic similarity parameter K is an important governing parameter in order to study the hypersonic flow i.e. flow with Mach number greater than 5 over slender bodies. It is given by the product of free stream Mach number and flow deflection angle.

For two bodies with same shape but different scales, which of these parameters must be equal for the flow to be same in hypersonic regime?

Mach number

Normal flow velocity

Tangential flow velocity

Product of Mach number and slenderness ratio

Correct Answer : Option (D) : Product of Mach number and slenderness ratio

Explaination : The product of Mach number and slenderness ratio along with gamma are the two parameters which appear in the non – dimensional equations. For a body that has same shape but have different scale ratio, if these parameters are same, the flow over them at hypersonic regime remain same. This is the physical meaning of the hypersonic similarity parameter.