Hypersonic boundary layers grow more rapidly compared to subsonic and supersonic boundary layers.

Hypersonic boundary layers grow more rapidly compared to subsonic and supersonic boundary layers. Correct Answer True

The pressure inside the boundary layer remains constant (in the normal direction), but the temperature increases due to viscous dissipation. Thus, from equation of state, there is a decrease in density making it important to have a larger boundary layer thickness to pass the mass flow through the boundary layer. Due to this reason, the hypersonic boundary layer thickness grows much more rapidly compared to other flow regimes.
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