image (8.100)

Here, the starred quantities are evaluated at the reference temperature T* appropriate to the reference enthalpy h* discussed previously. Wilhite et al. (1984) point out that that the following regimes based on V′ appeared to apply:

• V′<0.007 corresponds to continuum flow

• 0.007<V′<0.07 corresponds to the viscous interaction regime

• 0.07<V′<5 corresponds to the transitional flow regime

• V′>5 corresponds to the free molecular flow regime

In particular, as V′ rises above 0.007, L/D tends to drop and other aerodynamic performances measures are similarly compromised.

The parameter M/Rel1/2 is shown as a function of M in Figure 8.38 ...

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