Stagnation temperature in free molecular flow

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 July 29, 2004, 05:53 Stagnation temperature in free molecular flow #1 Anton Lyaskin Guest   Posts: n/a I have may be a stupid question - what's the meening of stagnation temperature in free molecular (and also transitional) flow? Can ve calculate it the same way as in continuum flow, i.e. T_stag=T_inf+V_inf^2/(2*Cp)? If yes, than which value of Cp we should take? I guess for air Cp at high altitudues (100..200 km, where we can expect free molecular flow) is different from usual 1006 J/kg/K?

 July 29, 2004, 10:54 Re: Stagnation temperature in free molecular flow #2 Angen Guest   Posts: n/a I think the stagnation temperature does not make sense in free molecular flow where a size of object (e.g. satelite) is much less than the molecular mean free path. There is always a sleep velocity between fluid and an object. Angen

 July 30, 2004, 09:09 Re: Stagnation temperature in free molecular flow #3 Anton Lyaskin Guest   Posts: n/a Yes, that's what makes me curious! But in DSMC codes and papers (like ones of Bird) the dimensionless wall temperature is expressed in terms of flow and temperature and stagnation temperature! So I wonder what does this stagnation temperature meens.

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