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Stagnation temperature in free molecular flow

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Old   July 29, 2004, 05:53
Default Stagnation temperature in free molecular flow
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Anton Lyaskin
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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?
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Old   July 29, 2004, 10:54
Default Re: Stagnation temperature in free molecular flow
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Angen
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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
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Old   July 30, 2004, 09:09
Default Re: Stagnation temperature in free molecular flow
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Anton Lyaskin
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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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