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A general stagnation-point convective heating equation for arbitrary gas mixturesThe stagnation-point convective heat transfer to an axisymmetric blunt body for arbitrary gases in chemical equilibrium was investigated. The gases considered were base gases of nitrogen, oxygen, hydrogen, helium, neon, argon, carbon dioxide, ammonia, and methane and 22 gas mixtures composed of the base gases. Enthalpies ranged from 2.3 to 116.2 MJ/kg, pressures ranged from 0.001 to 100 atmospheres, and the wall temperatures were 300 and 1111 K. A general equation for the stagnation-point convective heat transfer in base gases and gas mixtures was derived and is a function of the mass fraction, the molecular weight, and a transport parameter of the base gases. The relation compares well with present boundary-layer computer results and with other analytical and experimental results. In addition, the analysis verified that the convective heat transfer in gas mixtures can be determined from a summation relation involving the heat transfer coefficients of the base gases. The basic technique developed for the prediction of stagnation-point convective heating to an axisymmetric blunt body could be applied to other heat transfer problems.
Document ID
19720003329
Document Type
Other - NASA Technical Report (TR)
Authors
Sutton, K. (NASA Langley Research Center Hampton, VA, United States)
Graves, R. A., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 2, 2013
Publication Date
November 1, 1971
Subject Category
THERMODYNAMICS AND COMBUSTION
Report/Patent Number
NASA-TR-R-376
L-7885
Funding Number(s)
PROJECT: RTOP 117-07-01-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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