METHODS FOR CALCULATING RADIANT HEAT TRANSFER IN HIGH-TEMPERATURE HYDROGEN GAS

Autor:	Richard W. Patch
Rok vydání:	1961
Předmět:	Hydrogen Thermal radiation Chemistry Attenuation coefficient Diffusion Heat transfer Thermodynamics chemistry.chemical_element Heat transfer coefficient Mean radiant temperature Absorption (electromagnetic radiation) Computational physics
DOI:	10.21236/ad0273467
Popis:	A digital computer program was developed to determine heat transfer by thermal radiation in any gas with one-dimensional or axisymmetric temperature and pressure distributions. Heat transfer was calculated for a one-dimensional case with two black-body boundaries and a monotonically inceasing temperature. The calculations were me with hydrogen throughout the space between the boundaries and with a grey gas added to the hydrogen at the high-temperature end. Conclusions are as follows: (1) In gases the radiant heat flux densities determined by a diffusion analysis may be in error by several orders of magnitude for cases having steep temperature gradients and low absorption coefficients. (2) Accurate values of radiant heat flux density can be obtained for all cases by employing a transport analysis and using sufficiently small increments in the numerical integration procedure. (3) The use of a diffusion analysis for calculations where the absorption coefficient is high and a transport analysis where the absorption coefficient is low is the most practica method of solution for a general digital computer program. (4) The bound-free absorption of the H ion is the most important contributor to the absorpton coefficient of hydrogen at 100 atm between 6000 K and 12,000 K.
Databáze:	OpenAIRE
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