| Description |
x, 89 leaves : illustrations ; 29 cm |
| Summary |
"The radiative transfer through an absorbing-emitting gas shell contained within black concentric spheres at uniform but different temperatures was investigated. A close form exact solution and an approximate solution were derived for the case of isothermal gas layer. The two solutions appear to compare well specially at low diameter ratios, and both agree with the radiative equilibrium solution in the thin limit. An approximate method was developed for the radiative equilibrium, non-isothermal gas layer, of the above problem. The method is based on the assumption of a hyperbolic emissive power distribution through the gas shell. The jump boundary conditions were applied to calculate the constant coefficients. The results of this approximate method compare very well with the exact radiative equilibrium solution. The combined problem of radiative and convective energy transfer between two concentric spheres was investigated experimentally. Helium was used as a non-participating gas to evaluate the natural convection contribution. The results compare favorably with the predicted values specially at higher pressures. Carbon dioxide was used to evaluate the radiation contribution. The sum of the predicted natural convection and radiation was within 11 percent of the experimental results"--Abstract leaves ii-iii. |
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