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SAND Report: SAND89-2294, November 1989
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Library's review
ABSTRACT:
This is a dissertation that was submitted to the Graduate School of New Mexico State University in partial fulfillment of the requirements for the degree of doctor of philosophy. It reports that radiative transfer in combined mode heat transfer problems was investigated with emphasis on
This is a dissertation that was submitted to the Graduate School of New Mexico State University in partial fulfillment of the requirements for the degree of doctor of philosophy. It reports that radiative transfer in combined mode heat transfer problems was investigated with emphasis on
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the analysis and characterization of a free-falling particle cloud, direct absorption solar central receiver. A model was developed to calculate the relevant distributions in the curtain while a concentrated solar beam is impinging on the front face of the medium. The discrete ordinates approximation was applied to allow the spectral equation of transfer to be modeled as a PDE. Model verification tests were conducted to determine the accuracy of the model. One- and two-dimensional results showed that the discrete ordinates model provides satisfactory estimates of the radiant intensity, the heat flux and the temperature distributions for ordinate sets above S4 (12-flux approximation) for both the black and gray cases. An experimental program was conducted to measure the unknown thermal and radiative properties of a typical particle curtain and to obtain data on receiver performance for comparison with the model. Indications are that the model performs satisfactorily for the higher order sets and that, when applied to a full-scale receiver, reasonably small errors can be expected. Show Less