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A theoretical study is conducted to characterize the radiative component of heat transfer to a cooled surface in a gas-fluidized bed combustor. Specifically, the effective emissivity of a fluidized bed is predicted theoretically by using the two-flux model of radiative transfer theory and compared with experimental results. A gray nonisothermal model with a simple closed-form analytical solution is found to correlate with experimental measurements. The model assumes an exponential profile near the wall. Experimental measurements of particle temperatures near a cooled wall are also reported. For the range of parameters tested the ratio of wall temperature to particle temperature at the wall varied from 0. 75 to 0. 9 with a tendency to increase with increasing value of wall to bulk bed temperature ratio. The ratio of non-isothermal layer thickness to particle diameter varied between 1. 5 and 7. 0 with a tendency to increase with increasing bulk bed temperature.

Original languageEnglish (US)
Pages (from-to)7-14
Number of pages8
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
StatePublished - 1984
Externally publishedYes

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering


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