A simplified model of heat transfer between large-particle gas-fluidized beds and immersed surfaces Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bc386m564

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  • A simplified model of the combined particle convective and radiative components of heat transfer between large-particle gas-fluidized beds and immersed surfaces was developed. This analytical model was based on the single particle formulation of Adams and Welty [4,9], with the added assumptions of one-dimensional heat conduction in the particle and its adjacent Stokes-like gas layer and linearized particle surface boundary conditions. The simplified model was found to closely predict the results of the complete Adams-Welty model in the range of particle size and fluidization conditions under which the latter model had been verified experimentally. Direct experimental verification was also obtained by comparison of model predictions with heat transfer coefficients measured in flowing packed beds. An extension of the model was then made to calculate heat transfer coefficients in fluidized beds of mixed particle size. According to this extended model, the use of a single average particle radius to represent a distribution of radii in heat transfer calculations was found to cause slight (~ 10 percent) inflation of the results. Experimental confirmation of the extended model was hampered by a lack of any systematic laboratory study on mixed size fluidized beds in the large particle (> 1 mm) range. Hence, definitive answers regarding the validity of estimating heat transfer coefficients from conventionally determined average particle radii in mixed size fluidized beds cannot presently be given.
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