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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

A computational and experimental study of the wall-to-bed heat transfer in a gas-solid bubbling fluidized bed

Get access (open in a dialog) DOI: 10.1615/IHTC12.4490
6 pages

Sinopsis

The wall-to-bed heat transfer in gas-solid fluidized beds is mainly determined by phenomena prevailing in the "thermal boundary layer" with a thickness of the order of magnitude of one particle diameter. The temperature gradients are steep in this thermal boundary layer. A numerical model based on the conservation laws for mass, momentum and thermal energy has been developed taking into account the porosity distribution near the wall, as proposed by Martin (1978). Local instantaneous heat transfer coefficients (HTC) were measured along a heated wall kept at constant temperature in the fluidized bed. The incorporation of porosity profiles has improved the prediction of the HTC remarkably. The predicted local instantaneous HTC is in good agreement with the experimental data provided profile that near wall porosity is accounted for.