Pressure and Temperature Effects on the Prediction of Heat Transfer Rates between Gas- Fluidized Beds and Immersed Surfaces

G. D. MAZZA AND G. F. BARRETO

Las Palmas de Gran Canaria, España

Congreso; FIRST EUROPEAN CONGRESS ON FLUIDIZATION; 1994

Universidad de Las Palmas de Gran Canaria

Different approaches to predict approximately heat transfer rate between gas fluidized bed and immersed surfaces are analyzed in this work. These approaches concern the gas and radiant ontributions which have been frequently accounted for by adding approximate terms to the usually main mechanism: transient conduction through the solid phase. A general model considering simultaneously the three mechanisms is presented and used to asses the validity of some previous approximations. Limits to the applicability of the approximations concerning operating pressure and temperature and particle size are established.