Heat transfer between immersed horizontal tubes and aerated vibrated fluidized beds

Neat transfer coefficients between an immersed horizontal tube and an aerat ed vibrated fluidized bed are measured. There is a maximum value in the h-G amma experimental curve. The heat transfer coefficient increases with decre ases in particle diameter in the fully fluidized region. The particle densi ty has less effect on the heat transfer coefficients. High amplitude and lo w frequency, or low amplitude and high frequency are favorable to heat tran sfer. Exceedingly high gas velocity is unfavorable to the surface-bed heat transfer. A model based on the 'pocket' theory was proposed for predicting the surface-to-bed heat transfer coefficients in fully fluidized region. Th e predictions from the model were compared with observed data. The reasonab le fit suggests the adequacy of the model.