The local heat transfer mathematical model between vibrated fluidized beds and horizontal tubes

A dimensionless mathematical model is proposed to predict the local heat transfer coefficients between vibrated fluidized beds and immersed horizontal tubes, and the effects of the thickness of gas film and the contact time of particle packets are well considered. Experiments using the glass beads (the average diameter (d) over bar (p) = 1.83 mm) were conducted in a two-dimensional vibrated fluidized bed (240 trim x 80 mm). The local heat transfer law between vibrated fluidized bed and horizontal tube surface has been investigated. The results show that the values of theoretical prediction are in good agreement with experimental data, so the model is able to predict the local heat transfer coefficients between vibrated fluidized beds and immersed horizontal tubes reasonably well, and the error is in range of +/- 15%. The results can provide references for future designing and researching on the vibrated fluidized beds with immersed horizontal tubes. (c) 2008 Elsevier Inc. All rights reserved.