Numerical investigation on heat transfer of liquid–solid two-phase flow in vertical multi-tube circulating fluidized bed heat exchanger

Abstract

A new correlation for the heat transfer of liquid–solid two-phase flow is established and validated. The numerical investigation on the heat transfer of liquid–solid two-phase flow in an up-flow multi-tube circulating fluidized bed heat exchanger is performed by hooking the new correlation to the corresponding computational domain. Operational conditions are optimized by examining the effects of the operating parameters on the heat transfer enhancing factors of the particles including SiC particles, glass bead and POM particles. The results indicate that the amount of added particles and wall temperature are more important to enhance heat transfer than inlet velocity. The enhancing factor of SiC particle is superior to those of the other particles due to great collision intensity with the wall. The enhancing factors of POM particles are significantly raised at the great amount of added particles of 3% and the high wall temperature of 360 K.