Modification of heat transfer correlations in a liquid–solid fluidized bed heat exchanger with cylindrical particles in aggregative fluidization

Abstract

Most correlations presented for the heat transfer coefficient of liquid–solid fluidized bed heat exchangers are based on experiments with glass bead particles in particulate fluidization which usually under-predict the heat transfer coefficient. The present study used experimental data from previous studies for the heat transfer coefficient in liquid–solid fluidized bed heating systems using cylindrical metal particles and five heat transfer correlations based on experiments with spherical glass beads to approximate the behavior of the cylindrical metal particles under aggregative conditions. The results show that modifying the correlations significantly improved the prediction of heat transfer coefficients and the average relative error decreased in comparison with those for the original correlations.