TY - JOUR
TI - Experimental study of the convective heat transfer coefficient in a packed bed at low Reynolds numbers
AU - Messai Souad
AU - El Ganaoui Mohammed
AU - Sghaier Jalila
AU - Belghith Ali
JN - Thermal Science
PY - 2014
VL - 18
IS - 2
SP - 443
EP - 450
PT - Article
AB - An experimental study to evaluate the convective heat transfer coefficient in  a cylindrical packed bed of spherical porous alumina particles is  investigated. The task consists in proposing a semi-empirical model to avoid  excessive instrumentation and time consumption. The measurement of the bed  temperature associated to a simple energy balances led to calculate the gas  to particle heat transfer coefficient using a logarithmic mean temperature  difference method. These experiments were performed at atmospheric pressure.  The operating fluid is humid air. The gas velocity and temperature ranged  from 1.7-3 m/s and 120-158°C, respectively. The data obtained was compared  with the correlations reported in the literature. It is shown that the  proposed model is in reasonable agreement with the correlation of Ranz and  Marshall. Despite, many researches on experimental investigations of heat  transfer coefficient in packed beds at low and average temperature are  proposed, few studies presented calculation of convective heat transfer  coefficient at high temperature (above 120°C). A possible application of the  proposed model is drying and combustion.