Abstract
This work presents an experimental study of lateral thermal dispersion in gas-liquid downflow through a packed bed for the cases of liquid flowing in the presence of a stagnant gas phase, and two-phase cocurrent flow. In the experiments, temperature profiles are generated by inducing a lateral step change in temperature at the entrance of the bed, which avoids wall heating. The evolution of the temperature profiles is determined by measuring radial temperature variations at various axial positions. The effect of variations of liquid viscosity with temperature are minimized by adjusting the viscosity of the liquid at the entrance of the bed so that it is approximately uniform despite temperature variations, thus avoiding the effect of viscosity changes on velocity or holdup profiles. The temperature profiles are employed to determine lateral effective thermal conductivities, and the effect of various independent variables on this parameter is investigated
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