Abstract
This paper is a study of a direct contact heat exchanger with a liquid-solid transition. The experiments were carried out on two systems at different working temperatures: Hitec/oil (at 140°C) paradichlorobenzene/water (at 50°C). The particle size distribution at the exchanger column outlet is a function of dispersed-phase and continuous-phase temperatures as well as of the relative velocity of the two fluids at the nozzle. We have established a model based on the heat transfer characteristic times: There is a correlation between the heat exchanger efficiency to the characteristic Peclet number of this type of heat exchangers. We established another model of the heat transfer inside the two-phase flow, giving the temperature profile of the continuous phase along the exchange column and the efficiency of the heat exchange. The results of this model were compared to those obtained experimentally.
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