July 2013
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106 Reads
The present work is a theoretical study of the vaporization by direct contact of refrigerant drops and immiscible liquid. Refrigerant R12 were used for the dispersed phase, while water was the immiscible continuous phase. The analytical study has been used to investigate the variation of bubble radius, thickness of gas hydrate, Re, Nu, heat transfer coefficient, with different variable such as the time, column height, flow rate of the refrigerant, and temperature difference. The instantaneous heat transfer coefficient values seem to fall with the increase in temperature difference and/or the internal diameter of the vaporizing drops. The gas hydrate growth rate increased with time of hydrate formation increased with increasing dispersed phase mass velocity (a). The presence of surface-active sodium chloride in water had a strong inhibiting effect on the gas hydrate formation rate. The results of the present work are compared with other works, good agreement was achieved.