TED-AJ03-308 SOLID/LIQUID PHASE CHANGE HEAT TRANSFER OF A LOW CONCENTRATION AQUEOUS SOLUTION AROUND HORIZONTAL CYLINDER (S) IN A RECTANGULAR CAVITY

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The use of a low concentration aqueous solution (e.g. aqueous ethylene glycol), instead of pure water that is conventionally used as phase change material (PCM), has a possibility to reduce the size of the ice storage vessels by around 30%. In the present study, a numerical model has been constructed to simulate the solidification of a low concentration aqueous solution around one or two cylinder (s) in a rectangular cavity. Comparing numerically obtained solidification rate, temperature distributions, and interface shapes with experimental data, the validity of the present numerical model has been checked. The effects of the initial concentration of the solution, the initial temperature of the solution, and the number and spacing of the cylinders on solidification process have been numerically examined. From the numerical result, the concentration and liquid-mass-fraction distributions in the mush, which are very difficult to be obtained by experiments, have been obtained, and the physical meanings of timewise variations of the solidification rate under different conditions have been clarified. As a result, it was found that when the initial temperature became high, the growth of the solidification layers became slow but the diffusion of mass developed fast. For the case of two cylinders, the growth of the solidification layers was quick and prevailed over the diffusion of mass, so that the solute of the comparatively high concentration is left among the cylinders. The concentration fields were significantly affected by convection, but the temperature fields were not. The solute of the comparatively high concentration was accumulated near the cylinder, so that the growth of the solidification layers became slow.[figure]
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TED-AJ03-308 SOLID/LIQUID PHASE CHANGE HEAT TRANSFER OF A LOW CONCENTRATION AQUEOUS SOLUTION AROUND HORIZONTAL CYLINDER (S) IN A RECTANGULAR CAVITY

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