TED-AJ03-312 NATURAL CONVECTION IN AN ENCLOSURE CONTAINING TWO IMMISCIBLE LIQUID LAYERS HEATED AND COOLED FROM OPPOSING VERTICAL WALLS

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Natural convection in an enclosure containing two immiscible liquid layers has been investigated in this study. Natural convections in the superposed immiscible layers have interested many researchers. Most of previous numerical and experimental studies assumed that the interface between the layers was horizontal and flat. On the other hand, recent numerical works predicted the deformation of the interface although an experimental evidence for the deformation has not been provided. The purpose of the present study is to clarify the deformation of the interface and to investigate flow and heat transfer characteristics with and without the deformation of the interface experimentally. Water and silicone oils, which have different physical properties, were used as working fluids. The dimensions of the enclosure were 30mm in height and width and 100mm in depth. Fluids of two layers were heated and cooled from the opposing vertical walls of the enclosure. A heat flux sensor was equipped at the heating wall and mean Nusselt numbers were measured. Temperature [figure] distributions in the layers were measured with a traversing thermocouple. Flow was visualized with nylon particles (a mean diameter is 4.15 micron) and velocity fields were measured with a PIV system. The shape of the interface between the layers was observed. It was shown that the interface inclined depending on the conditions and that the inclination angle of the interface increased as the density difference between two fluids decreased. Figure A-1 shows the example of the inclined interface between two layers of silicone oil. This deformation of the interface was also apparent in velocity field measured using a PIV. Figure A-2 shows Nusselt number for single layer and two layers systems. Nusselt number for two layer systems could be predicted approximately from those for single layer as indicated by Sparrow et al. (1986) though measured Nusselt number was smaller than the predicted value. Marangoni effect at the interface between the two layers has negligible effect on heat transfer characteristics under the present conditions. [figure]
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TED-AJ03-312 NATURAL CONVECTION IN AN ENCLOSURE CONTAINING TWO IMMISCIBLE LIQUID LAYERS HEATED AND COOLED FROM OPPOSING VERTICAL WALLS

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