Experimental study of heat transfer in the surrounding for bubble attached at the upper cooled surface of square cavity using the Thermo-sensitive Liquid-crystal Tracer

열감응액정을 이용한 사각공동내의 상단냉각평판에 형성된 기포 주위의 열전달현상 구명

In a square cavity, the flow phenomena in the surrounding of the bubble attached at the upper cooled solid wall were studied by using a thermo-sensitive liquid-crystal tracer and image processing techniques. This method offers the advantage of measuring the entire flow field in a selected plane within the fluid at a given instant of time in contrast to point by point method like T/C. Quantitative data of the temperature were obtained by applying a colour-image-processing to the. visualized image. As the growing of a bubble, In a bubble size appears the flow phenomena which the direction of flow is reversed in the entire temperature and flow field. The observed phenomena are described with regard to thermocapillary convection.