表面浮遊法を用いた熱交換器フィン内部の流れの可視化

抄録

Recent advancement of technology.need the compactness of heat exchanger to be used in the air conditioner without lowering it's overall performance. It is well known that the performance of heat exchanger can be improved by introducing slits on the fin. However, the important problem here, is to choose the best possible slit pattern. In order to study the above mentioned problem, in the present work, experiment is carried out by using 10 times enlarged model fins of heat exchanger for flow visualization.
Results indicate fully developed laminar flow pattern in the case of flat parallel plate. In the case of alternative arrangement of the slits, it is observed that the flow is symmetrical downstream the second stage of alternative slit pattern. Comparison of the experimental flow pattern with the calculated heat transfer coefficient lead to the understanding that downstream the second stage, if slits are arranged in such a way that the flow interact with the slits in the portion where the flow velocity is high, it is possible to increase the heat transfer coefficient.