| Summary: | 碩士 === 國立中央大學 === 能源工程研究所 === 99 === When the plate heat exchanger as the evaporator, entrance two phases refrigerant because of the action of gravity that causes refrigerant flow mal-distribution in a channel. In order to reduce this phenomenon, at present is more than install inlet port distributor in the entrance, but distributor''s opening direction will affect refrigerant flow distribution in a channel.
In this research an experimental study to visualize water with dye (single phase flow) and water-air flow (two phases flow)distribution in the plate heat exchanger that in order to find the optimum distributor''s opening direction.
From dye visualization results, the flow rate nears entrance and export ports are higher than that of in the middle of place. In the middle of plate, the flow is uniformly distributed in different Reynolds number.
From water-air flow visualization results, the flow distribution will be more uniform when void fraction and Reynolds number increase. And know that the optimum distributor''s opening direction should be 3, 4, 5or 6 in void fraction is 0.77.
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