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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/69157

    Title: 使用不同擋板集管之多通道熱交換器流動分佈觀察;Visualization of Air-Water Two-Phase Flow Distribution in Multi-Plates Heat Exchanger at different header baffle configuration
    Authors: 江曜宏;Chiang,Yao-hung
    Contributors: 機械工程學系
    Keywords: 板式熱交換器;流動分布不均;流場可視化;擋板;Plate heat exchanger;mal-distribution;visualization;baffle
    Date: 2015-08-27
    Issue Date: 2015-09-23 15:30:25 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本研究利用透明板式熱交換器,使用空氣與水為工作流體,模擬冷媒在蒸發器入口的狀態,雷諾數範圍為50到250,用數位相機錄影的方式記錄不同擋板配置流動分布情況進行可視化觀察,實驗參數有不同擋板位置、不同擋板開口、熱交換器之入口處配置擋板和擋板與擋板間的間距大小。
    ;In this study, air-water two phase flow visualization experiment has been carried out using transparent acrylic plate heat exchanger to understand the flow distribution inside header and channels. The purpose is to simulate the refrigerant’s flow distribution inside evaporator using air-water as working fluid and improve the flow distribution by introducing the baffles. Experiments are carried out for Reynolds numbers ranging from 50 to 250 for two different baffle arrangement, namely, baffle on top and baffle on bottom of the header. Detailed studies on the effect of different baffle flow area ratio, header inlet flow area ratio, and baffle spacing are also carried out.
    The result shows that the insertion of baffle into the inlet of header has significant affect on flow distribution inside the plate heat exchanger without any header inlet flow area restriction. The baffle arrangement on upper half of the header showed uniform air-water mix in comparison to baffle arranged on bottom half of the header. So out of three different baffle flow area ratios (25%, 50% and 75%)at baffle arranged on upper half of header configuration, 25% and 50% flow area ratio significantly improved air-water mix compare to 75%. Between 25% and 50% flow area ratio, there is no significant difference in air-water mix has been observed. By restricting the flow at the entrance of header using baffle, the result showed significant improvement of air-water mix. Under restricted inlet flow condition, the baffle spacing on 5 channels, a uniform air-water flow distribution is achieved. But the pressure drop significantly increased.
    Appears in Collections:[機械工程研究所] 博碩士論文

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