不同型式分佈器對多流道熱交換器流動分佈之影響

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/77952

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/77952

Title:	不同型式分佈器對多流道熱交換器流動分佈之影響
Authors:	廖威凱;Liao, Wei-Kai
Contributors:	機械工程學系
Keywords:	板式熱交換器;分佈不均;擋板;可視化;Plate heat exchanger;mal-distribution;baffle;visualization
Date:	2018-08-21
Issue Date:	2018-08-31 15:05:19 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究利用透明板式熱交換器，以水和空氣為工作流體，模擬冷媒在蒸發器入口時之狀態，利用攝影機拍攝進行可視化，觀察不同條件下的流動分佈現象，實驗參數包括不同雷諾數、不同分佈器。實驗結果得知入口集管內部的流譜對流動分佈有明顯的影響，隨著雷諾數增加，入口流譜從塊狀流轉為環狀流，空氣可以分佈到較遠的流道。使用水平分佈器可以增加器泡在流道的速度，環狀流中心的空氣會沿著分佈器板片往後流動，後半部流道空氣分佈較無分佈器的多，氣體整體分佈更均勻。 ;In this study, acrylic plate heat exchanger is used as test section to visualize flow distribution. The purpose is to simulate the refrigerant’s flow distribution inside the evaporator using air-water as working fluid and improve the flow distribution by insert the baffles. The experiment has been test with Reynolds number from 50 to 250, different distributor. The results show that there is significant effect on flow distribution with inlet flow pattern. When the Reynolds number increases, the inlet flow pattern transform from slug flow to annular flow. Air can reach to the rear part of the test section. Using horizontal divider can increase the bubble velocity inside the channel, the air in center of annular flow would flow into rear part through the plate of divider, and the air flow distribution is more uniform.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	217	View/Open

社群 sharing

Loading...