Experimental study on heat transfer characteristics of R134a flow boiling in “Ω”-shaped grooved tube with different flow directions

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• 作者：Wen-Long Cheng^a ; ^{wlcheng515@163.com} ; Hua Chen^a ; Shuai Yuan^a ; Qi Zhong^b ; ^c ; Yu-Feng Fan^b
• 关键词：Flow boiling ; Heat transfer enhancement ; &ldquo ; Ω&rdquo ; shaped groove ; Flow direction ; Two phase flow
• 刊名：International Journal of Heat and Mass Transfer
• 出版年：2017
• 出版时间：May 2017
• 年：2017
• 卷：108
• 期：part_PA
• 页码：988-997
• 全文大小：1979 K
• 卷排序：108

文摘

Flow boiling experiment in “Ω”-shaped grooved tube with R134a was conducted. Heat transfer coefficient was enhanced 1.5–3.3 times than smooth tube. Effect mechanism of gravity on grooved tube was quite different from smooth tube. Downward flow showed highest heat transfer and horizontal flow showed the lowest. Dominant boiling heat transfer was different in different flow direction.