01-JIJR-heat transfer characteristics of R410A-oil mixture in 7 mm microfin tube.pdf

下载文档

3
0
约5.04万字
约 13页
2017-04-13 发布于江苏
举报
版权申诉
保障服务

01-JIJR-heat transfer characteristics of R410A-oil mixture in 7 mm microfin tube.pdf

1、本文档共13页，可阅读全部内容。
2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。

01-JIJR-heat transfer characteristics of R410A-oil mixture in 7 mm microfin tube

i n t e r n a t i o n a l j o u r n a l o f r e f r i g e r a t i o n 3 1 ( 2 0 0 8 ) 1 0 8 1 – 1 0 9 3www. i ifi i r .org ava i lab le at www.sc iencedi rec t . com journa l homepage : www.e lsev i er . com/ loca te / i j r e f r igHeat transfer characteristics of R410A–oil mixture flow boiling inside a 7 mm straight microfin tubeHaitao Hua, Guoliang Dinga,*, Kaijian Wangb aInstitute of Refrigeration and Cryogenics, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China bFujitsu General Institute of Air-Conditioning Technology Limited, 1116 Suenaga, Takatsu-Ku, Kawasaki 213-8502, Japana r t i c l e i n f o Article history: Received 4 October 2007 Received in revised form 6 December 2007 Accepted 9 December 2007 Published online 15 December 2007 Keywords: Heat exchanger Microfin tube Heat transfer Boiling Mixture R410A Oil Heat transfer coefficient* Corresponding author. Tel.: t86 21 3420637 E-mail address: glding@ (G. Di 0140-7007/$ – see front matter a 2007 Elsevi doi:10.1016/j.ijrefrig.2007.12.004a b s t r a c t Two-phase heat transfer characteristics of R410A–oil mixture flow boiling inside a straight microfin tube with the outside diameter of 7.0 mm were investigated experimentally. The experimental conditions include the evaporation temperature of 5 C, the mass flux from 200 to 400 kg m2 s1, the heat flux from 7.56 to 15.12 kW m2, the inlet vapor quality from 0.2 to 0.7, and nominal oil concentration from 0 to 5%. The test results show that the heat transfer coefficient of R410A–oil mixture increases with mass flux of refriger- ant–oil mixture; the presence of oil enhances the heat transfer at the range of low vapor qualities (xr,o 0.4); while at high vapor qualities (xr,o 0.65), the presence of oil deterio- rates heat transfer, and the heat transfer coefficient drops off very sharply with the increase of nominal oil concentration and vapor quality at high vapor qualities. A new correlation to predict the local heat transfer coefficient