Experimental study of convective heat transfer of R32/R134a inside horizontal microfin tubes
Experimental study is reported for heat transfer in forced convective boiling of a nonazeotropic mixture of R32/R134a (25%Wt/75%Wt) inside both smooth and microfin tubes with internal spiral grooves. The experimental results show that the microfin tubes have distinct performance advantages over the...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2003-01-01
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| Series: | Zhileng xuebao |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2003.01.004 |
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| Summary: | Experimental study is reported for heat transfer in forced convective boiling of a nonazeotropic mixture of R32/R134a (25%Wt/75%Wt) inside both smooth and microfin tubes with internal spiral grooves. The experimental results show that the microfin tubes have distinct performance advantages over the smooth tube at similar conditions. Considerating the interaction effects among nucleation sites, secondary flow and capillary promotion, this paper describes the enhanced mechanism for the microfin tubes, and the circumferential wall temperature variation of R32/R134a in the annular flow regime was observed and analyzed for both smooth and microfin tubes, which caused by the composition concentration variation, gravity and secondary flow. |
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| ISSN: | 0253-4339 |