Experiment on Boiling Heat Transfer of Refrigerant R134a in Mini-channels

被引：0

作者：

ZHAN Hongbo ^{[1
]}

SHEN Hao ^{[2
]}

WEN Tao ^{[1
]}

ZHANG Dalin ^{[1
]}

机构：

[1] College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics

[2] Shanghai Aircraft Airworthiness Certification Center of CAAC

来源：

Transactions of Nanjing University of Aeronautics and Astronautics | 2019年 / 36卷 / 01期

关键词：

flow boiling; heat transfer; two-phase flow; refrigerant R134a; channels with offset fins; multi-port channel;

D O I：

10.16356/j.1005-1120.2019.01.007

中图分类号：

TK124 [传热学]; V245.3 [环境控制设备];

学科分类号：

080701 ; 082504 ;

摘要：

The flow boiling heat transfer characteristics of refrigerant R134 a flowing inside two different kinds of minichannels are investigated. One channel is multi-port extruded with the hydraulic diameter of 0.63 mm,and the other one is rectangular with offset fins and a hydraulic diameter of 1.28 mm. The experiments are performed with a mass flow rate between 68 and 630 kg/(m2·s),a heat flux between 9 and 64 kW/m2,and a saturation pressure between 0.24 and 0.63 MPa,under the constant heat flux heating mode. It is found that the effect of mass flow rate on boiling heat transfer is related to heat flux,and that with the increase of heat flux,the effect can only be efficient in higher vapor quality region. The effects of heat flux and saturation pressure on boiling heat transfer are related to a threshold vapor quality,and the value will gradually decrease with the increase of heat flux or saturation pressure. Based on these analyses,a new correlation is proposed to predict the boiling heat transfer coefficient of refrigerant R134 a in the mini-channels under the experimental conditions.

引用

页码：80 / 87

页数：8

共 16 条

[1] Experiment on Spray Cooling Performance with Different Additives of Different Mass Fraction
Wang Yu
Zhou Nianyong
Qian Xiaohui
Jiang Yanlong
[J]. TransactionsofNanjingUniversityofAeronauticsandAstronautics, 2016, 33 (03) : 375 - 385
[2] R134a在多孔扁管内沸腾换热试验研究
詹宏波
张大林
陈维建
[J]. 南京航空航天大学学报, 2013, 45 (06) : 797 - 801
[3] Experimental study on flow boiling heat transfer of multiport tubes with R245fa and R1234ze（E）[J] . F. Vakili-Farahani,B. Agostini,J.R. Thome.International Journal of Refrigeration . 2012
[4] Experimental investigation on two-phase flow boiling heat transfer of five refrigerants in horizontal small tubes of 0.5, 1.5 and 3.0＜ce:hsp sp="0.25"/＞mm inner diameters[J] . Jong-Taek Oh,A.S. Pamitran,Kwang-Il Choi,Pega Hrnjak.International Journal of Heat and Mass Transfer . 2011 (9)
[5] Boiling heat transfer in narrow channels with offset strip fins: Application to electronic chipsets cooling[J] . B. Pulvirenti,A. Matalone,U. Barucca.Applied Thermal Engineering . 2010 (14)
[6] Flow boiling heat transfer and pressure drop of R-134a in a mini tube: an experimental investigation[J] . Jacqueline B. Copetti,Mario H. Macagnan,Flávia Zinani,Nicole L.F. Kunsler.Experimental Thermal and Fluid Science . 2010 (4)
[7] A composite heat transfer correlation for saturated flow boiling in small channels[J] . Stefan S. Bertsch,Eckhard A. Groll,Suresh V. Garimella.International Journal of Heat and Mass Transfer . 2008 (7)
[8] Effects of heat flux, mass flux, vapor quality, and saturation temperature on flow boiling heat transfer in microchannels[J] . Stefan S. Bertsch,Eckhard A. Groll,Suresh V. Garimella.International Journal of Multiphase Flow . 2008 (2)
[9] Boiling heat transfer of R-22, R-134a, and CO 2 in horizontal smooth minichannels[J] . Kwang-Il Choi,A.S. Pamitran,Chun-Young Oh,Jong-Taek Oh.International Journal of Refrigeration . 2007 (8)
[10] An experimental study of flow boiling in a rectangular channel with offset strip fins
Kim, Byongjoo
Sohn, Byonghu
[J]. INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 2006, 27 (03) : 514 - 521

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