R134a在多孔扁管内沸腾换热试验研究
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摘要
采用试验的方法对制冷剂R134a在多孔扁管内的沸腾换热特性进行研究,搭建沸腾换热试验系统,以R134a为工质对当量直径为0.63mm的多孔扁管的沸腾换热特性进行研究,试验中质量流率范围为116.5~466.0kg·m-2·s-1,热流密度范围为13~52.7kW/m2。试验结果与适用于微小尺寸通道的沸腾换热公式的计算值对比可知,沸腾换热系数试验值与Bertsch公式计算值吻合度较高,且只在大质量流率时,试验值才与Cooper公式和Liu and Winterton公式计算值接近。
The boiling heat transfer characteristics of a multi-port extruded tube are experimentally investigated.To test the boiling heat transfer characteristics of the tube in equivalent diameter 0.63mm,a boiling heat transfer test system with refrigerant R134 ais built as the working medium.Tests are performed with a mass flux of 116.5—466.0kg·m-2·s-1 and a heat flux of 13—52.7kW/m2.The experimental results are compared with the calculation results of the formulas that suit for boiling heat transfer in small size channel.It shows that the experimental data of boiling heat transfer coefficient fit well with the calculations of Bertsch correlation,and only in the big mass flux,the data are close to the calculations of the Cooper correlation and Liu and Winterton correlation.
The boiling heat transfer characteristics of a multi-port extruded tube are experimentally investigated.To test the boiling heat transfer characteristics of the tube in equivalent diameter 0.63mm,a boiling heat transfer test system with refrigerant R134 ais built as the working medium.Tests are performed with a mass flux of 116.5—466.0kg·m-2·s-1 and a heat flux of 13—52.7kW/m2.The experimental results are compared with the calculation results of the formulas that suit for boiling heat transfer in small size channel.It shows that the experimental data of boiling heat transfer coefficient fit well with the calculations of Bertsch correlation,and only in the big mass flux,the data are close to the calculations of the Cooper correlation and Liu and Winterton correlation.
引文
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[4]Shizuo Saitoh,Hirofumi Daiguji,Eiji Hihara.Effect of tube diameter on boiling heat transfer of R-134ain horizontal small-diameter tubes[J].International Journal of Heat and Mass Transfer,2005,48(23/24):4973-4984.
[5]Shizuo Saitoh,Dang Chaobin,Yoshitaka Nakamura.Boiling heat transfer of HFO-1234yf flowing in a smooth small-diameter horizontal tube[J].International Journal of Refrigeration,2011,34(8):1846-1853.
[6]王际辉,唐大伟,颜晓虹.矩形微槽内水的流动沸腾换热及可视化试验研究[J].中国科学院研究生院学报,2007,24(1):34-38.Wang Jihui,Tang Dawei,Yan Xiaohong.An experimental study on the flow boiling heat transfer and its visualization of water in a rectangular micro-groove horizontally laid[J].Journal of the Graduate School of the Chinese Academy of Sciences,2007,24(1):34-38.
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[8]Bertsch S S,Groll E A,Garimella S V.Effects of heat flux,mass flux,vapor quality,and saturation temperature on flow boiling heat transfer in microchannels[J].Int J Multiphase Flow,2009,35(2):142-154.
[9]Cooper M G.Heat flow rates in saturated nucleate pool boiling—A wide ranging examination using reduced properties[J].Adv Heat Transfer,1984(16):157-239.
[10]Liu Z,Winterton R H S.A general correlation for saturated and sub-cooled flow boiling in tubes and annuli based on a nucleate pool boiling equation[J].Int J Heat and Mass Transfer,1991,34(11):2759-2766.
[2]Tran T N,Wambsganss M W.Small circular and rectangular channel boiling with two refrigerants[J].Int J Multiphase Flow,1996,22(3):485-498.
[3]Owhaib W.Evaporative heat transfer in vertical circular micro-channel[J].Applied Thermal Engineering,2004,24(8/9):1241-1253.
[4]Shizuo Saitoh,Hirofumi Daiguji,Eiji Hihara.Effect of tube diameter on boiling heat transfer of R-134ain horizontal small-diameter tubes[J].International Journal of Heat and Mass Transfer,2005,48(23/24):4973-4984.
[5]Shizuo Saitoh,Dang Chaobin,Yoshitaka Nakamura.Boiling heat transfer of HFO-1234yf flowing in a smooth small-diameter horizontal tube[J].International Journal of Refrigeration,2011,34(8):1846-1853.
[6]王际辉,唐大伟,颜晓虹.矩形微槽内水的流动沸腾换热及可视化试验研究[J].中国科学院研究生院学报,2007,24(1):34-38.Wang Jihui,Tang Dawei,Yan Xiaohong.An experimental study on the flow boiling heat transfer and its visualization of water in a rectangular micro-groove horizontally laid[J].Journal of the Graduate School of the Chinese Academy of Sciences,2007,24(1):34-38.
[7]Bertsch S S,Groll E A,Garimella S V.A composite heat transfer correlation for saturated flow boiling in small channels[J].Int J Heat and Mass Transfer,2009,52(7/8):2110-2118.
[8]Bertsch S S,Groll E A,Garimella S V.Effects of heat flux,mass flux,vapor quality,and saturation temperature on flow boiling heat transfer in microchannels[J].Int J Multiphase Flow,2009,35(2):142-154.
[9]Cooper M G.Heat flow rates in saturated nucleate pool boiling—A wide ranging examination using reduced properties[J].Adv Heat Transfer,1984(16):157-239.
[10]Liu Z,Winterton R H S.A general correlation for saturated and sub-cooled flow boiling in tubes and annuli based on a nucleate pool boiling equation[J].Int J Heat and Mass Transfer,1991,34(11):2759-2766.