| 摘要: |
| 在内径为2 mm的水平不锈钢微通道内对R410A的沸腾换热特性进行了实验研究。质量流率为200～600 kg/(m2?s)，热流密度的范围为5～15 kW/m2，干度的范围为0～0.8，饱和温度为0 ℃和5 ℃。结果显示，当干度大于0.5时，随着热流密度的上升，沸腾换热系数显著上升，其平均增幅分别达到了4.6%和7.7%。当干度小于0.5时，热流密度对换热系数的影响十分微弱。随着质量流率的上升，换热系数均出现了小幅上升，其平均增幅也分别达到了1.1%和2%。而饱和温度对换热系数则几乎没有影响。随后，对可能的机理进行了讨论。实验结果又与Choi K I等以及Ebisu T等在内径分别为1.5 mm, 3 mm和6.4 mm管道内的研究结果进行了比较。结果显示，在相似工况下，随着管径的下降，当干度小于0.5时，换热系数呈现出上升的趋势，其平均增幅分别达到了18.4%，23.6%和19.5%。 |
| 关键词: 微通道 沸腾换热系数 实验研究 R410A |
| DOI：10.3969/j.issn.0253-4339.2015.04.058 |
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| 基金项目: |
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| The Experimental Study of Boiling Heat Transfer of R410A in Microchannel |
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Ge Qilin, Liu Jianhua, Zhang Liang, Zhang Huichen
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| (College of Energy and Power Engineering, University of Shanghai for Science and Technology) |
| Abstract: |
| The boiling heat transfer coefficients of R410A are investigated in a single horizontal stainless steel microchannel with 2 mm inner diameter. The experiments are conducted by varying the mass flux from 200 to 600 kg/(m2?s), heat flux from 5 to 15 kW/m2, quality from 0.1 to 0.8, while maintaining the saturation temperature at 0 ℃ and 5 ℃. The results show that the boiling heat transfer coefficients rise sharply with the increase of the heat flux when the quality is higher than 0.5, and the average increase amplitudes are 4.6% and 7.7%. The influence of the heat flux on heat transfer coefficients is negligible when the quality is lower than 0.5. The heat transfer coefficients rise slightly with the increase of the mass flux, and the average increase amplitudes are 1.1% and 2%. But the saturation temperature almost has no influence on heat transfer coefficients. After that, the possible mechanisms are discussed. At last, the results are also compared with the results of Choi et al and Ebisu et al, whose inner diameters are 1.5 mm, 3 mm and 6.4 mm. It shows that the heat transfer coefficients will increase with the decrease of the inner diameter when the quality is lower than 0.5, and the average increase amplitudes are 18.4%, 23.6% and 19.5% respectively. |
| Key words: microchannel boiling heat transfer coefficient experiment study R410A |
