| 摘要: |
| 本文选用近共沸制冷剂R4I0A,对相同尺寸的一根光管和两根双侧强化管进行了管外沸腾换热实验研究。对于光管管外沸腾换热,将实验结果分别结合Coper公式和Gaenflo公式得到的管内表面传热系数与经验公式计算值进行了对比,结果显示两者误差保持在15%以下,验证了实验结果的准确性。运用Wilsn图解法分别求得两根换热管管内换热强化倍率分别为1.85~2.05和2.02~2.25,通过不同方式改变热流量,综合对比1#换热管和2#换热管总传热系数与管两侧表面传热系数,结果 均显示由于强化管肋类型的不同, I#换热管管外表面结构更有利于汽化核心形成气泡,比2#换热管总传热系数高约10%,管外 表面传热系数高约20%~25%,更加符合强化水平单管管外池沸腾换热的要求。 |
| 关键词: 池沸腾 R410A 强化传热 Wilsox图解法 换热关联式 |
| DOI： |
| 投稿时间：2020-07-19 修订日期：2020-10-27
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| 基金项目:本文受上海市动力工程多相流动与传热重点实验室窄通道内液膜生成机理的研究项目(2019KJFZ201) 资助。 |
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| Effect of Tube Surface Structure on Performance of Pool Boiling Heat Transfer on Horizontal Single Tube |
|
Liu Pengpeng1, Huang Lihao1,2, Chen Jianhong3, Tao Leren1,2, Zhou Zhuo1, Huang Jiayu1
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| (1.School of Energy and Power Engineering ,University of Shanghai for Science and Technology;2.Shanghai Key Laboratory of Muliphase Flow and Heat Transfer in Power Engineering;3.Shanghai First Refrigerating Machine Co.，Ld.) |
| Abstract: |
| In this study, one smooth tube and two double-sided enhanced tubes with the same size were used in an experimental study and the boiling heat transfer performance outside the tube with a near-azeotropic refrigerant (R410A) was compared. For the boiling heat transfer outside the smooth tube, the internal surface coefficients of heat transfer calculated by the Cooper and Gorenflo formulas were compared with the empirically calculated value. The results showed that the errors between the two was less than 15%, which verifies the accuracy of the experimental results. With the help of Wilson diagram method, the heat transfer enhancement ratios of the two double-sided enhanced tubes are 1.85–2.05 and 2.02–2.25, respectively. By changing the heat flux, the total heat transfer coefficients of heat exchange tube #1 and heat exchange tube 2# and surface coefficients of heat transfer on both sides of the tube were comprehensively compared. The results showed that the outer surface structure of heat exchange tube 1# was more conducive to the formation of bubbles in the vaporization core because of the different types of reinforced ribs. The total heat transfer coefficients of heat exchange tube 1# was approximately 10% higher than that of heat exchange tube 2#, and the surface coefficient of heat exchange tube 1# was approximately 20%–25% higher than that of heat exchange tube 2#. It indicates that heat exchange tube 1# is more in line with the requirements of pool boiling heat transfer enhancement for horizontal single pipe. |
| Key words: pool boiling R410A heat transfer enhancement Wilson plot method heat transfer correlation |
