Experimental and numerical comparison of the heat transfer behaviors and buoyancy effects of supercritical CO2 in various heating tubes
Experimental and numerical comparison of the heat transfer behaviors and buoyancy effects of supercritical CO2 in various heating tubes
复制标题
超临界CO2在各种加热管中的传热行为和浮力效应的实验和数值比较
DOI：
10.1016/j.ijheatmasstransfer.2019.119074
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发表时间：
2020-03
影响因子：
5.2
通讯作者：
Dang Chaobin
中科院分区：
文献类型：
--
作者：
Zhang Shijie;Xu Xiaoxiao;Liu Chao;Liu Xinxin;Ru Zhipeng;Dang Chaobin
对于不同的流动方向和物理模型，浮力效应对流动特性的影响存在着本质的区别，换热特性也随之发生变化。为了抑制传热恶化，提高传热性能，有必要对超临界CO2在各种加热管内的传热行为进行研究。采用实验和数值模拟相结合的方法，对超临界CO2在内径为4 mm的竖直直管、水平管和竖直螺旋管中的传热和流动特性进行了对比研究。试验压力为7.5 ~ 9 MPa，流量为80-600 kg/（m2·s）。热通量覆盖范围从10 kW/m2到70 kW/m2。揭示了不同物理模型中浮力效应与流动特性的耦合关系，并利用实验数据验证了各种浮力准则。实验结果表明，浮力参数的选取需要充分考虑浮力与水流方向的相互作用。实验数据表明，竖直管内的传热恶化比水平管内严重。一般来说，螺旋管在平均传热性能方面具有显著的优势，特别是在强浮力的情况下。根据实验数据，提出了适用于水平管和螺旋管的新的经验关联式。
For the different flow orientations and physical models, the influence of buoyancy effect on flow characteristics exist essential difference, the heat transfer behaviors change accordingly. To suppress heat transfer deterioration and improve heat transfer performance, it is quite necessary to discuss the heat transfer behaviors of supercritical CO2in various heating tubes. The heat transfer and flow characteristics of supercritical CO2heated in the vertically straight tube, horizontal tube, and vertical helical-coiled tube, with inner diameter of 4 mm, are comparatively studied by experiments and numerical simulations. The tests are conducted at operating pressures from 7.5 MPa to 9 MPa, the mass flow rate is in the range of 80–600 kg/(m2•s). The heat flux covers a range from 10 kW/m2to 70 kW/m2. The coupling relationship of buoyancy effect and flow characteristics in different physical models are revealed, and the various buoyancy criteria are validated with experimental data. The experimental results confirm that the employment of buoyancy parameter needs to take full account of the interaction between buoyancy force and flow orientations. And experimental data indicate that the heat transfer deterioration in the vertical tube is more serious than it in the horizontal tube. Generally, the helical-coiled tube has a noteworthy advantage for the average heat transfer performance, especially in the case of strong buoyancy. The new empirical correlations for the horizontal tube and helical-coiled tube are proposed with experimental data.
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DOI：
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