The buoyancy force and flow acceleration effects of supercritical CO2 on the turbulent heat transfer characteristics in heated vertical helically coiled tube
The buoyancy force and flow acceleration effects of supercritical CO2 on the turbulent heat transfer characteristics in heated vertical helically coiled tube
复制标题
超临界CO2浮力和流动加速对加热立式螺旋管内湍流传热特性的影响
DOI：
10.1016/j.ijheatmasstransfer.2018.04.033
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发表时间：
2018-10
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;Zhang Yadong;Dang Chaobin
采用数值模拟的方法研究了超临界co2在加热垂直螺旋盘管中的湍流换热特性，重点分析了浮力和流动加速度对换热的影响机理。结果表明，浮力和离心力对换热效率的影响相似，均在截面内引起二次流，提高了换热效率。建立了浮力参数ϕ2和流动加速度参数q+，并与数值结果进行了比较好的验证。在这两个参数的基础上，分别提出了浮力因子f和加速度因子fac2来量化浮力和流动加速度效应。此外，还引入了温差校正因子来考虑热物性的变化。提出了垂直螺旋盘管超临界co2 - in函数ofFb， facand ft的半经验传热关系式。
Numerical simulations are performed to investigate the turbulent heat transfer characteristics of supercritical CO2in heated vertical helically coiled tube, and primary focus is to analyze the mechanism of buoyancy force and flow acceleration on the heat transfer. The results show similar effect from buoyancy force and centrifugal force, and both forces induce a secondary flow in the cross section that improves the heat transfer efficiency. The buoyancy parameterϕ2and flow acceleration parameterq+are established with reasonably good validation against numerical results. On the basis of the two parameters, the buoyancy factorFband the acceleration factorFAcare proposed to quantify buoyancy and flow acceleration effect, respectively. Furthermore, a temperature difference correction factorFtis introduced to consider variation of thermo-physical properties. A new semi-empirical heat transfer correlation is proposed for supercritical CO2in function ofFb,FAcandFtfor the vertical helically coiled tube.
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影响因子：
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作者：
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