Yang Mei
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, College of Power Engineering, Chongqing University, Chongqing, China.
PLoS One. 2016 Jul 26;11(7):e0159602. doi: 10.1371/journal.pone.0159602. eCollection 2016.
Cooling heat transfer of supercritical CO2 in horizontal straight tubes with wall is numerically investigated by using FLUENT. The results show that almost all models are able to present the trend of heat transfer qualitatively, and the stand k-ε with enhanced wall treatment model shows the best agreement with the experimental data, followed by LB low Re turbulence model. Then further studies are discussed on velocity, temperature and turbulence distributions. The parameters which are defined as the criterion of buoyancy effect on convection heat transfer are introduced to judge the condition of the fluid. The relationships among the inlet temperature, outlet temperature, the mass flow rate, the heat flux and the diameter are discussed and the difference between the cooling and heating of CO2 are compared.
利用FLUENT对超临界CO₂在有壁面的水平直管中的冷却传热进行了数值研究。结果表明，几乎所有模型都能定性地呈现传热趋势，采用增强壁面处理的标准k-ε模型与实验数据吻合度最佳，其次是LB低雷诺数湍流模型。然后对速度、温度和湍流分布进行了进一步研究。引入了定义为浮力对对流换热影响准则的参数来判断流体状态。讨论了入口温度、出口温度、质量流量、热流密度和管径之间的关系，并比较了CO₂冷却和加热之间的差异。
