| CO2/DME混合工质在水平管内对流换热的数值研究 |
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| 引用本文： | 刘佳.CO2/DME混合工质在水平管内对流换热的数值研究[J].湘潭大学自然科学学报,2011,33(3):110-114. |
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| 作者姓名： | 刘佳 |
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| 作者单位： | 北京大学工学院;绍兴市华汇能源环境工程技术有限公司; |
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| 摘 要： | 采用CO2/DME（二甲醚）混合流体作为传热工质，建立了其在水平管内的物理模型和控制方程，对其换热和流动特性进行了数值研究.通过数值计算，得到了混合工质在管内的速度和温度分布规律，比较了雷诺数和DME质量分数对混合工质传热的影响.研究发现影响CO2/DME混合工质传热特性的主要控制因素为流体的热物理特性.分析表明CO2/DME混合工质在水平管内具有良好的换热特性：在雷诺数2 300的工况下，CO2/DME（70/30）混合流体可以有效提高换热效率20%；工质在管内受到的流动阻力随着雷诺数的增大而减小，随着DME质量分数的增大而增大.
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| 关 键 词： | CO2/DME 混合工质 对流换热 数值模拟 |
Numerical Study on Convective Heat Transfer of CO2/DME Mixture in a Horizontal Tube |
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| LIU Jia,ZHANG Xin-rong,XU Jian-yang.Numerical Study on Convective Heat Transfer of CO2/DME Mixture in a Horizontal Tube[J].Natural Science Journal of Xiangtan University,2011,33(3):110-114. |
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| Authors: | LIU Jia ZHANG Xin-rong XU Jian-yang |
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| Institution: | LIU Jia1,ZHANG Xin-rong1,XU Jian-yang2(1.College of Engineering,Peking University,Beijing 100871,2.Shaoxing Huahui Energy and Environment Engineering CO,LTD,Shaoxing 312000 China) |
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| Abstract: | In the present study,the physical models and governing equations of CO2/DME mixtures in the horizontal tube are set up.The flow and heat transfer characteristics of CO2/DME are numerically simulated with the laminar model.The velocity and temperature distributions of CO2/DME mixtures in the tube are obtained.And the effects of different DME mass fractions and Reynolds Numbers on the Nusselt Number are presented.It is found that the CO2/DME mixtures have good heat transfer performances due to their unique th... |
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| Keywords: | CO2/DME mixed working fluid flow and heat transfer numerical simulation |
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