Experimental investigation of convection heat transfer of CO2 at super-critical pressures in vertical mini-tubes and in porous media
Experimental investigation of convection heat transfer of CO2 at super-critical pressures in vertical mini-tubes and in porous media
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DOI：
10.1016/j.applthermaleng.2003.12.024
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发表时间：
2004-06
影响因子：
6.4
通讯作者：
P. Jiang;Yi-Jun Xu;Jing Lv;Run-Fu Shi;S. He;J. Jackson
中科院分区：
文献类型：
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作者：
P. Jiang;Yi-Jun Xu;Jing Lv;Run-Fu Shi;S. He;J. Jackson
对超临界压力下CO2在直径为0.948和4 mm的垂直管内以及颗粒直径为0.2- 0.28mm的多孔介质中的对流换热进行了实验研究。在实验中测量了局部换热系数、流体本体温度和壁面温度，研究了入口温度、质量流量和热流密度对微小管和多孔管内对流换热的影响。超临界CO2的热物理性质和浮力的变化显著影响了垂直细管内和多孔介质中的对流换热。多孔管内的对流换热与空管内的对流换热有很大的不同。
Convection heat transfer of CO2at super-critical pressures in vertical tubes with diameters of 0.948 and 4 mm and in porous media with particle diameters of 0.2–0.28 mm was investigated experimentally. The local heat transfer coefficients, fluid bulk temperatures, and wall temperatures were measured in the tests which investigated the effects of inlet temperature, mass flow rate, and heat flux on the convection heat transfer in the mini-tube and the porous tube. The variable thermophysical properties of super-critical CO2and buoyancy significantly influenced the convection heat transfer in the vertical mini-tubes and in the porous media. The convection heat transfer in the porous tubes was very different from that in empty tubes.