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《Journal of Xi'an Jiaotong University》 2018-09
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Experimental Investigation for Multi-Valued Hydrodynamic Feature of Super-Critical Cyclohexane in Horizontal Tubes

SHAN Yafei;LI Tianhui;YANG Zhuqiang;ZHANG Bo;LIU Feng;School of Energy and Power Engineering,Dalian University of Technology;  
Aiming at the flow instability in regenerative cooling technology,the hydrodynamic feature of super-critical hydrocarbon is studied experimentally.The results show that multivalued hydrodynamic feature exists in super-critical fluid.The multi-valued feature weakens with the increasing system pressure and inlet temperature,but strengthens with the increasing heat flux.In addition,decreasing tube length or increasing tube internal diameter can improve the multi-valued hydrodynamic feature so as to enhance flow stability.According to the experimental data,a correlation is obtained by dimensionless method to predict the onset of flow instability(OFI)for super-critical fluid.The correlation consists of only three dimensionless parameters,but contains five important parameters affecting OFI.The error between the numerical and the experimental results gets within 10%.
【Fund】: 国家自然科学基金资助项目(51606030);; 中国博士后科学基金资助项目(2016M591429)
【CateGory Index】: V430;TJ760
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