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Heat Transfer Enhancement of supercritical nitrogen Flowing Downward in a Small Vertical Tube:Evaluation of System Parameter Effects

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Journal of Thermal Science 2020年第6期29卷 1487-1503页

作者： ZHU Xiaojing LYU Zhihao YU Xiao LI Qiang CAO Maoguo REN Yongxiang Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116024China Shenyang Aeroengine Research Institute Aero Engine Corporation of ChinaShenyang 110015China

In this paper,the heat transfer enhancement(HTE)of supercritical nitrogen flowing downward in a vertical small tube(diameter 2 mm)is studied using the commercial software CFX of Ansys16.1,to provide theoretical guidance on the design of high-performance heat transfer *** effective numerical simulation method,which employs the SSG Reynolds stress model with enhanced wall treatment,is applied to study the heat transfer of supercritical nitrogen under typical working *** objective is to evaluate the effect of the main parameters taking into account the buoyancy and flow acceleration *** results are compared with results calculated from three well-known empirical correlations and the applicability of empirical correlation is discussed in *** is discovered that the Watts and Chou correlation accurately fits the simulation results of supercritical nitrogen and the Dittus-Boelter and Jackson correlations can only be used for high-pressure *** HTE of supercritical nitrogen is closely related to the laminar sub-layer and buffer layer of a boundary *** buoyancy effect on the HTE should be considered at low mass flux conditions,and thermal acceleration can be completely ignored for the cases *** special HTE featured by the increment in heat transfer coefficient with increasing heat flux is discovered at low pressure,and simulation results proved that this HTE is caused by the combined actions of buoyancy as well as significant variations in specific heat and viscosity.

关键词： supercritical nitrogen heat transfer enhancement(THE) numerical simulation vertically downward flow system parameter evaluation

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