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Pressure recovery characteristics for a dilute gas-particle suspension flowing vertically downward in a pipe with a sudden expansion: A two-fluid modeling approach

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Particuology 2020年第3期18卷 100-111页

作者： Santosh Kumar Senapati Sukanta Kumar Dash Department of Mechanical Engineering Indian Institute of Technology KharagpurWest Bengal 721302India

This work applies the Eulerian-Eulerian model in conjunction with the kinetic theory of granular flow and inter-particle collisions to study the characteristics of pressure recovery for a dilute gas-particle suspension flowing through a pipe with a sudden expansion at a relatively higher solid *** do so,the numerical procedure was validated against experimental results for relatively small dilute phase flows in a pipe with a sudden expansion;a satisfactory agreement was ***,the effect of the two significant numerical parameters namely,the speculairty coefficient and the coefficient of restitution for particle-particle collisions were investigated and then,for fixed combinations of these parameters the effect of particle-phase volume fraction,particle density,particle size,and inlet slip ratio were *** was concluded that pressure recovery diminishes as the speculairty coefficient increases and the particle-particle coefficient of restitution *** recovery was found to increase with increasing solid volume fraction for coarse particles whereas,for fine particles,a critical volume fraction is obtained above which pressure recovery *** increase in slip ratio is found to diminish pressure ***,at relatively higher solid volume fractions,a critical diameter was found,above and below which pressure recovery decreases.

关键词： Gas-solid flow Sudden expansion pipe Eulerian-Eulerian model Pressure recovery vertically downward flow

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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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Computation of pressure drop for dilute gas-solid suspension across thin and thick orifices

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Particuology 2021年第2期19卷 209-221页

作者： Santosh Kumar Senapati Sukanta Kumar Dash Department of Mechanical Engineering Indian Institute of Technology KharagpurWest Bengal 721302India

The present work deals with the computation of the gas-solid two-phase flow pressure drop across thin and thick orifices for a vertically downward flow configuration at the higher limits of a dilute phase flow situation(0.01≤αs,in≤0.10).The Eulerian-Eulerian(two-fluid)model has been used in conjunction with the kinetic theory of granular flow with a four-way coupling *** validation of the solution process has been performed by comparing the computational result with the existing experimental *** is observed that the two-phase flow pressure drop across the orifice increases with an increase in the thickness of the orifice,and the effect is more prominent at higher solid *** pressure drop is found to increase with an increase in the solid volume *** increase in the Reynolds number or the area ratio increases the pressure *** increase in the size of the particles reduces the pressure drop across the orifice at both small and relatively large solid volume ***,a two-phase multiplier has been proposed in terms of the relevant parameters,which can be useful to evaluate the gas-solid two-phase flow pressure drop across the orifice and can subsequently help to improve the system performance.

关键词： Dilute phase flow Gas-solid flow Thin and thick orifice vertically downward flow Pressure drop

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