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Analysis of heat transfer performance for turbulent viscoelastic fluid-based nanofluid using field synergy principle

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Science China(Technological Sciences) 2015年第7期58卷 1137-1145页

作者： YANG JuanCheng LI FengChen NI MingJiu YU Bo School of Physical Sciences University of Chinese Academy of Sciences School of Energy Science and Engineering Harbin Institute of Technology Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum

In this paper,the field synergy principle is firstly performed on the viscoelastic fluid-based nanofluid and other relevant fluid in channel at turbulent flow state to scrutinize their heat transfer performance based on our direct numerical simulation *** cosine values of intersection angle between velocity vector and temperature gradient vector are calculated for different simulated cases with varying nanoparticle volume fraction,nanoparticle diameter,Reynolds number and Weissenberg *** is found that the filed synergy effect is enhanced when the nanoparticle volume fraction is increased,nanoparticle diameter is decreased and Weissenberg number is decreased,*** heat transfer is also ***,the filed synergy effect is weakened with the increase of Reynolds number which may be the possible reason for the power function relationship in empirical correlation of heat transfer between heat transfer performance and Reynolds number with the constant power exponent lower than ***,it is also observed that the field synergy principle can be used to analyze the heat transfer process of viscoelastic fluid-based nanofluid at the turbulent flow state even if some negative cosine values of intersection angle exist in the flow field.

关键词： viscoelastic fluid-based nanofluid filed synergy principle intersection angle turbulent drag reduction heat transferenhancement

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A Novel Design of Thermoelectric Generator for Automotive Waste heat Recovery

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Automotive Innovation 2018年第1期1卷 54-61页

作者： Kuo Huang Yuying Yan Bo Li Yong Li Kai Li Jun Li Fluids and Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNottinghamUK Fluids and Thermal Engineering Research Centre University of Nottingham Ningbo ChinaNingboChina School of Automotive and Mechanical Engineering South China University of TechnologyGuangzhouChina FAW Group Corporation ChangchunChina

With progressively stringent fuel consumption regulations,many researchers and engineers are focusing on the employment of waste heat recovery technologies for automotive *** as a promising method of waste heat recovery,the thermoelectric generator(TEG)has been given increasing attention over the whole automotive industry for the last *** this study,we first give a brief review of improvements in thermoelectric materials and heat exchangers for TEG *** then present a novel design for a concentric cylindrical TEG system that addresses the existing weaknesses of the heat *** place of the typical square-shaped thermoelectric module,our proposed concentric cylindrical TEG system uses an annular thermoelectric module and employs the advantages of the heat pipe to enhance the heat transfer in the radial *** simulations we carried out to verify the performance of the proposed system showed better power output among the existing TEG system,and a comparison of water-inside and gas-inside arrangements showed that the water-inside concentric cylindrical TEG system produced a higher power output.

关键词： Wasteheatrecovery Thermoelectric generator heat pipe heat transferenhancement Numerical simulation

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