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Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2011003354
pages 25-41

THE REASON THAT FLUID FLOW DISSIPATES THE SAME ENERGY BUT OBTAINS DIFFERENT CONVECTIVE HEAT TRANSFER INTENSITY

Ye Wang
Key Laboratory of Railway Vehicle Thermal Engineering (Lanzhou Jiaotong University) Ministry of Education, Lanzhou, 730070 P. R. China;School of Environmental Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070 P. R. China
Liang-Bi Wang
School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
Yong-Heng Zhang
Key Laboratory of Railway Vehicle Thermal Engineering (Lanzhou Jiaotong University) Ministry of Education, Lanzhou, 730070 P. R. China;Department of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070 P. R. China
Liang-Cheng Wang
Key Laboratory of Railway Vehicle Thermal Engineering (Lanzhou Jiaotong University) Ministry of Education, Lanzhou, 730070 P. R. China;School of Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070 P. R. China

RÉSUMÉ

To establish a theory for finding methods of convective heat transfer enhancement actively not passively, one must connect convective heat transfer with energy dissipation in flow locally. Fluid flow consumes the same mechanical energy, but produces different convective heat transfer intensities. This is the reason that different thermal boundary conditions yield different convection intensities. Based on the transport equation of heat flux, in this paper, we explain the above phenomenon through comparisons of the differences between convective heat transfers through a tube at different thermal boundary conditions in terms of the roles of velocity gradient and velocity. The results show that the convection of flux not only depends on velocity and velocity gradient, but also depends on heat or mass flux and their gradient; if the velocity gradient makes a larger contribution to the convection of heat flux in one case rather than in another, the former will have a higher convection intensity (that is, the strength of convection, which is specified generally by the Nusselt number on the wall surface), even though the same energy is dissipated by fluid flow. The method used in this paper is useful in finding methods to enhance heat transfer.


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