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过程参数描述的等热流和等壁温平板间层流对流换热特性区别 被引量:4

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摘要 应用对流换热过程参数描述,对平行平板间层流对流换热特性在不同热边界条件下的区别进行分析.结果表明:发展段壁面上,在等热流边界条件下壁面法向方向的热通量是以对流方式传递的,虽速度为零,但速度梯度对该热通量的传输有贡献,等热流边界条件时最大速度梯度项对法向热通量的传输有贡献;在等壁温边界条件下壁面法向方向的热通量是以扩散方式传递的;在发展段流体内部,不同热边界条件下主流方向的热通量和垂直壁面的热通量均是以对流方式传输的,速度和速度梯度对主流方向和垂直壁面热通量传输的贡献与边界条件相关;在充分发展段壁面上,等热流边界条件时壁面法向方向的热通量是以对流方式传递的,速度梯度对该热通量的传输有贡献,但等壁温边界条件时是以扩散方式传递的;在充分发展段流体内部,等壁温边界条件时主流方向的热通量和垂直壁面的热通量均以对流方式传输,速度对主流方向热通量的传输有贡献,等热流边界条件时主流方向的热通量和垂直壁面的热通量均以对流方式传输,主流方向热通量的传输是一没有净换热的对流过程,速度梯度对垂直壁面热通量的传输有贡献;正是由于等热流边界条件时壁面上最大速度梯度项对法向热通量传输的贡献和等壁温边界条件时壁面上最大速度梯度项对法向热通量传输没有贡献,使得等热流边界条件对流换热强度高于等壁温边界条件的换热强度.
出处 《中国科学:技术科学》 EI CSCD 北大核心 2010年第3期280-290,共11页 Scientia Sinica(Technologica)
基金 国家自然科学基金资助项目(批准号:50876040)
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参考文献7

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同被引文献32

  • 1杨泽亮,侯志云,何杰.封闭空间电缆群散热的数值模拟[J].华南理工大学学报(自然科学版),1998,26(2):59-65. 被引量:7
  • 2Wang L B, Li X X, Lin Z M, et al. Additional descrip- tion of laminar heat convection in tube with uniform wall temperature[J]. Thermophyscis and Heat Trans- fer, 2009,23(1) : 200-205.
  • 3Wang L B, Zhang Q, Li X X. The role of velocity gradi-ent in laminar convective heat transfer through a tube with uniform wall heat flux[J]. European Journal of Physiscs, 2009,30(4) : 823-833.
  • 4Wang Y,Wang L B. The differences between the convective heat transfers through a tube at different ther- mal boundary conditions in terms of the roles of velocity gradient and velocit[J]. J. of Enhanced Heat Trans- fer, in press, 2011.
  • 5Wang L B, Huang K, Lin Z M, et al. The contribution of the velocity gradient to laminar convective heat transfer of a square duct with uniform wall heat flux [J]. JP Heat Mass Transfer, 2009(3) : 95-115.
  • 6Wang L B, Gai X P, Huang K,et al. A way to explain the thermal boundary effects on laminar convection through a square duct[J]. Frontiers of Energy and Power Engineering in China, 2010,4(4) :496-506.
  • 7Wang L B, Lin Z M, Hong K, et al. Numerical studying the characteristics of convective transport of heat fluxes in laminar flow through a square duct with uniform wall temperature[J]. Computational Thermal Sciences, 2010,2(5) : 439-454.
  • 8Li Z Y,Tao W Q. A new stability-guaranteed secondorder difference scheme[J]. Numerical Heat Transfer: B, 2002,42(4) : 349-365.
  • 9Patankar S V. Numerical heat transfer and fluid flow [M]. Washington D C: Hemisphere, 1981.
  • 10Kays W M, Crawford M E, Weigand B. Convection heat and mass transfer[M]. 4th ed. New York: Mc Graw Hill, 2005.

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