Volume 35 Issue 1
Jan.  2009
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Zhu Jianqin, Xu Guoqiang, Tao Zhi, et al. Numerical investigation of heat transfer and flow resistance in U-shaped variable cross-section channels with different rib heights[J]. Journal of Beijing University of Aeronautics and Astronautics, 2009, 35(1): 18-22. (in Chinese)
Citation: Zhu Jianqin, Xu Guoqiang, Tao Zhi, et al. Numerical investigation of heat transfer and flow resistance in U-shaped variable cross-section channels with different rib heights[J]. Journal of Beijing University of Aeronautics and Astronautics, 2009, 35(1): 18-22. (in Chinese)

Numerical investigation of heat transfer and flow resistance in U-shaped variable cross-section channels with different rib heights

  • Received Date: 04 Jan 2008
  • Publish Date: 31 Jan 2009
  • The flow and temperature distribution in U-shaped variable cross-section channels with different rib heights was investigated numerically by a new developed three-dimensional Navier-Stokes code with low Reynolds number k-ε turbulence model. The rib pitch is 25 mm and the rib heights are 1 mm,1.5 mm,2 mm respectively. The Reynolds number Re based on the inlet velocity of the cooling air and hydraulic diameter are 7 500,12 500,18 500,25 000. Numerical results reveal that the average Nusselt number of the channel increases with the increase of Reynolds number. The enhanced heat transfer was achieved with the higher rib height e when Re is equal to 7 500 and 12 500. The higher heat transfer characteristics can be reached for the case of e =1.5 mm when Re is equal to 18 500 and 25 000. The effects of rib heights on local heat transfer show different behavior due to the different local Reynolds numbers and centrifugal force. The higher rib height e enhanced the heat transfer of inflow passage. In outflow passage, the higher the rib height, the better heat transfer behavior is produced for Re =7 500 and 12 500, while for Re =18 500 and 25 000 the optimum rib height is 1.5 mm.

     

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  • [1] Chyu M K. Regional heat transfer in two-pass and three-pass passages with 180° turns [J]. ASME Journal of Heat Transfer , 1991,113:63-70 [2] Ekkad S V, Han J C. Detailed heat transfer distributions in two-pass square channels with rib turbulators [J]. Int J Heat Mass Transfer, 1997,40(11):2525-2537 [3] Ekkad S V, Huang Y Z, Han J C. Detailed heat transfer distributions in two-pass square channels with rib turbulators and bleed holes[J]. Int J Heat Mass Transfer, 1987, 41(23): 3781-3791 [4] Ekkad S V, Pamula G, Shantiniketanam M. Detailed heat transfer measurements inside straight and tapered two-pass channels with turbulators [J]. Experimental Thermal and Fluid Science , 2000,22:155-163 [5] Hirota M, Fujita H, Cai H, et al. Heat (mass) transfer in rectangular cross-sectioned two-pass channels with an inclined divider wall[J]. Int J Heat Mass Transfer, 2002,45:1093-1107 [6] Liu X Y, Ding S T, Tao Z, et al. Heat transfer characteristic inside two-pass variable cross-section channels with ribs and bleed holes . ASME GT2004-53529,2004 [7] 刘湘云,丁水汀,陶智,等.变截面U型通道内肋高对换热特性影响的实验[J].航空动力学报,2007,22(7):1138-1141 Liu Xiangyun, Ding Shuiting, Tao Zhi, et al. Experimental study of heat transfer in snake-shaped variable cross-section channels with different rib heights[J]. Journal of Aerospace Power, 2007, 22(7): 1138-1141(in Chinese) [8] 吴望一.流体力学[M].北京:北京大学出版社,1983 Wu Wangyi. Fluid dynamics[M]. Beijing: Peking University Press, 1983(in Chinese)
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