Comparison of heat transfer performances of helix baffled heat exchangers with different baffle configurations  

不同折流板结构螺旋折流板换热器传热性能的比较(英文)

作　　者：董聪 陈亚平 吴嘉峰 

机构地区：[1]School of Energy and Environment, Southeast University [2]School of Light Industry, Zhejiang University of Science and Technology

出　　处：《Chinese Journal of Chemical Engineering》2015年第1期255-261,共7页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(50976022,51276035);the Provincial Science and Technology Innovation and Transformation of Achievements of Special Fund Project of Jiangsu Province(BY2011155)

摘　　要：Numerical simulations were performed on flow and heat transfer performances of heat exchangers having six helical baffles of different baffle shapes and assembly configurations, i.e., two trisection baffle schemes, two quadrant baffle schemes, and two continuous helical baffle schemes. The temperature contour or the pressure contour and velocity contour plots with superimposed velocity vectors on meridian, transverse and unfolded concentric hexagonal slices are presented to obtain a full angular view. For the six helix baffled heat exchangers,the different patterns of the single vortex secondary flow and the shortcut leakage flow were depicted as well as the heat transfer properties were compared. The results show that the optimum scheme among the six configurations is a circumferential overlap trisection helix baffled heat exchanger with a baffle incline angle of 20°(20°TCO) scheme with an anti-shortcut baffle structure, which exhibits the second highest pressure dropΔpo, the highest overall heat transfer coefficient K, shell-side heat transfer coefficient hoand shell-side average comprehensive index ho/Δpo.Numerical simulations were performed on flow and heat transfer performances of heat exchangers having six helical baffles of different baffle shapes and assembly configurations, i.e., two trisection baffle schemes, two quadrant baffle schemes, and two continuous helical baffle schemes. The temperature contour or the pressure contour and velocity contour plots with superimposed velocity vectors on meridian, transverse and unfolded concentric hexagonal slices are presented to obtain a full angular view. For the six helix baffled heat exchangers,the different patterns of the single vortex secondary flow and the shortcut leakage flow were depicted as well as the heat transfer properties were compared. The results show that the optimum scheme among the six configurations is a circumferential overlap trisection helix baffled heat exchanger with a baffle incline angle of 20°（20°TCO） scheme with an anti-shortcut baffle structure, which exhibits the second highest pressure dropΔpo, the highest overall heat transfer coefficient K, shell-side heat transfer coefficient hoand shell-side average comprehensive index ho/Δpo.

关 键 词：Helix baffled heat exchanger Trisection baffle Quadrant baffle Continuous baffle Circumferential overlap baffle Secondary flow Heat transfer Numerical simulation 

分 类 号：TQ051.5[化学工程] TK172[动力工程及工程热物理—热能工程]