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

• Published in: Chinese journal of chemical engineering Vol. 23; no. 1; pp. 255 - 261
• Main Authors: Dong, Cong, Chen, Yaping, Wu, Jiafeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2015
• Subjects: Baffles; Circumferential overlap baffle; Computer simulation; Continuous baffle; Heat exchangers; Heat transfer; Heat transfer coefficients; Helical; Helix baffled heat exchanger; Numerical simulation; Pressure drop; Quadrant baffle; Secondary flow; Shape; Trisection baffle; 传热系数K; 换热性能; 数值模拟; 板结构; 等值线图; 组合配置; 螺旋折流板换热器; 速度矢量; Trisection baffle; Helix baffled heat exchanger; Quadrant baffle; Numerical simulation; Continuous baffle; Secondary flow; Circumferential overlap baffle; Heat transfer
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/j.cjche.2014.10.014

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.