Numerical comparison of shell-side performance for shell and tube heat exchangers with trefoil-hole, helical and segmental baffles
Numerical comparison of shell-side performance for shell and tube heat exchangers with trefoil-hole, helical and segmental baffles
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DOI：
10.1016/j.applthermaleng.2016.08.067
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发表时间：
2016-10
影响因子：
6.4
通讯作者：
Anas El Maakoul;Azzedine Laknizi;S. Saadeddine;M. E. Metoui;A. Zaite;M. Meziane;Abdelatif Ben Abdellah-Abdelatif-Ben-Ab
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文献类型：
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作者：
Anas El Maakoul;Azzedine Laknizi;S. Saadeddine;M. E. Metoui;A. Zaite;M. Meziane;Abdelatif Ben Abdellah-Abdelatif-Ben-Ab
管壳式换热器是各种工业过程和科研前沿中应用最广泛的换热设备之一。折流板的选择是控制和改善这种换热器热工水力性能的关键。本文采用三维计算流体动力学（CFD）软件ANSYS FLUENT，对低壳程流量下三叶孔螺旋折流板和弓形折流板的壳程流场分布、传热系数和压降进行了研究和比较。在此数值比较中，整个换热器包括壳，管，挡板和喷嘴的模拟，数值模型预测的热工水力性能有相当好的精度，通过比较与实验数据的单弓形挡板。利用该模型对三叶孔和螺旋折流板换热器的热工水力性能进行了计算和比较。结果表明，螺旋折流板的传热性能优于弓形折流板，而三叶孔折流板的传热性能优于弓形折流板，且压降较大。
Shell-and-tube heat exchanger, is one of the most widely used heat exchange apparatus in various industrial process and research fronts. Baffle selection is critical to control and improve the thermo-hydraulic performance of this type of heat exchanger. In this paper, three-dimensional computational fluid dynamics (CFD) simulations, using the commercial software ANSYS FLUENT, have been performed to study and compare the shell-side flow distribution, heat transfer coefficient and the pressure drop between the recently developed trefoil-hole, helical baffles and the conventional segmental baffles, at low shell side flow rates. In this numerical comparison, the whole heat exchangers consisting of the shell, tubes, baffles and nozzles are modeled, the numerical model predicts the thermo-hydraulic performance with a considerably good accuracy, by comparing with experimental data for single segmental baffles. The model is then used to compute and compare the thermo-hydraulic performance for the same heat exchanger with trefoil-hole and helical baffles. The results show that the use of helical baffles results in higher thermo-hydraulic performance while trefoil-hole baffles has a higher heat transfer performance with large pressure drop compared to segmental baffles.