Heat transfer of swirling impinging jets ejected from Nozzles with twisted tapes utilizing CFD technique
Heat transfer of swirling impinging jets ejected from Nozzles with twisted tapes utilizing CFD technique
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DOI：
10.1016/j.csite.2015.08.001
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发表时间：
2015-09-01
影响因子：
6.8
通讯作者：
Gerdroodbary, M. Barzegar
中科院分区：
文献类型：
--
作者：
Amini, Younes;Mokhtari, Mojtaba;Gerdroodbary, M. Barzegar
这项研究利用旋转冲击射流研究了强制对流换热。这项研究的重点是通过数值方法配备扭曲带的喷嘴。利用完全结构化的网格创建的计算域，从纵横比和倾斜度的角度来看具有非常高的质量。数值模拟在四种不同的射流到板距离 (LID) 2、4、6 和 8、四种雷诺数 4000、8000、12,000 和 16,000 以及四种不同的捻比 (y/w) 3、4、5 和 6 下进行。独立于网格的测试是根据平均努塞尔数进行的。获得的结果与公开文献中的可用实验数据非常吻合。观察到，对于L/D=6和L/D=8的射流到板的距离，旋流射流的传热速率高于常规射流，并且由于动量传递速率更大，所以在较高雷诺数下传热速率增加。此外，对一对喷嘴进行了计算，结果表明，在相同的空气流量下，使用两个喷嘴代替一个喷嘴可以提高传热速率。 (C) 2015 年作者。由爱思唯尔有限公司出版
This research investigated the forced convection heat transfer by using the swirling impinging jets. This study focused on nozzles, which equipped with twisted tapes via a numerical approach. The computational domain created by utilizing the fully structured meshes, which had very high quality from the viewpoint of aspect ratio and skewness. The numerical simulations were performed at four different jet-to-plate distances (LID) of 2, 4, 6 and 8, four Reynolds numbers of 4000, 8000, 12,000 and 16,000, and also four different twist ratios (y/w) of 3, 4, 5 and 6. The mesh-independent tests were conducted based upon the average Nusselt number. The obtained results revealed good agreement with the available experimental data from the open literature. It was observed that for jet-to-plate distances of L/D=6 and L/D=8, the heat transfer rate of swirling jets was more than regular jets, and heat transfer rate at higher Reynolds numbers increased due to the greater rate of momentum transfer. Besides, the calculation done for a pair of jets, and the results shown that using two jets, instead of one, could increase the rate of heat transfer in the same air flow rate. (C) 2015 The Authors. Published by Elsevier Ltd.