Regulation-controlling of boundary layer by multi-wire-to-cylinder negative corona discharge

Regulation-controlling of boundary layer by multi-wire-to-cylinder negative corona discharge
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多线筒负电晕放电边界层调节控制

DOI:
10.1016/j.applthermaleng.2017.03.092
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发表时间:
2017-06
影响因子:
6.4
通讯作者:
Lin Mei
Lin Mei
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang Wei;Yang Lanjun;Wu Kai;Lin Cen;Huo Peng;Liu Shuai;Huang Dong;Lin Mei

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为了更好地理解与强化传热性能直接相关的电流体动力学现象,对多丝-圆柱电晕放电进行了研究。建立了单极近似模型,对离子风的传热和速度分布进行了数值模拟。数值计算结果与实验结果吻合较好。结果表明,较高的外加电压和较多的电晕线有利于减小热边界层厚度,增大边界层速度梯度,从而强化传热。当外加电压从-7 kV增加到-11 kV,电晕线数从1增加到3时,热边界层厚度减小39.8%。在U = −11 kV的条件下,电晕线数N = 3时的局部强制对流换热系数最大值为自然对流换热系数的12倍,平均值为自然对流换热系数的8倍。
Multi-wire-to-cylinder corona discharge was studied for better understanding of the electrohydrodynamic phenomena which directly relate to the performance of heat transfer enhancement. A unipolar approximation model was established and numerical simulations were conducted to determinate the heat transfer and velocity distribution of ionic wind. The numerical and experiments results show good agreement. It indicates that higher applied voltage and more corona wires can help decreasing thermal boundary layer thickness and increasing velocity gradient of boundary layer, resulting in the enhancement of heat transfer. When the applied voltage increases from−7 kV to −11 kV and the number of wire increases from corona wire number 1–3, there will be a 39.8% decrease of the thickness of thermal boundary layer. In the condition ofU= −11 kV, the maximum local forced convection heat transfer coefficient for corona wire numberN= 3 is 12 times and the average value is 8 times higher than that of natural convection.
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发表时间: 2010-02-01
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