Investigation of heat transfer enhancement by electrohydrodynamics in a double-wall-heated channel
Investigation of heat transfer enhancement by electrohydrodynamics in a double-wall-heated channel
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双壁加热通道电流体动力学强化传热研究
DOI：
10.1016/j.ijheatmasstransfer.2017.05.079
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发表时间：
2017-10
影响因子：
5.2
通讯作者：
Xiao-Dong Wang
中科院分区：
文献类型：
--
作者：
Tian-Hu Wang;Ming Peng;Xiao-Dong Wang
本研究以双壁加热矩形通道为研究对象，探讨电流体动力学强化传热之特性。双壁加热通道的EHD强化传热机理与单壁加热通道不同。提出了一种有利的电极布置，其中一个电极撞击在顶壁上，另一个撞击在底壁上。此外，部分双壁接地模式也被采用。在上述上级设计的基础上，EHD强化传热效果得到了显著提高，与无EHD强化传热相比，上壁强化传热效果提高了166.4%，下壁强化传热效果提高了242.7%。其机理可归结为消除了通道中所谓的“额外电体力”的负效应和消除了本体流与电晕射流诱导涡之间的“屏障效应”。此外，还研究了电极对的纵向位置（d）和两个电极之间的差距（l）的影响。结果表明，顶壁和底壁的传热强化均随d的增大而减小。随着l的增加，顶壁的增强程度先增加后逐渐减小，而底壁的增强程度则是单调增加的。涡流效应是由通道中的“额外电体力”的负效应和涡流温度共同决定的。
In this study, heat transfer enhancement by electrohydrodynamics (EHD) in a rectangular double-wall-heated channel with an emitting electrode pair is investigated. The mechanism of EHD-enhanced heat transfer in double-wall-heated channels is different from that in single-wall-heated counterparts. An advantageous electrode arrangement in which one electrode impinges on the top wall and the other one impinges on the bottom wall is proposed. Furthermore, partially double-wall-grounded pattern is also employed. Based on the above superior design, the heat transfer enhancement level by EHD is dramatically improved, which is enhanced by 166.4% for the top wall and 242.7% for the bottom wall compared with those without EHD effect. The mechanism can be attributed to eliminating the so-called negative effect of “extra electric body force” in the channel and removing the “barrier effect” between the bulk flow and the corona jet-induced vortex. Besides, the effects of longitudinal position of the electrode pair (d) and the gap between two electrodes (l) are also examined. It is found that heat transfer enhancements for the top and the bottom wall both decrease withd. It is also observed that aslincreases, enhanced level for the top wall is firstly increased and then gradually reduced, while it is monotonically enhanced for the bottom wall. The effects ofdandlare determined by combination of the negative effect of “extra electric body force” in the channel and the vortex temperature.
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DOI：
10.1016/j.ijheatmasstransfer.2013.04.010
发表时间：
2013-09
影响因子：
5.2
作者：
S. I. N. Ayuttaya;Chainarong Chaktranond;P. Rattanadecho
通讯作者：
S. I. N. Ayuttaya;Chainarong Chaktranond;P. Rattanadecho
影响因子：
8.7
作者：
N. Kasayapanand;T. Kiatsiriroat
通讯作者：
N. Kasayapanand;T. Kiatsiriroat
影响因子：
1.8
作者：
N. Kasayapanand
通讯作者：
N. Kasayapanand
影响因子：
4.4
作者：
A. Mazumder;F. Lai
通讯作者：
A. Mazumder;F. Lai
影响因子：
1.8
作者：
Hesam Moayedi;N. Amanifard;H. M. Deylami;F. Dolati
通讯作者：
Hesam Moayedi;N. Amanifard;H. M. Deylami;F. Dolati