Flows Generated by Electrohydrodynamic Gas Pumps with Different Electrode Orientations

IF 1.1 4区工程技术 Q4 ENGINEERING, MECHANICAL Journal of Thermophysics and Heat Transfer Pub Date : 2023-04-16 DOI:10.2514/1.t6711

A. Mazumder, F. Lai

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Abstract

Numerical simulations have been performed to examine the flows inside a square channel produced by a two-stage electrohydrodynamic (EHD) gas pump with two electrode arrangements. The EHD pump has a pair of seven emitting electrodes flush mounted on two parallel walls at each stage. The flush-mounted electrodes produce corona wind similar to a wall jet that is mainly responsible for flow delivery. The pump is operated by a combination of three different voltages (24, 26, and 28 kV) for performance improvement. Because flow visualization is very challenging to implement in experimental study of EHD flows, very few results are available in the literature. As such, this study is specifically aimed at providing additional insight to the flowfield inside the channel through visualization of the numerical results obtained. Also, the overall effectiveness of the EHD gas pump is evaluated by the volume flow rate delivered as well as its power efficiency. It has been found that the power efficiency for the EHD pumps considered is higher than the conventional fans/pumps. Thus, they have a great potential for applications in thermal management. Particularly, they can be more energy efficient when they are operated by uneven applied voltages.

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不同电极方向的电液动气体泵产生的流动

已经进行了数值模拟，以检查由具有两个电极布置的两级电流体动力学（EHD）气泵产生的方形通道内的流动。EHD泵有一对七个发射电极，每个阶段齐平安装在两个平行的壁上。齐平安装的电极产生类似于主要负责流量输送的壁射流的电晕风。泵由三种不同电压（24、26和28 kV）的组合操作，以提高性能。由于在EHD流动的实验研究中实现流动可视化非常具有挑战性，因此文献中的结果很少。因此，本研究旨在通过对所获得的数值结果进行可视化，为通道内的流场提供更多的见解。此外，EHD气泵的整体效率通过输送的体积流量及其功率效率来评估。已经发现，所考虑的EHD泵的功率效率高于传统的风扇/泵。因此，它们在热管理方面具有巨大的应用潜力。特别地，当它们由不均匀的施加电压操作时，它们可以更节能。

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来源期刊

Journal of Thermophysics and Heat Transfer 工程技术-工程：机械

CiteScore

3.50

自引率

19.00%

发文量

审稿时长

3 months

期刊介绍： This Journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. The Journal publishes qualified papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include aerothermodynamics; conductive, convective, radiative, and multiphase modes of heat transfer; micro- and nano-scale heat transfer; nonintrusive diagnostics; numerical and experimental techniques; plasma excitation and flow interactions; thermal systems; and thermophysical properties. Papers that review recent research developments in any of the prior topics are also solicited.