Enhanced ionic wind output using emitter-surface decoration under varying ambient conditions

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-09-29 DOI:10.1016/j.ijthermalsci.2025.110351

J.G. Qu , X.W. Wu , J.F. Zhang , X. Zhao , L.M. Yan

{"title":"Enhanced ionic wind output using emitter-surface decoration under varying ambient conditions","authors":"J.G. Qu , X.W. Wu , J.F. Zhang , X. Zhao , L.M. Yan","doi":"10.1016/j.ijthermalsci.2025.110351","DOIUrl":null,"url":null,"abstract":"<div><div>Ionic wind is a novel airflow phenomenon for cooling, food drying, and flow control etc. Decorating the emitter is an effective method to reduce corona-inception voltage and enhance wind-velocity output. However, its underlying correlation mechanisms have not been fully revealed, and the influence of ambient conditions on the effectiveness of emitter decoration remains unclear. In this study, an ionic wind blower is investigated to reveal the changes in corona-discharge behavior and ionic wind output after the emitter is decorated with graphene and carbon nanotubes (CNTs), respectively. The influence of temperature and humidity on the effectiveness of emitter decoration in enhancing corona and ionic wind output are clearly identified. The results indicate graphene decoration increases the Trichel-pulse frequency (by at least 16.83 % at 20 °C) but reduces pulse amplitudes, while CNT decoration has the opposite effect, reducing the frequency by up to 52.4 % at 20 °C. Emitter decoration lowers the corona-inception voltage and increases discharge current at low humidity. High humidity weakens or even cancels the effectiveness of emitter decoration in enhancing corona. Temperature rise further suppresses the intended enhancement effect of emitter decoration owing to the increased current magnitude and intensified condensation. Emitter decoration significantly boosts ionic wind velocity and remains effective across varying temperatures and humidity levels. CNT decoration is more effective than graphene decoration, proving the advantages of micron-scale discharge sites.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"220 ","pages":"Article 110351"},"PeriodicalIF":5.0000,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Thermal Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S129007292500674X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Ionic wind is a novel airflow phenomenon for cooling, food drying, and flow control etc. Decorating the emitter is an effective method to reduce corona-inception voltage and enhance wind-velocity output. However, its underlying correlation mechanisms have not been fully revealed, and the influence of ambient conditions on the effectiveness of emitter decoration remains unclear. In this study, an ionic wind blower is investigated to reveal the changes in corona-discharge behavior and ionic wind output after the emitter is decorated with graphene and carbon nanotubes (CNTs), respectively. The influence of temperature and humidity on the effectiveness of emitter decoration in enhancing corona and ionic wind output are clearly identified. The results indicate graphene decoration increases the Trichel-pulse frequency (by at least 16.83 % at 20 °C) but reduces pulse amplitudes, while CNT decoration has the opposite effect, reducing the frequency by up to 52.4 % at 20 °C. Emitter decoration lowers the corona-inception voltage and increases discharge current at low humidity. High humidity weakens or even cancels the effectiveness of emitter decoration in enhancing corona. Temperature rise further suppresses the intended enhancement effect of emitter decoration owing to the increased current magnitude and intensified condensation. Emitter decoration significantly boosts ionic wind velocity and remains effective across varying temperatures and humidity levels. CNT decoration is more effective than graphene decoration, proving the advantages of micron-scale discharge sites.

查看原文本刊更多论文

在不同的环境条件下，利用发射器表面装饰增强离子风输出

离子风是一种用于冷却、食品干燥和流量控制等领域的新型气流现象。对发射极进行装饰是降低起晕电压、提高风速输出的有效方法。然而，其潜在的相关机制尚未完全揭示，环境条件对发射器装饰效果的影响尚不清楚。在本研究中，研究了一个离子鼓风机，揭示了分别用石墨烯和碳纳米管（CNTs）装饰后的电晕放电行为和离子风输出的变化。明确了温度和湿度对发射极装饰增强电晕和离子风输出效果的影响。结果表明，石墨烯修饰增加了trichell脉冲频率（在20°C时至少增加了16.83%），但降低了脉冲幅度，而碳纳米管修饰具有相反的效果，在20°C时将频率降低了52.4%。发射极装饰降低了起晕电压，增加了低湿度下的放电电流。高湿会削弱甚至抵消发射极装饰增强电晕的效果。温度升高进一步抑制了发射极装饰的预期增强效果，因为电流增大和凝结加剧。发射器装饰显著提高离子风速，并在不同温度和湿度水平下保持有效。碳纳米管装饰比石墨烯装饰更有效，证明了微米尺度放电位点的优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.