https://scholars.lib.ntu.edu.tw/handle/123456789/598992
標題: | Boiling heat transfer enhancement over copper tube via electrolytic and electrostatic effects | 作者: | Cheng H.-C Lin H.-C Chen P.-H. PING-HEI CHEN |
關鍵字: | Bubble dynamics;Bubble nucleation;Charged surfactants;Copper tubes;Heat transfer coefficient;Pool boiling;Atmospheric pressure;Copper;Crystallization;Electric fields;Heat transfer coefficients;Nucleation;Surface active agents;Tubes (components);Boiling heat transfer enhancement;Electrolytics;Electrostatic effect;Heat transfer co-efficients;Heat transfer performance;Bubbles (in fluids) | 公開日期: | 2021 | 卷: | 199 | 來源出版物: | Applied Thermal Engineering | 摘要: | The effects of electrolytic pool boiling with and without the application of charged surfactants on heat transfer performance were experimentally investigated. The experiments were conducted at the saturated state under atmospheric pressure. This is the first study of the heat transfer mechanism in pool boiling using electrolysis with charged surfactants on copper tubes. The results indicate that heat transfer performance is not proportional to the applied electrolytic current. An optimal current was obtained for the enhancement of the heat transfer coefficient during electrolytic boiling. Supported by high-speed images, an analysis of bubble behaviors under different conditions was conducted. Compared with when water was used as the working fluid without the application of an electric field, the use of charged surfactants in electrolytic boiling with a current of 3 mA resulted in a 1.68 times higher heat transfer coefficient due to the number of bubble nucleation sites and the bubble departure frequency. Furthermore, the circumferential surface temperature distributions during boiling under different experimental conditions were elucidated by the analysis of bubble dynamics. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85115436026&doi=10.1016%2fj.applthermaleng.2021.117584&partnerID=40&md5=52d79da8cc511dbc6d0d510090bafa3b https://scholars.lib.ntu.edu.tw/handle/123456789/598992 |
ISSN: | 13594311 | DOI: | 10.1016/j.applthermaleng.2021.117584 |
顯示於: | 機械工程學系 |
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