Influences of wake-effects on bubble dynamics by utilizing micro-pin-finned surfaces under microgravity
文献类型：期刊论文
| 作者 | Qi BJ; Wei JJ; Wang XL; Zhao JF(赵建福)
|
| 刊名 | APPLIED THERMAL ENGINEERING
 |
| 出版日期 | 2017 |
| 卷号 | 113页码:1332-1344 |
| 通讯作者邮箱 | jjwei@mail.xjtu.edu.cn |
| ISSN号 | 1359-4311 |
| 产权排序 | [Qi, Baojin; Wei, Jinjia; Wang, Xueli] Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China; [Qi, Baojin; Wei, Jinjia; Wang, Xueli] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Peoples R China; [Zhao, Jianfu] Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Key Lab Micrograv, Beijing 100190, Peoples R China |
| 通讯作者 | Wei, JJ (reprint author), Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China. |
| 中文摘要 | The influences of wake on bubble dynamics under various heat fluxes have been studied in microgravity. Nucleate pool boiling experiments of FC-72 on silicon chips fabricated with micro-pin-fins were conducted in 10(-3) gravitational acceleration for 3.6 s. Experimental results indicated that wake field had little influence on bubble dynamics at low heat flux, q = 12.53 W/cm(2), but its effects on bubble dynamics became very great at moderate heat flux, q = 27.89 W/cm(2), and high heat flux, q = 39.54 W/cm(2). More importantly, wake-effects appeared even more significant in microgravity. In the wake field, the horizontal flow of the liquid on micro-pin-finned silicon chips promoted the collision, coalescence and movement of bubbles, and the vertical flow of liquid phase exerted an upward force on bubbles, which can effectively shorten the growth cycle and decrease the departure radius of bubbles. Furthermore, fresh liquid could easily be inhaled into the micro-pin-finned structure owning to the negative pressure in wake region, which can supply sufficient liquid for the growth of bubble, avoiding film boiling. The interaction between the micro-pin-finned structure and the wake effect promoted the process of bubble coalescence and departure effectively, so the process of heat transfer was significantly improved on micro-pin-finned surface. In addition, the flow field and bubble behavior in wake region were also briefly analyzed based on some reasonable simplifications and hypotheses. The theoretical analyses showed that the durations of wake-effects lasted longer than the time periods of the bubble in next generation, and the bubble diameters were also smaller than the thickness of Wake region. Therefore, the dominant bubble of next generation was influenced by the wake field during its ebullition cycle, which is consistent with the experimental phenomenon. (C) 2016 Elsevier Ltd. All rights reserved. |
| 分类号 | 一类 |
| 类目[WOS] | Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics |
| 研究领域[WOS] | Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics |
| 关键词[WOS] | Wake-effects ; Microgravity ; Micro-pin-fins ; Pool boiling ; Bubble dynamics |
| 收录类别 | SCI ; EI |
| 原文出处 | http://dx.doi.org/10.1016/j.applthermaleng.2016.11.137 |
| 语种 | 英语 |
| WOS记录号 | WOS:000394723300128 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/60092]  |
| 专题 | 力学研究所_国家微重力实验室 |
| 推荐引用方式 GB/T 7714 | Qi BJ,Wei JJ,Wang XL,et al. Influences of wake-effects on bubble dynamics by utilizing micro-pin-finned surfaces under microgravity[J]. APPLIED THERMAL ENGINEERING,2017,113:1332-1344. |
| APA | Qi BJ,Wei JJ,Wang XL,&赵建福.(2017).Influences of wake-effects on bubble dynamics by utilizing micro-pin-finned surfaces under microgravity.APPLIED THERMAL ENGINEERING,113,1332-1344. |
| MLA | Qi BJ,et al."Influences of wake-effects on bubble dynamics by utilizing micro-pin-finned surfaces under microgravity".APPLIED THERMAL ENGINEERING 113(2017):1332-1344. |
入库方式： OAI收割
来源：力学研究所
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