Seed bubbles trigger boiling heat transfer in silicon microchannels
文献类型：期刊论文
| 作者 | Liu, Guohua1; Xu, Jinliang1; Yang, Yongping2 |
| 刊名 | microfluidics and nanofluidics
 |
| 出版日期 | 2010-03-01 |
| 卷号 | 8期号:3页码:341-359 |
| 关键词 | Seed bubble Microchannel Boiling incipience Thermal non-equilibrium |
| ISSN号 | 1613-4982 |
| 产权排序 | [liu, guohua; xu, jinliang] chinese acad sci, micro energy syst lab, guangzhou inst energy convers, guangzhou 510640, peoples r china; [yang, yongping] n china elect power univ, beijing key lab energy safety & clean utilizat, beijing 102206, peoples r china |
| 通讯作者 | xujl@ms.giec.ac.cn ; yyp@ncepu.edu.cn |
| 中文摘要 | the smooth channel surface of microsystems delays boiling incipience in heated microchannels. in this paper, we use seed bubbles to trigger boiling heat transfer and control thermal non-equilibrium of liquid and vapor phases in parallel microchannels. the test section consisted of a top glass cover and a silicon substrate. microheater array was integrated at the top glass cover surface and driven by a pulse voltage signal to generate seed bubbles in time sequence. each microheater corresponds to a specific microchannel and is located in the microchannel upstream. five triangular microchannels with a hydraulic diameter of 100 mu m and a length of 12.0 mm were etched in the silicon substrate. a thin platinum film was deposited at the back surface of silicon chip with an effective heating area of 4,500 x 1,366 mu m, acting as the main heater for the heat transfer system. acetone liquid was used. with the data range reported here, boiling incipience was not initiated if wall superheats are smaller than 15a degrees c without seed bubbles assisted. injection seed bubbles triggers boiling incipience and controls thermal non-equilibrium between liquid and vapor phases successfully. four modes of flow and heat transfer are identified. modes 1, 2, and 4 are the stable ones without apparent oscillations of pressure drops and heating surface temperatures, and mode 3 displays flow instabilities with apparent amplitudes and long periods of these parameters. the four modes are divided based on the four types of flow patterns observed in microchannels. seed bubble frequency is a key factor to influence the heat transfer. the higher the seed bubble frequency, the more decreased non-equilibrium between two phases and heating surface temperatures are. the seed bubble frequency can reach a saturation value, at which heat transfer enhancement attains the maximum degree, inferring that a complete thermal equilibrium of two phases is approached. the saturation frequency is about a couple of thousand hertz in this study. |
| 英文摘要 | the smooth channel surface of microsystems delays boiling incipience in heated microchannels. in this paper, we use seed bubbles to trigger boiling heat transfer and control thermal non-equilibrium of liquid and vapor phases in parallel microchannels. the test section consisted of a top glass cover and a silicon substrate. microheater array was integrated at the top glass cover surface and driven by a pulse voltage signal to generate seed bubbles in time sequence. each microheater corresponds to a specific microchannel and is located in the microchannel upstream. five triangular microchannels with a hydraulic diameter of 100 mu m and a length of 12.0 mm were etched in the silicon substrate. a thin platinum film was deposited at the back surface of silicon chip with an effective heating area of 4,500 x 1,366 mu m, acting as the main heater for the heat transfer system. acetone liquid was used. with the data range reported here, boiling incipience was not initiated if wall superheats are smaller than 15a degrees c without seed bubbles assisted. injection seed bubbles triggers boiling incipience and controls thermal non-equilibrium between liquid and vapor phases successfully. four modes of flow and heat transfer are identified. modes 1, 2, and 4 are the stable ones without apparent oscillations of pressure drops and heating surface temperatures, and mode 3 displays flow instabilities with apparent amplitudes and long periods of these parameters. the four modes are divided based on the four types of flow patterns observed in microchannels. seed bubble frequency is a key factor to influence the heat transfer. the higher the seed bubble frequency, the more decreased non-equilibrium between two phases and heating surface temperatures are. the seed bubble frequency can reach a saturation value, at which heat transfer enhancement attains the maximum degree, inferring that a complete thermal equilibrium of two phases is approached. the saturation frequency is about a couple of thousand hertz in this study. |
| WOS标题词 | science & technology ; technology ; physical sciences |
| 学科主题 | science & technology - other topics ; instruments & instrumentation ; physics |
| 类目[WOS] | nanoscience & nanotechnology ; instruments & instrumentation ; physics, fluids & plasmas |
| 研究领域[WOS] | science & technology - other topics ; instruments & instrumentation ; physics |
| 关键词[WOS] | flow ; instability |
| 收录类别 | SCI |
| 资助信息 | national natural science foundation of china [50825603] |
| 原文出处 | https://dx.doi.org/10.1007/s10404-009-0465-y |
| 语种 | 英语 |
| WOS记录号 | WOS:000274212700005 |
| 公开日期 | 2014-12-24 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/8514]  |
| 专题 | 中国科学院广州能源研究所 |
| 作者单位 | 1.Chinese Acad Sci, Micro Energy Syst Lab, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 2.N China Elect Power Univ, Beijing Key Lab Energy Safety & Clean Utilizat, Beijing 102206, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Guohua,Xu, Jinliang,Yang, Yongping. Seed bubbles trigger boiling heat transfer in silicon microchannels[J]. microfluidics and nanofluidics,2010,8(3):341-359. |
| APA | Liu, Guohua,Xu, Jinliang,&Yang, Yongping.(2010).Seed bubbles trigger boiling heat transfer in silicon microchannels.microfluidics and nanofluidics,8(3),341-359. |
| MLA | Liu, Guohua,et al."Seed bubbles trigger boiling heat transfer in silicon microchannels".microfluidics and nanofluidics 8.3(2010):341-359. |
入库方式： OAI收割
来源：广州能源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。