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Seed bubbles trigger boiling heat transfer in silicon microchannels
Liu, Guohua1; Xu, Jinliang1; Yang, Yongping2
2010-03-01
Source PublicationMICROFLUIDICS AND NANOFLUIDICS
ISSN1613-4982
Volume8Issue:3Pages:341-359
Contribution Rank[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
Corresponding Authorxujl@ms.giec.ac.cn ; yyp@ncepu.edu.cn
AbstractThe 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.
SubtypeArticle
Other AbstractThe 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.
KeywordSeed Bubble Microchannel Boiling Incipience Thermal Non-equilibrium
Subject AreaScience & Technology - Other Topics ; Instruments & Instrumentation ; Physics
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1007/s10404-009-0465-y
WOS Subject ExtendedScience & Technology - Other Topics ; Instruments & Instrumentation ; Physics
URL查看原文
WOS KeywordFLOW ; INSTABILITY
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China [50825603]
WOS SubjectNanoscience & Nanotechnology ; Instruments & Instrumentation ; Physics, Fluids & Plasmas
WOS IDWOS:000274212700005
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/8514
Collection中国科学院广州能源研究所
Affiliation1.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
Recommended Citation
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.
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