DC Field | Value | Language |
---|---|---|
dc.contributor.author | Yoon, Aejung | ko |
dc.contributor.author | Kim, Sung Jin | ko |
dc.date.accessioned | 2019-03-19T01:04:44Z | - |
dc.date.available | 2019-03-19T01:04:44Z | - |
dc.date.created | 2019-02-25 | - |
dc.date.created | 2019-02-25 | - |
dc.date.created | 2019-02-25 | - |
dc.date.issued | 2019-02 | - |
dc.identifier.citation | ENERGY CONVERSION AND MANAGEMENT, v.181, pp.48 - 58 | - |
dc.identifier.issn | 0196-8904 | - |
dc.identifier.uri | http://hdl.handle.net/10203/251492 | - |
dc.description.abstract | The purpose of this study is to experimentally examine the oscillation frequencies of liquid slugs in multi-turn micro pulsating heat pipes (MPHPs) and to perform a theoretical study for better understanding of the experimental results. A series of experiments on silicon-based MPHPs with different overall lengths of 40, 50, and 60 mm are performed at different heat inputs in a bottom-heating mode. Ethanol is used as a working fluid at a filling ratio of 55%. From a spectral analysis on flow visualization data, dominant frequencies of the MPHPs are identified for each experimental condition. To theoretically estimate the dominant frequencies, a 'non-adiabatic' vapor spring liquid mass model is proposed: The spring action of a vapor plug is linked not only to a volume variation but also to a mass variation of a non-adiabatic vapor plug via phase change processes. A distinguishing feature of this model is that it is capable of handling the mass variation of a vapor plug due to phase change processes. Based on the model, a set of parameters related to the oscillation frequency is explicitly determined: the number of turns, channel length, filling ratio, liquid density, vapor pressure and specific heat ratio. A closed-form correlation of the oscillation frequency is proposed and found to be accurate in predicting the experimental data to within 15%. It is also shown that the oscillation frequency is over-predicted by more than 100% of the experimental data when the spring-mass model is used without including the mass variation due to phase change processes. | - |
dc.language | English | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.title | Experimental and theoretical studies on oscillation frequencies of liquid slugs in micro pulsating heat pipes | - |
dc.type | Article | - |
dc.identifier.wosid | 000458221800005 | - |
dc.identifier.scopusid | 2-s2.0-85058029940 | - |
dc.type.rims | ART | - |
dc.citation.volume | 181 | - |
dc.citation.beginningpage | 48 | - |
dc.citation.endingpage | 58 | - |
dc.citation.publicationname | ENERGY CONVERSION AND MANAGEMENT | - |
dc.identifier.doi | 10.1016/j.enconman.2018.11.060 | - |
dc.contributor.localauthor | Kim, Sung Jin | - |
dc.contributor.nonIdAuthor | Yoon, Aejung | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Pulsating heat pipe | - |
dc.subject.keywordAuthor | Flow visualization | - |
dc.subject.keywordAuthor | Spectral analysis | - |
dc.subject.keywordAuthor | Theoretical model | - |
dc.subject.keywordAuthor | Oscillation frequency | - |
dc.subject.keywordPlus | THERMAL PERFORMANCE | - |
dc.subject.keywordPlus | START-UP | - |
dc.subject.keywordPlus | FLOW | - |
dc.subject.keywordPlus | VISUALIZATION | - |
dc.subject.keywordPlus | FABRICATION | - |
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