DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jun, Soohwan | ko |
dc.contributor.author | Kim, Sung Jin | ko |
dc.date.accessioned | 2019-04-18T02:10:03Z | - |
dc.date.available | 2019-04-18T02:10:03Z | - |
dc.date.created | 2019-04-16 | - |
dc.date.created | 2019-04-16 | - |
dc.date.created | 2019-04-16 | - |
dc.date.issued | 2019-05 | - |
dc.identifier.citation | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.134, pp.321 - 328 | - |
dc.identifier.issn | 0017-9310 | - |
dc.identifier.uri | http://hdl.handle.net/10203/261018 | - |
dc.description.abstract | In the present study, the thermodynamic state of vapor plugs in micro pulsating heat pipes (MPHPs) is experimentally investigated. The experiments are performed using the silicon-based MPHP with 10 turns. The rectangular micro-channels engraved on the silicon wafer form a closed loop and have the width and the depth of 1 mm and 0.5 mm, respectively. The overall dimensions of the MPHP are 50 x 33.5 x 1.7 mm(3). Ethanol is used as the working fluid and the filling ratio is 47% on the average. A transparent glass wafer is bonded to the silicon wafer for flow visualization. The temporal variations in temperature and pressure of a vapor plug in the MPHP are obtained using micro-thermocouples and pressure transducers. The measured temperature and pressure data are fully synchronized in real time with the flow characteristics obtained through a high-speed photography. It is experimentally found that the thermodynamic state of a vapor plug in the MPHP depends on the presence of the liquid film surrounding the vapor plug. If a vapor plug is surrounded by the liquid film, the vapor plug is saturated and there is no temperature difference along the vapor plug. On the other hand, if a vapor plug is in direct contact with the dry wall without the liquid film, the vapor plug is superheated and there is a difference in the vapor temperature between the evaporator section and the adiabatic section. These results can pave the way to a thorough understanding of the thermo-hydrodynamic coupling in PHPs. (C) 2019 Elsevier Ltd. All rights reserved. | - |
dc.language | English | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.title | Experimental investigation on the thermodynamic state of vapor plugs in pulsating heat pipes | - |
dc.type | Article | - |
dc.identifier.wosid | 000462418300029 | - |
dc.identifier.scopusid | 2-s2.0-85060133939 | - |
dc.type.rims | ART | - |
dc.citation.volume | 134 | - |
dc.citation.beginningpage | 321 | - |
dc.citation.endingpage | 328 | - |
dc.citation.publicationname | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | - |
dc.identifier.doi | 10.1016/j.ijheatmasstransfer.2019.01.053 | - |
dc.contributor.localauthor | Kim, Sung Jin | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | CLOSED-LOOP | - |
dc.subject.keywordPlus | FLOW | - |
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