DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kwon, Gi Hwan | ko |
dc.contributor.author | Kim, Sung-Jin | ko |
dc.date.accessioned | 2016-04-15T02:59:04Z | - |
dc.date.available | 2016-04-15T02:59:04Z | - |
dc.date.created | 2015-07-05 | - |
dc.date.created | 2015-07-05 | - |
dc.date.issued | 2015-10 | - |
dc.identifier.citation | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.89, pp.817 - 828 | - |
dc.identifier.issn | 0017-9310 | - |
dc.identifier.uri | http://hdl.handle.net/10203/203879 | - |
dc.description.abstract | Experiments were performed to investigate the effect of a dual-diameter channel on the flow and heat transfer characteristics of flat plate micro pulsating heat pipes (MPHPs). Using MEMS techniques, the MPHPs were fabricated: rectangular channels with dual hydraulic diameters were engraved on a silicon wafer to form a meandering closed loop with 5 turns. The Pyrex glass was used as a cover which enables flow visualization in the MPHP. Experimental results show that the MPHPs with a dual-diameter channel can operate stably even in a horizontal position and have uniform thermal performance regardless of the orientation when a proper condition is met. It is postulated that the orientation-independent performance occurs when the capillary pressure generated by the difference in channel diameters is larger than the viscous pressure drop. This postulate was experimentally confirmed using Ethanol and FC-72 as working fluids at various input powers and inclination angles. To provide a guideline for orientation-independent operation of the MPHP with a dual-diameter channel a figure of merit is proposed: the figure of merit is defined as the ratio of capillary pressure difference to the viscous pressure drop, which is similar to the figure of merit for a conventional heat pipe. According to experimental data, the figure of merit has to be larger than 2 x 10(5) for orientation-independent operation of the MPHP. | - |
dc.language | English | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.subject | FLOW | - |
dc.title | Experimental investigation on the thermal performance of a micro pulsating heat pipe with a dual-diameter channel | - |
dc.type | Article | - |
dc.identifier.wosid | 000359029600076 | - |
dc.identifier.scopusid | 2-s2.0-84931269469 | - |
dc.type.rims | ART | - |
dc.citation.volume | 89 | - |
dc.citation.beginningpage | 817 | - |
dc.citation.endingpage | 828 | - |
dc.citation.publicationname | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | - |
dc.identifier.doi | 10.1016/j.ijheatmasstransfer.2015.05.091 | - |
dc.contributor.localauthor | Kim, Sung-Jin | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | A dual-diameter channel | - |
dc.subject.keywordAuthor | Pulsating heat pipe | - |
dc.subject.keywordAuthor | Capillary pressure | - |
dc.subject.keywordAuthor | Figure of merit | - |
dc.subject.keywordPlus | FLOW | - |
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