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Article: A phase-change thermal diode using electrostatic-induced coalescing-jumping droplets

TitleA phase-change thermal diode using electrostatic-induced coalescing-jumping droplets
Authors
KeywordsCoalescing-jumping droplets
Effective thermal conductivity
Electric field
Experimental analysis
Thermal diode
Issue Date2019
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhmt
Citation
International Journal of Heat and Mass Transfer, 2019, v. 135, p. 294-304 How to Cite?
AbstractAnalogous to the electronic diode, a thermal diode is a device which allows heat to flow to a preferential direction. Compared with other thermal diodes, phase-change thermal diodes yield greater thermal rectification performance due to high latent heat. With coalescing-jumping droplets as a result of dropwise condensation and water evaporation through a vapor space in the forward mode and thermal conduction through a high thermal resistance material in the reverse mode, the thermal rectification of this phase-change thermal diode can be higher than 100. However, due to the limited jumping height of coalescing-jumping droplets, progressive flooding occurs on a non-wetting surface causing a degraded heat transfer performance. Nevertheless, an applied electric field has proved to be one of the effective methods to enhance heat transfer in water evaporation and dropwise condensation. Thus, this study aims to investigate the effects of applied electrical fields on the effective thermal conductivity and thermal rectification of a phase-change thermal diode using electrostatic-induced coalescing-jumping droplets. The thermal diode is designed, assembled and investigated experimentally. The results show that the applied electric field potentially enhances the effective thermal conductivity and thermal rectification of the phase-change thermal diode. At the applied electrical voltage of 50 V, the maximum average thermal rectification of 325 is reported. This number shows a 90% greater improvement over thermal rectification in the no-electric-field condition and is considered to be one of the highest performances of all experimental thermal diode studies.
Persistent Identifierhttp://hdl.handle.net/10722/271238
ISSN
2019 Impact Factor: 4.947
2015 SCImago Journal Rankings: 1.749

 

DC FieldValueLanguage
dc.contributor.authorTraipattanakul, B-
dc.contributor.authorTso, CY-
dc.contributor.authorChao, CYH-
dc.date.accessioned2019-06-24T01:06:00Z-
dc.date.available2019-06-24T01:06:00Z-
dc.date.issued2019-
dc.identifier.citationInternational Journal of Heat and Mass Transfer, 2019, v. 135, p. 294-304-
dc.identifier.issn0017-9310-
dc.identifier.urihttp://hdl.handle.net/10722/271238-
dc.description.abstractAnalogous to the electronic diode, a thermal diode is a device which allows heat to flow to a preferential direction. Compared with other thermal diodes, phase-change thermal diodes yield greater thermal rectification performance due to high latent heat. With coalescing-jumping droplets as a result of dropwise condensation and water evaporation through a vapor space in the forward mode and thermal conduction through a high thermal resistance material in the reverse mode, the thermal rectification of this phase-change thermal diode can be higher than 100. However, due to the limited jumping height of coalescing-jumping droplets, progressive flooding occurs on a non-wetting surface causing a degraded heat transfer performance. Nevertheless, an applied electric field has proved to be one of the effective methods to enhance heat transfer in water evaporation and dropwise condensation. Thus, this study aims to investigate the effects of applied electrical fields on the effective thermal conductivity and thermal rectification of a phase-change thermal diode using electrostatic-induced coalescing-jumping droplets. The thermal diode is designed, assembled and investigated experimentally. The results show that the applied electric field potentially enhances the effective thermal conductivity and thermal rectification of the phase-change thermal diode. At the applied electrical voltage of 50 V, the maximum average thermal rectification of 325 is reported. This number shows a 90% greater improvement over thermal rectification in the no-electric-field condition and is considered to be one of the highest performances of all experimental thermal diode studies.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhmt-
dc.relation.ispartofInternational Journal of Heat and Mass Transfer-
dc.subjectCoalescing-jumping droplets-
dc.subjectEffective thermal conductivity-
dc.subjectElectric field-
dc.subjectExperimental analysis-
dc.subjectThermal diode-
dc.titleA phase-change thermal diode using electrostatic-induced coalescing-jumping droplets-
dc.typeArticle-
dc.identifier.emailChao, CYH: cyhchao@hku.hk-
dc.identifier.authorityChao, CYH=rp02396-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ijheatmasstransfer.2019.01.110-
dc.identifier.scopuseid_2-s2.0-85061058124-
dc.identifier.hkuros298130-
dc.identifier.volume135-
dc.identifier.spage294-
dc.identifier.epage304-
dc.publisher.placeUnited Kingdom-

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