Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.2061
DC FieldValueLanguage
dc.contributor.authorXu, Guoqiang-
dc.contributor.authorZhang, Haochun-
dc.contributor.authorXie, Ming-
dc.contributor.authorJin, Yan-
dc.date.accessioned2019-03-12T09:26:43Z-
dc.date.available2019-03-12T09:26:43Z-
dc.date.issued2017-10-30-
dc.identifier.citationAIP Advances 10 (7): art. no. 105322 (2017)de_DE
dc.identifier.issn2158-3226de_DE
dc.identifier.urihttp://hdl.handle.net/11420/2065-
dc.description.abstractThermal harvesting devices based on transformation optics, which can manipulate the heat flux concentration significantly through rational arrangements of the conductivities, have attracted considerable interest owing to several great potential applications of the technique for high-efficiency thermal conversion and collection. However, quantitative studies on the geometrical effects, particularly wedge angles, on the harvesting behaviors are rare. In this paper, we adopt wedge structure-based thermal harvesting schemes, and focus on the effects of the geometrical parameters including the radii ratios and wedge angles on the harvesting performance. The temperature deformations at the boundaries of the compressional region and temperature gradients for the different schemes with varying design parameters are investigated. Moreover, a concept for temperature stabilization was derived to evaluate the fluctuation in the energy distributions. In addition, the effects of interface thermal resistances have been investigated. Considering the changes in the radii ratios and wedge angles, we proposed a modification of the harvesting efficiency to quantitatively assess the concentration performance, which was verified through random tests and previously fabricated devices. In general, this study indicates that a smaller radii ratio contributes to a better harvesting behavior, but causes larger perturbations in the thermal profiles owing to a larger heat loss. We also find that a smaller wedge angle is beneficial to ensuring a higher concentration efficiency with less energy perturbations. These findings can be used to guide the improvement of a thermal concentrator with a high efficiency in reference to its potential applications as novel heat storage, thermal sensors, solar cells, and thermoelectric devices.en
dc.description.sponsorshipNational Natural Science Foundation of China (Grant Nos. 51776050 and 51536001).de_DE
dc.language.isoende_DE
dc.publisherAmerican Institute of Physics (AIP) ; American Crystallographic Association (ACA)de_DE
dc.relation.ispartofAIP Advancesde_DE
dc.rightsCC BY 4.0de_DE
dc.rightsinfo:eu-repo/semantics/openAccess-
dc.subject.ddc530: Physikde_DE
dc.titleGeometrical effects on the concentrated behavior of heat flux in metamaterials thermal harvesting devicesde_DE
dc.typeArticlede_DE
dc.identifier.urnurn:nbn:de:gbv:830-882.027299-
dc.identifier.doi10.15480/882.2061-
dc.type.diniarticle-
dc.subject.ddccode530-
dcterms.DCMITypeText-
tuhh.identifier.urnurn:nbn:de:gbv:830-882.027299-
tuhh.oai.showtruede_DE
tuhh.abstract.englishThermal harvesting devices based on transformation optics, which can manipulate the heat flux concentration significantly through rational arrangements of the conductivities, have attracted considerable interest owing to several great potential applications of the technique for high-efficiency thermal conversion and collection. However, quantitative studies on the geometrical effects, particularly wedge angles, on the harvesting behaviors are rare. In this paper, we adopt wedge structure-based thermal harvesting schemes, and focus on the effects of the geometrical parameters including the radii ratios and wedge angles on the harvesting performance. The temperature deformations at the boundaries of the compressional region and temperature gradients for the different schemes with varying design parameters are investigated. Moreover, a concept for temperature stabilization was derived to evaluate the fluctuation in the energy distributions. In addition, the effects of interface thermal resistances have been investigated. Considering the changes in the radii ratios and wedge angles, we proposed a modification of the harvesting efficiency to quantitatively assess the concentration performance, which was verified through random tests and previously fabricated devices. In general, this study indicates that a smaller radii ratio contributes to a better harvesting behavior, but causes larger perturbations in the thermal profiles owing to a larger heat loss. We also find that a smaller wedge angle is beneficial to ensuring a higher concentration efficiency with less energy perturbations. These findings can be used to guide the improvement of a thermal concentrator with a high efficiency in reference to its potential applications as novel heat storage, thermal sensors, solar cells, and thermoelectric devices.de_DE
tuhh.publisher.doi10.1063/1.4986984-
tuhh.publication.instituteTechnische Thermodynamik M-21de_DE
tuhh.identifier.doi10.15480/882.2061-
tuhh.type.opus(wissenschaftlicher) Artikel-
tuhh.institute.germanInstitut für Technische Thermodynamikde
tuhh.institute.englishTechnische Thermodynamik M-21de_DE
tuhh.gvk.hasppnfalse-
openaire.rightsinfo:eu-repo/semantics/openAccessde_DE
dc.type.driverarticle-
dc.rights.cchttps://creativecommons.org/licenses/by/4.0/de_DE
dc.rights.ccversion4.0de_DE
dc.type.casraiJournal Article-
tuhh.container.issue10de_DE
tuhh.container.volume7de_DE
tuhh.container.startpage105322de_DE
dc.rights.nationallicensefalsede_DE
item.fulltextWith Fulltext-
item.creatorOrcidXu, Guoqiang-
item.creatorOrcidZhang, Haochun-
item.creatorOrcidXie, Ming-
item.creatorOrcidJin, Yan-
item.grantfulltextopen-
item.languageiso639-1other-
item.creatorGNDXu, Guoqiang-
item.creatorGNDZhang, Haochun-
item.creatorGNDXie, Ming-
item.creatorGNDJin, Yan-
crisitem.author.deptTechnische Thermodynamik M-21-
crisitem.author.orcid0000-0002-2297-6827-
crisitem.author.parentorgStudiendekanat Maschinenbau-
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