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dc.contributor.authorGibbons, Michael
dc.date.accessioned2020-11-02T09:22:03Z
dc.date.available2020-11-02T09:22:03Z
dc.date.issued2020
dc.date.submitted2020en
dc.identifier.citationFeng, C., Gibbons, M.J., Marengo, M., Chandra, S., A novel ultra-large flat plate heat pipe manufactured by thermal spray, Applied Thermal Engineering, 2020, 171, 115030en
dc.identifier.issn1359-4311
dc.identifier.otherY
dc.identifier.urihttps://doi.org/10.1016/j.applthermaleng.2020.115030
dc.identifier.urihttp://hdl.handle.net/2262/93962
dc.descriptionPUBLISHEDen
dc.description.abstractAn ultra-large flat plate copper heat pipe (180 × 180 mm2) was constructed using a thermal spray technique, and it was then thermally characterized. A porous copper wick was fabricated by using a flame spray torch to deposit a mixture of copper and aluminum particles onto the target substrate. A stainless-steel wire mesh acts as a mask so that the coating deposited is in the form of an array of microstructures with channels between them. After spraying, the aluminum deposit is leached away by immersing the plate in a dilute NaOH solution to produce a porous structure. A second copper plate was placed on top of the coated surface, and their edges were vacuum brazed to form a sealed enclosure. The enclosed volume was evacuated and partially filled with water to form a heat pipe. The heat pipe was centrally heated from its bottom and cooled along its top outer edge. Three liquid filling ratios and six heat fluxes from 2.5 W/cm2 to 15 W/cm2 were investigated. A decreasing lateral thermal resistance for an increasing applied heat flux was noted for all filling ratios until central dry-out. Central dry-out corresponds to the point where the evaporation rate outpaces the wicking of the working fluid at the centre of the heat pipe. Dry-out of the central wick results in a large thermal resistance compared to the pre-dry-out condition. Delayed dry-out onset was noted for increasing working fluid filling ratios. In the pre-dry-out condition, a peak average radial thermal conductivity of 920 W/m K was noted for a 65% filling ratio, and 7.5 W/cm2 applied heat flux. A model was generated to calculate dry-out of the thermally sprayed porous wick for a given filling ratio and applied heat flux. The present research represents two highly novel advances in heat pipe technology. The first is the development of a new innovative manufacturing technique for the generation of a porous wick structure within a heat pipe. This new manufacturing technique enables the production of large metal vapour chambers with complex 3D geometries. When applied in conjunction with copper compatible working fluids, this techniques facilitates the realization of skin thermal conductors. Second, the fabrication of an ultra-large flat plate heat pipe that is significantly larger than that previously reported in the literature is demonstrated.en
dc.format.extent115030en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.ispartofseriesApplied Thermal Engineering;
dc.relation.ispartofseries171;
dc.rightsYen
dc.subjectThermal sprayen
dc.subjectHeat pipeen
dc.subjectSpray coatingen
dc.subjectVapour chamberen
dc.subjectHeat spreaderen
dc.titleA novel ultra-large flat plate heat pipe manufactured by thermal sprayen
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/gibbonm3
dc.identifier.rssinternalid221166
dc.identifier.doi10.1016/j.applthermaleng.2020.115030
dc.rights.ecaccessrightsopenAccess


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