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dc.contributor.authorKarimzadehkhouei, M.
dc.contributor.authorSezen, M.
dc.contributor.authorŞendur, K.
dc.contributor.authorMengüç, Mustafa Pınar
dc.contributor.authorKoşar, A.
dc.date.accessioned2017-10-17T12:28:54Z
dc.date.available2017-10-17T12:28:54Z
dc.date.issued2017
dc.identifier.issn1359-4311en_US
dc.identifier.urihttp://hdl.handle.net/10679/5673
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S1359431117327850
dc.description.abstractIn this study, subcooled flow boiling heat transfer characteristics of nanofluids were investigated at micro scale. For this purpose, the effect of γ-Al2O3 (gamma-alumina) nanoparticles with an average solid diameter of 20 nm was considered. In the experiments, various mass fractions were considered in horizontal smooth stainless steel microtubes with inner and outer diameters of ∼502 µm and ∼717 µm, respectively, at mass fluxes of 1200 and 3400 kg m−2 s−1. Nanoparticles were added to distilled water (base fluid) at five mass fractions (low mass fractions 0.05 wt% and 0.2 wt%; high mass fractions 0.5 wt%, 1 wt% and 1.5 wt%). According to our results, subcooled flow boiling heat transfer coefficients for nanofluids with low mass fractions were nearly the same as those of the pure water. However, heat transfer deteriorated for nanofluids with high mass fractions. Observations of dynamic light scattering measurements for low and high mass fractions before and after the experiments revealed that agglomeration of nanoparticles is an important parameter in deterioration of heat transfer at higher concentrations. Besides, Scanning Electron Microscopy images of microtube inner surfaces showed that deposition of nanoparticles and agglomerated nanoparticles on the inner surface of the microtubes also contributed to the heat transfer deterioration at high mass fractions. Generally, the deterioration in heat transfer beyond a specific mass fraction value was linked to the disturbance in the stability of suspended nanoparticles and deposition of nanoparticles upon boiling.en_US
dc.description.sponsorshipSUNUM; FENS
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.ispartofApplied Thermal Engineering
dc.rightsrestrictedAccess
dc.titleSubcooled flow boiling heat transfer of γ-Al2O3/water nanofluids in horizontal microtubes and the effect of surface characteristics and nanoparticle depositionen_US
dc.typeArticleen_US
dc.peerreviewedyesen_US
dc.publicationstatusPublisheden_US
dc.contributor.departmentÖzyeğin University
dc.contributor.authorID(ORCID 0000-0001-5483-587X & YÖK ID 141825) Mengüç, Pınar
dc.contributor.ozuauthorMengüç, Mustafa Pınar
dc.identifier.volume127en_US
dc.identifier.startpage536en_US
dc.identifier.endpage546en_US
dc.identifier.wosWOS:000413608400051
dc.identifier.doi10.1016/j.applthermaleng.2017.08.041en_US
dc.subject.keywordsSubcooled flow boilingen_US
dc.subject.keywordsHeat transfer coefficienten_US
dc.subject.keywordsAl2O3 nanoparticle/water nanofluiden_US
dc.subject.keywordsNanoparticle depositionen_US
dc.subject.keywordsNanoparticle agglomerationen_US
dc.identifier.scopusSCOPUS:2-s2.0-85027580424
dc.contributor.authorMale1


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