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dc.contributor.authorO'Shaughnessy, Seamusen
dc.date.accessioned2022-10-25T14:54:27Z
dc.date.available2022-10-25T14:54:27Z
dc.date.issued2022en
dc.date.submitted2022en
dc.identifier.citationP.S. Kumavat, S. Alimohammadi, S.M. O'Shaughnessy, A computational conjugate heat transfer study of a rectangular minichannel undergoing sinusoidal flow pulsations, International Journal of Thermal Sciences, 182, 2022, 107790en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/101490
dc.descriptionPUBLISHEDen
dc.description.abstractThe development of current and next generation high performance electronic devices has led to smaller components in more densely packed spaces. The increasing power levels have resulted in ever-increasing heat flux densities which necessitates the evolution of new liquid-based heat exchange technologies. Pulsating flow in single-phase cooling systems is viewed as a potential solution to the problems involving high heat flux densities. A review of published literature indicates a lack of time-resolved and space-resolved links between the hydrodynamic pulsating characteristics and associated heat transfer perturbations. The scope of this work involves the development of a validated three-dimensional conjugate heat transfer computational model to investigate hydrodynamically and thermally fully developed pulsating flows in a heated rectangular minichannel. Simulations were performed for a sinusoidal waveform with a fixed pulsation amplitude for varying pulsation frequencies in the range of 0.02 Hz to 25 Hz, corresponding to Womersley numbers in the range of 0.5 18.33. Low pulsation frequencies exhibited the well known parabolic profile for the fluctuating hydrodynamic and thermal parameters, i.e., velocity, wall shear, and wall temperature. As a result, the axial pressure gradient, velocity, and wall shear stress profiles were in phase and similar results were obtained for the oscillating wall and bulk fluid temperatures. For the inertia dominated high frequency flows, an increase in axial pressure gradient leads to a phase lag of /2 when compared with the velocity and wall shear profiles. The shorter time period pulsations exhibit unique attributes in the form of flow reversal effects at local near wall regions. High near wall thermal gradients were observed as a result of stronger viscous effects due to a narrowing thermal boundary layer; consequently the transverse diffusion of heat was ineffective. A phase lag and a subsequent drop in the peak magnitudes existed between the oscillating bulk and wall temperatures for high frequency flows. Fluctuations in near wall heat flux profiles showed a dependency on the imposed pulsation frequencies. For the chosen pulsation profile and frequencies, the overall time averaged thermal performance indicates that pulsating flow performs worse than steady flow for a flow rate amplitude of 1. The highest thermal performance was achieved for while maintaining a low friction factor.en
dc.format.extent107790en
dc.relation.ispartofseriesInternational Journal of Thermal Sciencesen
dc.relation.ispartofseries182en
dc.rightsYen
dc.subjectPulsating flowen
dc.subjectMinichannelsen
dc.subjectHydrodynamic studyen
dc.subjectHeat transfer enhancementen
dc.subjectNumerical analysisen
dc.titleA computational conjugate heat transfer study of a rectangular minichannel undergoing sinusoidal flow pulsationsen
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/oshaugseen
dc.identifier.rssinternalid247135en
dc.identifier.doihttp://dx.doi.org/10.1016/j.ijthermalsci.2022.107790en
dc.rights.ecaccessrightsopenAccess
dc.identifier.orcid_id0000-0001-6567-3378en


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