{"title":"Heat transfer coefficient measurements in the thermal boundary layer of microchannel heat sinks","authors":"Mehrdad Mehrvand, S. Putnam","doi":"10.1109/ITHERM.2016.7517588","DOIUrl":null,"url":null,"abstract":"This study describes the use of optical pump-probe diagnostics to characterize the heat transfer coefficient (HTC) in a developing thermal boundary layer in a microchannel. We use a differential form of the anisotropic time-domain thermoreflectance (TDTR) technique to measure the HTC as a function of fluid flow rate (or Reynolds number, Re). The testing environment/geometry consists of single-phase, degassed water flowing in a rectangular microchannel (hydraulic diameter Dh ≅ 480 μm) with local spot heating by the pump TDTR laser beam. Relative to the HTC measured with non-flowing (static) fluids, we find a 30% increase in the HTC for single-phase water flowing at Re ~ 1800.","PeriodicalId":426908,"journal":{"name":"2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2016-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ITHERM.2016.7517588","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
This study describes the use of optical pump-probe diagnostics to characterize the heat transfer coefficient (HTC) in a developing thermal boundary layer in a microchannel. We use a differential form of the anisotropic time-domain thermoreflectance (TDTR) technique to measure the HTC as a function of fluid flow rate (or Reynolds number, Re). The testing environment/geometry consists of single-phase, degassed water flowing in a rectangular microchannel (hydraulic diameter Dh ≅ 480 μm) with local spot heating by the pump TDTR laser beam. Relative to the HTC measured with non-flowing (static) fluids, we find a 30% increase in the HTC for single-phase water flowing at Re ~ 1800.
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