Pumping power and heat transfer rate of converging microchannel heat sinks: errors associated with the temperature dependency of nanofluids

dc.authorid Ilis, Gamze Gediz/0000-0001-8366-5427
dc.authorid Dehghan, Maziar/0000-0003-2106-6300
dc.authorid Dehghan, Maziar/0000-0002-4205-0685
dc.authorid Pourrajabian, Abolfazl/0000-0003-0600-315X
dc.authorscopusid 58304803000
dc.authorscopusid 57211943242
dc.authorscopusid 56472680800
dc.authorscopusid 35105619300
dc.authorscopusid 17346906200
dc.authorscopusid 57223035605
dc.authorwosid Ilis, Gamze Gediz/ABI-6122-2020
dc.authorwosid Rahgozar, Saeed/ABF-9410-2021
dc.authorwosid Dehghan, Maziar/F-8525-2013
dc.authorwosid Dehghan, Maziar/AAV-9337-2020
dc.contributor.author Dehghan, M.
dc.contributor.author Vajedi, H.
dc.contributor.author Daneshipour, M.
dc.contributor.author Pourrajabian, A.
dc.contributor.author Rahgozar, S.
dc.contributor.author Ilis, G. G.
dc.date.accessioned 2024-05-25T12:29:55Z
dc.date.available 2024-05-25T12:29:55Z
dc.date.issued 2020
dc.department Okan University en_US
dc.department-temp [Dehghan, M.; Vajedi, H.; Pourrajabian, A.; Rahgozar, S.] MERC, Dept Energy, Karaj, Iran; [Daneshipour, M.] SOFREN Grp, Puteaux La Defense, France; [Ilis, G. G.] Istanbul Okan Univ, Mech Engn Dept, Istanbul, Turkey en_US
dc.description Ilis, Gamze Gediz/0000-0001-8366-5427; Dehghan, Maziar/0000-0003-2106-6300; Dehghan, Maziar/0000-0002-4205-0685; Pourrajabian, Abolfazl/0000-0003-0600-315X en_US
dc.description.abstract To find the sensitivity and dependence degree of the numerical simulation predictions on the property variations arising from the temperature gradients, a 3D conjugate heat transfer of Al2O3-water nanofluid convecting through rectangular microchannel heat sinks (MCHS) is considered in the present study. The Koo-Kleinstreuer-Li model is adopted to capture the temperature-dependent nature of thermophysical properties of the working nanofluid compared to the pure fluid (i.e., water). Both straight and width-tapered flow passages are studied using finite volume method within the laminar flow regime to see how sensitive are the predictions to the temperature dependency of the thermophysical properties for both the pure base fluid and nanofluid. Results show that the constant property assumption obtains unrealistic results up to 140% for the Reynolds number, which may mislead in predicting the flow regime (laminar/turbulent). The constant property approach predicts the convection heat transfer coefficient and the pumping power, respectively, 31% lower and 33% higher than those of the temperature-dependent property approach. In addition, the present study concludes that the MCHS should be simulated based on the temperature-dependent thermophysical property approach to be more realistic, especially for converging flow passages due to high-temperature gradients and for nanofluids for their induced temperature-dependent properties. The last two issues induced each other and increase the deviation of the predictions based on the constant property assumption. Finally, because of underestimating the heat transfer rate and overestimating the pumping power, the MCHS would be over-designed if one adopts the constant property assumption for conceptual design and the MCHS would perform under inefficient and off-design conditions. en_US
dc.identifier.citationcount 25
dc.identifier.doi 10.1007/s10973-019-09020-y
dc.identifier.endpage 1275 en_US
dc.identifier.issn 1388-6150
dc.identifier.issn 1588-2926
dc.identifier.issue 3 en_US
dc.identifier.scopus 2-s2.0-85075433478
dc.identifier.scopusquality Q1
dc.identifier.startpage 1267 en_US
dc.identifier.uri https://doi.org/10.1007/s10973-019-09020-y
dc.identifier.uri https://hdl.handle.net/20.500.14517/2160
dc.identifier.volume 140 en_US
dc.identifier.wos WOS:000524416200030
dc.identifier.wosquality Q1
dc.language.iso en
dc.publisher Springer en_US
dc.relation.publicationcategory Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı en_US
dc.rights info:eu-repo/semantics/closedAccess en_US
dc.scopus.citedbyCount 27
dc.subject Al2O3-water nanofluid en_US
dc.subject Microchannel heat sink en_US
dc.subject Temperature-dependent thermophysical properties en_US
dc.subject Heat transfer enhancement en_US
dc.subject Converging channel en_US
dc.title Pumping power and heat transfer rate of converging microchannel heat sinks: errors associated with the temperature dependency of nanofluids en_US
dc.type Article en_US
dc.wos.citedbyCount 25

Files