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Experimental and numerical investigation on hydrothermal performance of nanofluids in micro-tubes
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
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2020 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 193, article id 116658Article in journal (Refereed) Published
Abstract [en]

Nanoscale solid particles suspended in a base liquid are a new class of nano-engineered colloidal suspension, defined with a coined name of nanofluids (NFs). The effect of dispersing nanoparticles (NPs) on the hydraulic and thermal (hydrothermal) performance of the conventional coolants is a matter of importance in many applications. This work experimentally and numerically presents the effect of different parameters, including the concentration and size of the NPs, on two primary parameters, namely heat transfer coefficient and friction factor in a microtube. The numerical modeling of colloidal suspensions was conducted based on single-phase as well as Eulerian-Mixture two-phase approaches and showed a good agreement with experimental results. The numerical results displayed that the suspended NPs remarkably increased the convective heat transfer coefficient as well as friction factor by as much as 42% and 22% (in NP concentration range of 1%–9%, and NP size range of 13–130 nm and Reynolds number of 400) respectively. Besides, two new correlations were developed based on the results obtained from experimentally validated models to predict the hydrothermal response of NFs in the laminar regime. Moreover, correlations were successfully created to predict the Nusselt number and friction factor of nanofluids, with ±8% and ±5% agreement between numerical data and predictions, respectively.

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 193, article id 116658
Keywords [en]
Friction factor, Heat transfer coefficient, Laminar flow, Micro-tube, Modeling, Nanofluids, Nanoparticles, Forecasting, Friction, Heat convection, Heat transfer coefficients, Models, Reynolds number, Sols, Suspensions (fluids), Colloidal suspensions, Concentration ranges, Convective heat transfer Coefficient, Conventional coolants, Friction factors, Micro-tubes, Numerical investigations, Nanofluidics, experimental study, fluid composition, heat transfer, hydrothermal activity, nanoparticle, numerical method, performance assessment
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-267952DOI: 10.1016/j.energy.2019.116658ISI: 000518699000024Scopus ID: 2-s2.0-85076825686OAI: oai:DiVA.org:kth-267952DiVA, id: diva2:1417486
Note

QC 20200329

Available from: 2020-03-29 Created: 2020-03-29 Last updated: 2020-03-29Bibliographically approved

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Behi, MohammadrezaMirmohammadi, Seyed Aliakbar

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