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Numerical study of heat transfer in laminar and turbulent pipe flow with finite-size spherical particles
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0003-4328-7921
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-4346-4732
2018 (English)In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 71, p. 189-199Article in journal (Refereed) Published
Abstract [en]

Controlling heat and mass transfer in particulate suspensions has many applications in fuel combustion, food industry, pollution control and life science. We perform direct numerical simulations (DNS) to study the heat transfer within a suspension of neutrally buoyant, finite-size spherical particles in laminar and turbulent pipe flows, using the immersed boundary method (IBM) to account for the solid fluid interactions and a volume of fluid (VoF) method to resolve the temperature equation both inside and outside the particles. Particle volume fractions up to 40% are simulated for different pipe to particle diameter ratios. We show that a considerable heat transfer enhancement (up to 330%) can be achieved in the laminar regime by adding spherical particles. The heat transfer is observed to increase significantly as the pipe to particle diameter ratio decreases for the parameter range considered here. Larger particles are found to have a greater impact on the heat transfer enhancement than on the wall-drag increase. In the turbulent regime, however, only a transient increase in the heat transfer is observed and the process decelerates in time below the values in single-phase flows as high volume fractions of particles laminarize the core region of the pipe. A heat transfer enhancement, measured with respect to the single phase flow, is only achieved at volume fractions as low as 5% in a turbulent flow.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 71, p. 189-199
Keywords [en]
Finite-size particles, Heat transfer, Particulate flows, Pipe flows
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-227551DOI: 10.1016/j.ijheatfluidflow.2018.04.002ISI: 000435428900016Scopus ID: 2-s2.0-85045214851OAI: oai:DiVA.org:kth-227551DiVA, id: diva2:1206549
Funder
Swedish e‐Science Research Center
Note

QC 20180517

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-07-02Bibliographically approved

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Niazi Ardekani, MehdiBrandt, L.uca

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Niazi Ardekani, MehdiBrandt, L.uca
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MechanicsLinné Flow Center, FLOWSeRC - Swedish e-Science Research Centre
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