Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/27208
ชื่อเรื่อง: Heat Transfer of Ferrofluid in Fluted Tubes with an Electromagnetic Field
ผู้แต่ง: Siricharoenpanitch A.
Wiriyasart S.
Vengsungnle P.
Naphon N.
Naphon P.
วันที่เผยแพร่: 2022
สำนักพิมพ์: Taylor and Francis Ltd.
บทคัดย่อ: The present study considers the effects of the electromagnetic field and pulsating flow on nanofluids heat transfer and flow characteristics in the three-start helically fluted tube. The experiments are performed using anofluids with the Reynolds number varying from 8000 to 13000, and with an Fe3O4/water nanofluids (Ferrofluid) concentration of 0.005% by volume with and without an electromagnetic field effect. The measured results are verified with the predicted results from the proposed correlations and the published experimental results. As a result of the disturbed flow boundary layer, higher swirling Brownian motion, higher local thermal conductivity, and the mixing of turbulent intensity, the heat transfer performance also increases. For a given pulsating flow of 30 Hz, the Nusselt number enhancement increases significantly to 137.7% and 156.7% for the helical depth ratios of 0.028 and 0.093, respectively. The helically fluted tube with a helical depth ratio of 0.093 and a helical pitch ratio of 0.93 yields the highest Nusselt number improvement. The Nusselt number under the electromagnetic field effect increases by 19.0% and 14.4% for the pulsating flow of 30 Hz and 20 Hz, respectively. Finally, a comprehensive evaluation index is applied to estimate thermo-hydraulic performance. It is found that the comprehensive evaluation index increases with the increasing Reynolds number at first and then decreases as the Reynolds number increases further. © 2022 Taylor & Francis Group, LLC.
URI: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85132667327&doi=10.1080%2f01457632.2022.2068219&partnerID=40&md5=462e1b8f5fe38017ee19a13c7f377111
https://ir.swu.ac.th/jspui/handle/123456789/27208
ISSN: 1457632
Appears in Collections:Scopus 2022

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