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Geometric optimization of a double pipe heat exchanger with combined vortex generator and twisted tape: A CFD and response surface methodology (RSM) study
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-5976-2697
2020 (English)In: Thermal Science and Engineering Progress, ISSN 2451-9049, Vol. 18, article id 100514Article in journal (Refereed) Published
Abstract [en]

In this research, a numerical investigation is done on the effect of employing the new combined vortex generators, the twisted tape turbulator and Al2O3-H2O nanofluid as the involved base fluid. Such study is carried out on the behavior of the heat transfer rate and the pressure drop of a double pipe heat exchanger. Accordingly, the response surface methodology (RSM) grounded on the central composite design (CCD) is used for acquiring the optimized geometry of the combined vortex generator and twisted tape turbulator. In order to have the maximum Nusselt number and minimum friction factor, twenty cases with different pitches ratio Pil=0.09-0.18, angles (θ=0-30°) and Reynolds numbers (Re = 5000-20000) are examined. The Results show that the pitch ratio has a predominant effect on the Nusselt number and the friction factor, which causes an efficiency increase up to five times compared to the original one. In addition, by decreasing the angle of the vortex generators in the new combined turbulator, both Nusselt number and the friction factor are increased.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 18, article id 100514
Keywords [en]
Central composite design (CCD) technique, Combined vortex generator and twisted tape turbulator, Double pipe heat exchanger, Pressure drop, Response surface methodology (RSM)
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-276310DOI: 10.1016/j.tsep.2020.100514ISI: 000621593000015Scopus ID: 2-s2.0-85083169381OAI: oai:DiVA.org:kth-276310DiVA, id: diva2:1442700
Note

QC 20200617

Available from: 2020-06-17 Created: 2020-06-17 Last updated: 2022-06-26Bibliographically approved

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Saffari Pour, Mohsen

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
  • html
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  • asciidoc
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