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Experimental study of quenching process on a rotating hollow cylinder by one row of impinging jets
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem.ORCID-id: 0000-0002-3315-5610
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem. Division of Energy Systems, Department of Management and Engineering, Linköping University.
2017 (engelsk)Inngår i: 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, 12-15 June, 2017, Iguazu Falls, Brazil, 2017Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Quenching cooling rate of rotary hollow cylinder by one row of water impinging jets has been experimentallystudied. Water jets (d = 8 mm) with sub-cooling 55 to 85°C and Reynolds number 8,006 to 36,738 impinged over rotaryhot hollow cylinder (rotation speed 10 to 70 rpm) with initial temperature 250 to 600°C. Impingement impact angle of row of jets varied between 0 to 135° and jet-to-jet spacing in row patten was 2 to 8d. The results revealed more uniformityon cooling rate of quenching in smaller jet-to-jet spacing (2 and 4d) where wetting front regions are located closer toneighbor jet’s region. By increasing spacing, footprint of annular transition region was highlighted in quenching coolingrate contour. A distinct quenching characteristic was obtained for impingement impact angle of 0° compare to otherangles. With initial temperature above the Leidenfrost temperature, low cooling rate was achieved in film and transitionboiling compare to a steep increase of cooling rate at start of quenching with higher maximum heat transfer for experimentswith initial temperatures less than Leidenfrost temperature. The effect of other parameters on quenching coolingrate was highlighted in film and transition boiling while no significant differences were observed in nucleate boiling.

sted, utgiver, år, opplag, sider
2017.
Emneord [en]
Experimental study, Multiple impinging jets, Rotating surface, Quenching, Transient boiling
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-25131OAI: oai:DiVA.org:hig-25131DiVA, id: diva2:1137356
Konferanse
9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, 12-15 June, 2017, Iguazu Falls, Brazil
Forskningsfinansiär
Swedish Energy Agency
Merknad

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Tilgjengelig fra: 2017-08-31 Laget: 2017-08-31 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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Jahedi, MohammadMoshfegh, Bahram

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