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oai:www.ideals.illinois.edu:2142/93070 2023-07-11 col_2142_5131 com_2142_5130

Jacobi, Anthony M. Wong, Mei Yung 2016-11-10T18:43:03Z 2016-11-10T18:43:03Z 2018-11-11T10:15:28Z 2016-07-18 2016-08 This study presents a numerical analysis of laminar convective heat transfer in a rectangular channel with different configurations of delta-winglet vortex generators (VG). A low and high Reynolds number case of 225 and 1123 is simulated which is representative of the lower and upper limits of the air velocity range between 1-5 m/s in a typical air-cooled condenser (ACC) system. The effects of interacting and non-interacting vortices on the Nusselt number and pressure drop are observed for the two Reynolds numbers. The low-Re cases flow cleaner through the channel, pressure drop is slightly lower for the array in comparison to a straight-line formation for two VG pairs; however, the increase in Nusselt number is higher in the straight-line configuration. For the high-Re cases the vortices generated are stronger and persist longer and interactions between vortices in the array configuration lead to Nusselt number increases, but a higher pressure drop results. The straight-line configuration has an almost equal increase in Nusselt number and pressure drop. Recommendations are made to further explore the VG placement using different Reynolds numbers for constructive augmentation of the vortices as the vortex behavior and interactions are mainly a affected by the inlet flow velocity. Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-08-01 The student, Mei Yung Wong, accepted the attached license on 2016-07-15 at 15:49. The student, Mei Yung Wong, submitted this Thesis for approval on 2016-07-15 at 15:55. This Thesis was approved for publication on 2016-07-18 at 11:18. DSpace SAF Submission Ingestion Package generated from Vireo submission #9969 on 2016-11-10 at 12:25:29 Made available in DSpace on 2016-11-10T18:43:03Z (GMT). No. of bitstreams: 2 WONG-THESIS-2016.pdf: 2387029 bytes, checksum: 30f982589e1cadecd4bdf71509674e59 (MD5) LICENSE.txt: 4210 bytes, checksum: b9a71ed15c429bd2281a6d4a373d45a8 (MD5) Previous issue date: 2016-07-18 Embargo set by: Seth Robbins for item 95493 Lift date: 2018-11-10T18:43:22Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 95493 on 2018-11-11T10:15:28Z. application/pdf http://hdl.handle.net/2142/93070 en Copyright 2016 Mei Yung Wong Vortex Generators Air-cooled Condenser Delta winglets Vortex generator arrays in air-cooled condensers for power plant applications text text Mechanical Sci & Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Thesis M.S.