2026-09-22T11:02:10Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/16954 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Jacobi, Anthony M. Gupta, Deep 2010-08-31T20:01:53Z 2010-08-31T20:01:53Z 2012-09-07T16:43:30Z 2010-08-31T20:01:53Z 2010-08 Condensate on the air-side surface of flat-tube air-cooling heat exchangers can result in several adverse effects on the overall thermal-hydraulic performance. In order to improve the performance of compact heat exchangers under wet-surface conditions, promoting the drainage of condensed water is critical. Drainage channels on tube walls might provide a robust solution to promote condensate drainage from compact heat exchangers. A quantitative and qualitative evaluation of the effectiveness of drainage channels on the condensate retention characteristics of compact flat-tube louver-fin heat exchangers is presented. Various geometries of drainage channels are engraved on surrogate tubes in contact with fin stock. Two fin designs are tested using a dynamic dip testing method, and four designs are tested in a small wind tunnel apparatus. Data from the quantitative results and the visualization tests show that the drainage channels reduce the condensate retention for all the fin designs tested, except one. Fin structure plays an important role in determining the condensate retention behavior and hence the effect of drainage channels. Other important parameters, such as fin gap and louver gap, which have an effect on the condensate retention behavior are identified. The results include a comparison of drainage channel geometry and dimensions, over a range of incoming air velocity and relative humidity, and at different sample inclinations. The maximum effect obtained is a 27% reduction in steady- state retention. A method to implement drainage channels in full-size heat exchangers is suggested and an analysis suggests heat transfer can be improved by 12% while pressure drop is reduced by 9%. Item withdrawn by Rebecca Bryant (rabryant@illinois.edu) on 2010-07-14T21:06:24Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Gupta_Deep.docx: 2814593 bytes, checksum: 5ebcbd3fa12c7fc07fe1460614dc3126 (MD5) Gupta_Deep.pdf: 3310219 bytes, checksum: 926f0ebbb6ec23d7b0c788d83110724e (MD5) Made available in DSpace on 2010-08-31T20:01:53Z (GMT). No. of bitstreams: 4 Gupta_Deep.pdf: 3310219 bytes, checksum: 926f0ebbb6ec23d7b0c788d83110724e (MD5) Gupta_Deep.docx: 2814593 bytes, checksum: 5ebcbd3fa12c7fc07fe1460614dc3126 (MD5) 1_Gupta_Deep.pdf: 3308982 bytes, checksum: 97905e802f289159a8d21066582e099b (MD5) license.txt: 4059 bytes, checksum: e85b0618e383b37b7323caa5ea44bee8 (MD5) Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2010-08-31T20:04:45Z Item is restricted until 2012-08-31T20:04:44Z Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2012-09-07T16:43:30Z Item was in collections: University of Illinois Dissertations and Theses (ID: 204) Dissertations and Theses - Mechanical Science and Engineering (ID: 675) No. of bitstreams: 5 Gupta_Deep.pdf: 3310219 bytes, checksum: 926f0ebbb6ec23d7b0c788d83110724e (MD5) Gupta_Deep.docx: 2814593 bytes, checksum: 5ebcbd3fa12c7fc07fe1460614dc3126 (MD5) 1_Gupta_Deep.pdf: 3308982 bytes, checksum: 97905e802f289159a8d21066582e099b (MD5) license.txt: 4059 bytes, checksum: e85b0618e383b37b7323caa5ea44bee8 (MD5) 1_Gupta_Deep.pdf.txt: 268157 bytes, checksum: 566fba1e5761629b24c013357370cbef (MD5) Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2012-09-07T16:43:30Z http://hdl.handle.net/2142/16954 en Copyright 2010 Gupta Deep Condensate Automotive Evaporator Drainage Channels Louver-fin Air-side condensate management: Drainage channels in heat exchangers Mechanical Sci & Engineering 1917 Mechanical Engineering 0133 University of Illinois at Urbana-Champaign Thesis M.S. MS:Mechanical Engineerng -UIUC 10KS0133MS