2026-09-23T06:09:23Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/16174 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Christensen, Kenneth T. Mejia Alvarez, Ricardo 2010-05-19T18:39:50Z 2010-05-19T18:39:50Z 2010-05-19T18:39:50Z This effort explores the impact of dilute polymer solutions on the turbulence characteristics in a submersed liquid impinging-jet configuration. Turbulent impinging jets are commonly used in technological applications such as drying, scouring, cooling or heating due to an enhancement in transport characteristics in the impingement region under certain nozzle-to-wall configurations. Previous efforts have identified significant turbulence modifications in the presence of dilute concentrations of polymer (i.e., the Toms effect) in both bounded (suppression) and unbounded (either suppression or enhancement) flows. To this end, particle-image velocimetry measurements were made for an axisymmetric turbulent impinging jet with a nozzle-to-wall distance H/D=6.8 and Reynolds number Re_D=23000. Measurements were made for both plain water and dilute polymer solutions of polyethylene oxide at concentrations of 50 and 100 ppm. The mean and turbulence characteristics of these three flows are contrasted and it is observed that the 50 ppm case yields a slight enhancement of the turbulence while the 100 ppm case exhibits clear suppression of the turbulence. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-04-29T16:23:50Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Mejia Alvarez_Ricardo.pdf: 10767972 bytes, checksum: 36ea0b75a88802a59b55187a60275e81 (MD5) Made available in DSpace on 2010-05-19T18:39:50Z (GMT). No. of bitstreams: 3 Mejia Alvarez_Ricardo.pdf: 10767972 bytes, checksum: 36ea0b75a88802a59b55187a60275e81 (MD5) MejiaAlvarez_Ricardo.pdf: 10767976 bytes, checksum: e83aadefb8e58e1e406e269733dbcef8 (MD5) license.txt: 4062 bytes, checksum: 4d96aeb14245755083352a87dfb1bf91 (MD5) http://hdl.handle.net/2142/16174 en Copyright 2010 Ricardo Mejia Alvarez impinging jet polymers Particle-image velocimetry (PIV) Polymer-induced turbulence modifications in an impinging jet 2010-5 Mechanical Sci & Engineering 1917 Theoretical & Applied Mechans 0242 University of Illinois at Urbana-Champaign Thesis M.S. PHD:Theor&Appl Mechanics -UIUC 10KS0242PHD