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oai:www.ideals.illinois.edu:2142/29706 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-11-20T20:09:30Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Wang_Kuo-Ting.pdf: 1950213 bytes, checksum: efdbf4d6028389ef1af8e53e5e68a050 (MD5) Made available in DSpace on 2012-02-06T20:12:07Z (GMT). No. of bitstreams: 2 Wang_Kuo-Ting.pdf: 1950199 bytes, checksum: 1381fc1934c77ff8e13551d1b20aa2f5 (MD5) license.txt: 4057 bytes, checksum: f2899b354d396e998bf98dfc266b44dc (MD5) Brewster, M. Quinn Brewster, M. Quinn Georgiadis, John G. Jacobi, Anthony M. Riemer, Nicole Wang, Kuo-Ting 2012-02-06T20:12:07Z 2012-02-06T20:12:07Z 2014-08-29T10:00:44Z 2012-02-06T20:12:07Z 2011-12 The radiative relaxation mechanism of water between its different phases is studied to understand an uncommon radiation phenomenon observed in the first-order phase-transition process of water. This kind of radiation is often referred to as phase-transition radiation, whose nature is different from the Planckian radiation because its strength can be even stronger than blackbody radiation at the same temperature. In the theoretical approach of this study, analytical thermodynamic models for condensed-state water are presented to study its energetic behaviors at temperatures ranging from a few degrees K to near the critical point. Changes of energetic behaviors of water molecules during phase-transitions are of special interest and are linked to the direct emission of infrared radiation. A two-level energy transition model is proposed to investigate the characteristic radiation during vapor condensation, leading to a newly defined absorption coefficient for phase-transition radiation in the radiative transfer equation. The reported characteristic radiation for vapor condensation at wavelength 4-8 micron meter is attributed to the radiative relaxation with one hydrogen-bond formation in liquid-water during vapor condensation. In addition to the theoretical modeling, optical measurements are also included in this study to examine the energy transmission characteristics in vapor-liquid mixtures of water in the 3-5 micron meter spectral range. Results from the infrared transmission experiments and the associated theoretical predictions by the Monte Carlo radiative transfer analysis suggest that the probability for condensation radiation occurrence is one out of 20 million collisions between water-vapor molecules and liquid-water droplets. Item marked as restricted to the 'Administrator' Group (id=1) by Sarah Shreeves (sshreeve@illinois.edu) on 2012-08-29T22:10:31Z Item is restricted until 2014-08-29T22:10:31Z Restriction data tranferred 2014-07-01T11:35:04-05:00 Original Data Group with Access Administrator Release Date: 2014-08-29 17:10:31 UTC Reason: Requested by author. ETD. Limited Restriction Lifted for Item 29948 on 2014-08-29T10:00:44Z. http://hdl.handle.net/2142/29706 en Copyright 2011 Kuo-Ting Wang water vapor ice infrared radiation phase transition condensation Monte Carlo emission absorption transmission stimulated emission spontaneous emission cell theory infrared spectroscopy characteristic radiation characteristic wavelength radiative relaxation radiative transfer Phase-transition radiation of water Mechanical Sci & Engineering 1917 Mechanical Engineering 0133 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Mechanical Enginerng -UIUC 10KS0133PHD