2026-09-23T02:14:23Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/99255 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Brewster, Quinn McNichols, Ezra Owen 2018-03-13T15:28:42Z 2018-03-13T15:28:42Z 2020-03-14T09:15:12Z 2017-12-12 2017-12 This thesis explores how thermal radiation affects water droplet growth in the 20 to 100 μm size range. The theory of mass and energy transfer involving thermal radiation for a single droplet is presented. This theory is then extended to predict droplet growth for a given droplet distribution exposed to a controlled radiative sink. In the model, mass and energy transfer between the droplets and their surroundings are considered. The theoretical model predicts that droplets above approximately 2 μm will experience growth by condensation while smaller droplets will experience evaporation. An experiment was also conducted to measure the effect thermal radiation has on a droplet distribution and was compared to calculations from the theoretical model. Experimental data shows droplet growth occurring at a much higher rate than theoretical predictions. This leads the author to believe either the theoretical model is ignoring another growth mechanism or there is a limiting assumption being implemented in the model. Droplet growth is shown, theoretically and experimentally, to be in agreement with the time scales of droplet growth observed in nature. The time for a small droplet to achieve the size of a rain drop is predicted in this model to be on the order of minutes. Ignoring thermal radiation results in a time scale on the order of days rather than minutes. Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-12-01 The student, Ezra McNichols, accepted the attached license on 2017-12-11 at 16:23. The student, Ezra McNichols, submitted this Thesis for approval on 2017-12-11 at 16:28. This Thesis was approved for publication on 2017-12-12 at 17:05. DSpace SAF Submission Ingestion Package generated from Vireo submission #11943 on 2018-03-13 at 09:57:45 Made available in DSpace on 2018-03-13T15:28:42Z (GMT). No. of bitstreams: 2 MCNICHOLS-THESIS-2017.pdf: 2617897 bytes, checksum: fd7cd62bd17a1f166710e5fed08e62d1 (MD5) LICENSE.txt: 4211 bytes, checksum: ec45c40e6dd6854617ffb43cac219c3c (MD5) Previous issue date: 2017-12-12 Embargo set by: Seth Robbins for item 105219 Lift date: 2020-03-13T15:28:52Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 105219 on 2020-03-14T09:15:12Z. application/pdf http://hdl.handle.net/2142/99255 en Copyright 2017 Ezra McNichols Water Droplet Radiation Water droplet growth enhancement through thermal radiation text text Mechanical Sci & Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Thesis M.S.