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Permanent link (DOI): https://doi.org/10.7939/R3397J

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Estimation of the Evaporation Rate of an Isolated Water Microdroplet Subjected to Infrared Radiative Heating Open Access

Descriptions

Other title
Subject/Keyword
Radiation
Droplets
Evaporation
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Ferraz Albani, Luis A
Supervisor and department
Olfert, Jason (Mechanical Engineering)
Nobes, David (Mechanical Engineering)
Examining committee member and department
Finlay, Warren (Mechanical Engineering)
Olfert, Jason (Mechanical Engineering)
Nobes, David (Mechanical Engineering)
Kostiuk, Larry (Mechanical Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2014-06-20T09:57:57Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
A combined numerical-experimental investigation was performed to study the influence of infrared radiation on the evaporation of a single-component droplet in the range between 10 and 50 micrometers, under different environmental conditions of relative humidity and temperature of air. A numerical model that predicts the evolution of the droplet size with respect to time was developed under the assumptions of steady state evaporation, spherical symmetry, no relative velocity between the droplet and the surroundings, constant material properties, and no temperature gradient inside the droplet. Numerical simulations were generated to obtain plots of droplet diameter with respect to time for droplets with an initial diameter of 50 micrometers under four different conditions of relative humidity (i.e., 0%, 30%, 60%, and 90%), two different air temperatures (i.e., 20 °C and 60 °C), and various radiation intensities (i.e., 0 to 10000 milliwatts per millimeters squared). Experiments were performed using an opto-mechanical rig capable of generating a monodispersed vertical chain of droplets inside a glass flow tube with various conditions of relative humidity and air temperature, in which the size of the droplets was measured using shadowgraphy. The droplet images were collected and processed using a 12X microscopic optical system and commercial software, respectively. An infrared laser beam with a wavelength of 2.8 micrometers was generated and aligned with the vertical droplet chain in order to provide the system with high amounts of infrared radiation at a wavelength in which the liquid water has a high absorptivity. The experimental and numerical results showed good agreement in all cases. It was determined that at elevated magnitudes of incident infrared radiation the evaporation rate of water droplets increases substantially and high amount of vapor content in the surrounding air becomes inconsequential.
Language
English
DOI
doi:10.7939/R3397J
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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