Condensation and Freezing Front Propagation on Surfaces With Topographic and Chemical Modifications
Zhong, Yongfang
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https://hdl.handle.net/2142/83912
Description
Title
Condensation and Freezing Front Propagation on Surfaces With Topographic and Chemical Modifications
Author(s)
Zhong, Yongfang
Issue Date
2008
Doctoral Committee Chair(s)
Jacobi, Anthony M.
Georgiadis, John G.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
Experimental data on propagation were reported for a freezing front crossing on micro-grooved substrates in a 200mum-to-400mum-thick water layer. The speed of a freezing front oscillates locally over the grooves, with propagation retarded in troughs and accelerated on crests. When the water freezing point moves at a constant speed, the speed of a freezing front on crests can be more than 8 times the speed in troughs. A numerical estimation shows that the difference of the propagation speeds on crests and in troughs is mainly caused by thermal effects.
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