ERA

Download the full-sized PDF of Drop Removal from Solid Surfaces: Shedding and EvaporationDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R35415

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Graduate Studies and Research, Faculty of

Collections

This file is in the following collections:

Theses and Dissertations

Drop Removal from Solid Surfaces: Shedding and Evaporation Open Access

Descriptions

Other title
Subject/Keyword
Contact angle
Drop adhesion
Drop evaporation
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Chini, Seyed Farshid
Supervisor and department
Amirfazli, Alidad
Examining committee member and department
Secanell Gallart, Marc (Mechanical Engineering)
Bertola, Volfango (University of Liverpool)
Xu, Zhenghe (Chemical Engineering)
Fleck, Brian (Mechanical Engineering)
Mitra, Sushanta (Mechanical Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2013-04-17T09:45:25Z
Graduation date
2013-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Removal of a drop from its substrate may be gradually (e.g. evaporation) or all at once (e.g. shedding). In this thesis, drop adhesion force as a base for understanding the all at once removal of a drop from its substrate, and drop evaporation in room temperature as one of the gradual removal mechanisms are studied in details. The drop adhesion force is found by calculating the summation of surface tension forces along the contact line. The developed model is applicable to any shape drop as long as contact line is convex everywhere. The model requires the value of left and right contact angles observed in the 2-D side view images which was found using the in-house developed software (i.e. SPPF). Regarding the evaporation study, as a first step and to minimize the number of parameters, evaporation of suspended micro-liter drops is studied. Evaporation of such cases is restricted by movement of vapor from the drop surface, and not the phase change. Literature studies assume the evaporation process is steady-state and convection is small (Maxwell assumptions). It is found that none of the two assumptions are valid. However, for the range of parameters for micro-liter drops, the effect of transient term cancels the effect of convection, and Maxwell assumptions yield accurate results. It was also found that buoyancy, which is different from convection, is not a dominant factor on evaporation of drops, and the difference between the evaporation of sessile and pendant drops has a different source (i.e. evaporation modes). Uneven evaporation flux distribution along the sessile drop surface was also studied using an electrostatic analogy (exterior Dirichlet).
Language
English
DOI
doi:10.7939/R35415
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.
Citation for previous publication
S.F. Chini, A. Amirfazli, “A method for measuring contact angle of asymmetric and symmetric drops”, Colloids Surfaces A, 388, 29-37, 2011.

File Details

Date Uploaded
Date Modified
2014-04-29T17:44:10.280+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 5423501
Last modified: 2015:10:12 15:07:19-06:00
Filename: Chini_Seyed Farshid_Spring2013.pdf
Original checksum: 28cf1ac7571f686dc328d4d2b2bc28cc
Well formed: true
Valid: true
Status message: Too many fonts to report; some fonts omitted. Total fonts = 1017
Page count: 204
File language: en-CA
Activity of users you follow
User Activity Date