Mechanistic studies of single bubble growth using interface-tracking methods
File(s)
Accepted version
Author(s)
Hansch, Susann
Walker, Simon
Narayanan, Chidambaram
Type
Journal Article
Abstract
The growth of a vapour bubble at a heated surface involves various fluid mechanics, heat transfer and phase change phenomena. In this paper we present recent work under the auspices of the NURESAFE project aimed at developing mechanistic modelling of this. Evaporation at the curved surface of the bubble requires evaluation of the unsteady heat conduction within the surrounding liquid, coupled to an appropriate phase change model at the vapour–liquid interface. Issues around the development and implementation of such a phase change model are addressed. For low-pressure bubbles, however, a large fraction of the total evaporation takes place from the “microlayer”; a thin layer of water coating the heated substrate, which is left behind as the bubble expands. This microlayer evaporation requires careful, sub-grid modelling, as heat fluxes through the thin layer are very high. In particular, we demonstrate here the need both for modelling of the conjugate heat transfer within the substrate, and the importance of the incorporation of evaporative thermal resistance at the vapour–liquid interface. Despite the important role it plays in bubble growth, the mechanisms governing the formation, and resulting dimensions, of this microlayer are very little understood. We finish with a presentation of some early results attempting to investigate mechanistically the hydrodynamics of microlayer formation.
Date Issued
2017-09-01
Date Acceptance
2016-08-03
Citation
Nuclear Engineering and Design, 2017, 321, pp.230-243
ISSN
0029-5493
Publisher
Elsevier
Start Page
230
End Page
243
Journal / Book Title
Nuclear Engineering and Design
Volume
321
Copyright Statement
© 2016 Elsevier B.V. All rights reserved. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000411468100020&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
EP/K007777/1
EP/M018261/1
EP/M018733/1
Subjects
Science & Technology
Technology
Nuclear Science & Technology
HEAT-TRANSFER COEFFICIENT
HIGH-SPEED VIDEO
INFRARED THERMOMETRY
MICROLAYER STRUCTURE
HORIZONTAL SURFACE
THIN-FILM
NUCLEATE
WATER
DYNAMICS
MODEL
Publication Status
Published
Date Publish Online
2016-08-20