Two-phase air-water flows: scale effects in physical modeling

Pfister, Michael and Chanson, Hubert (2014) Two-phase air-water flows: scale effects in physical modeling. Journal of Hydrodynamics, 26 2: 291-298. doi:10.1016/S1001-6058(14)60032-9

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Author Pfister, Michael
Chanson, Hubert
Title Two-phase air-water flows: scale effects in physical modeling
Journal name Journal of Hydrodynamics   Check publisher's open access policy
ISSN 1001-6058
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/S1001-6058(14)60032-9
Open Access Status DOI
Volume 26
Issue 2
Start page 291
End page 298
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 3104 Condensed Matter Physics
2210 Mechanical Engineering
2211 Mechanics of Materials
2611 Modelling and Simulation
Abstract Physical modeling represents probably the oldest design tool in hydraulic engineering together with analytical approaches. In free surface flows, the similitude based upon a Froude similarity allows for a correct representation of the dominant forces, namely gravity and inertia. As a result fluid flow properties such as the capillary forces and the viscous forces might be incorrectly reproduced, affecting the air entrainment and transport capacity of a high-speed model flow. Small physical models operating under a Froude similitude systematically underestimate the air entrainment rate and air-water interfacial properties. To limit scale effects, minimal values of Reynolds or Weber number have to be respected. The present article summarizes the physical background of such limitations and their combination in terms of the Morton number. Based upon a literature review, the existing limits are presented and discussed, resulting in a series of more conservative recommendations in terms of air concentration scaling. For other air-water flow parameters, the selection of the criteria to assess scale effects is critical because some parameters (e.g., bubble sizes, turbulent scales) can be affected by scale effects, even in relatively large laboratory models.
Keyword Air entrainment
Hydraulic structures
Morton number
Physical modeling
Scale effects
Two-phase flow
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP120100481
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 21 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 19 times in Scopus Article | Citations
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