Mechanisms for the onset of convective instability in foams

B. Embley, P. Grassia

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We introduce new mechanisms for the onset of convective motion in loaded 3D foams. This is done by balancing gravity and capillarity along a liquid-filled channel for a microstructural model of foam drainage; the weight of this non-uniform-area channel is then used to predict the onset of instability. The predictions of these models are not very different from the gravitational model, although they do allow for the concept of localized deformation and shearing of a foam. Comparison is made to existing experimental data by incorporating the dependence of yield stress on liquid fraction, which is found to have a large effect on onset.
Original languageEnglish
Pages (from-to)385-394
Number of pages10
JournalPhilosophical Magazine Letters
Volume86
Issue number6
DOIs
Publication statusPublished - 1 Jun 2006

Fingerprint

foams
Foams
Capillarity
Liquids
liquids
drainage
shearing
Shearing
Drainage
Yield stress
Gravitation
gravitation
predictions

Keywords

  • capillarity
  • gravitation
  • microstructure
  • motion estimation
  • yield stress

Cite this

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abstract = "We introduce new mechanisms for the onset of convective motion in loaded 3D foams. This is done by balancing gravity and capillarity along a liquid-filled channel for a microstructural model of foam drainage; the weight of this non-uniform-area channel is then used to predict the onset of instability. The predictions of these models are not very different from the gravitational model, although they do allow for the concept of localized deformation and shearing of a foam. Comparison is made to existing experimental data by incorporating the dependence of yield stress on liquid fraction, which is found to have a large effect on onset.",
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Mechanisms for the onset of convective instability in foams. / Embley, B.; Grassia, P.

In: Philosophical Magazine Letters, Vol. 86, No. 6, 01.06.2006, p. 385-394.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mechanisms for the onset of convective instability in foams

AU - Embley, B.

AU - Grassia, P.

PY - 2006/6/1

Y1 - 2006/6/1

N2 - We introduce new mechanisms for the onset of convective motion in loaded 3D foams. This is done by balancing gravity and capillarity along a liquid-filled channel for a microstructural model of foam drainage; the weight of this non-uniform-area channel is then used to predict the onset of instability. The predictions of these models are not very different from the gravitational model, although they do allow for the concept of localized deformation and shearing of a foam. Comparison is made to existing experimental data by incorporating the dependence of yield stress on liquid fraction, which is found to have a large effect on onset.

AB - We introduce new mechanisms for the onset of convective motion in loaded 3D foams. This is done by balancing gravity and capillarity along a liquid-filled channel for a microstructural model of foam drainage; the weight of this non-uniform-area channel is then used to predict the onset of instability. The predictions of these models are not very different from the gravitational model, although they do allow for the concept of localized deformation and shearing of a foam. Comparison is made to existing experimental data by incorporating the dependence of yield stress on liquid fraction, which is found to have a large effect on onset.

KW - capillarity

KW - gravitation

KW - microstructure

KW - motion estimation

KW - yield stress

UR - http://www.tandfonline.com/loi/tphl

U2 - 10.1080/09500830600838276

DO - 10.1080/09500830600838276

M3 - Article

VL - 86

SP - 385

EP - 394

JO - Philosophical Magazine Letters

JF - Philosophical Magazine Letters

SN - 0950-0839

IS - 6

ER -