The foam/emulsion analogy in structure and drainage

The often quoted analogy between foams and emulsions is experimentally tested by studying properties after settling and under forced drainage of oil-in-water emulsions of drop size similar as for bubbles generally used in foam experiments. Observations with regard to structure, water fraction and dr...

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Bibliographic Details
Published in:The European physical journal. E, Soft matter and biological physics Soft matter and biological physics, 2004-08, Vol.14 (4), p.381-386
Main Authors: HUTZLER, S, PERON, N, WEAIRE, D, DRENCKHAN, W
Format: Article
Language:English
Subjects:
Biophysics - methods
Chemistry
Colloidal state and disperse state
Emulsions - chemistry
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
Models, Statistical
Oils
Physical Phenomena
Physics
Rheology
Sodium Dodecyl Sulfate - chemistry
Solvents
Surface Tension
Surface-Active Agents - chemistry
Water - chemistry
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Summary:The often quoted analogy between foams and emulsions is experimentally tested by studying properties after settling and under forced drainage of oil-in-water emulsions of drop size similar as for bubbles generally used in foam experiments. Observations with regard to structure, water fraction and drainage wave properties confirm the expected similarity in the low flow rate range. However, while for foams a convective circulation on the scale of the container sets in for values of water fraction exceeding about 0.2, no such convection is found in emulsions. Here instabilities are only encountered at water fractions of about 0.4, close to the void fraction of random packings of spheres. These take on the form of descending pulses of increased water fraction and lead to the transition from a frozen to a locally agitated structure.
ISSN:1292-8941
1292-895X
DOI:10.1140/epje/i2003-10152-1