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SUMMARY:Effect of fibres on wet foams - Ketoja\, JA (VTT)
DTSTART:20140228T114500Z
DTEND:20140228T120500Z
UID:TALK51152@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-authors: Ahmad M. Al-Qararah (VTT)\, Tuomo Hjelt (VTT)\, An
 tti Koponen (VTT)\, Ali Harlin (VTT) \n\nWet foam is an excellent carrier 
 phase to produce particle or fibre structures. Thus\, it is important to k
 now how particles or fibres affect foam properties. We have studied these 
 effects for foams generated by axially agitated mixing with 60-80% air con
 tent [1]. Onset of a flow macro-instability is observed at high rotation s
 peeds both with and without cellulose fibres. The air content of the foam 
 is strongly affected by this instability. By describing the effect of the 
 air content on the stability of bubble interfaces\, we explain the bubble 
 size for broad ranges of rotation speed and surface tension. Added fibres 
 usually reduce the bubble size for a fixed rotation speed. After the flow 
 macro-instability\, not only the air content but also the bubble size incr
 eases with reduced surface tension. Beyond the instability\, the effect of
  fibres on foam properties becomes minor. \n\n1) A. M. Al-Qararah\, T. Hje
 lt\, A. Koponen\, A. Harlin\, J. A. Ketoja\, Bubble size and air content o
 f wet fibre foams in axial mixing with macro-instabilities\, Colloids and 
 Surfaces A: Physicochem. Eng. Aspects 436 (2013) 1130-1139. \n
LOCATION:Seminar Room 1\, Newton Institute
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