Effect of fibres on wet foams

Research output: Contribution to conferenceOther conference contributionScientific

Abstract

Wet foam is an excellent carrier phase to produce particle or fibre structures. Thus, it is important to know how particles or fibres affect foam properties. We have studied these effects for foams generated by axially agitated mixing with 60-80% air content. Onset of a flow macro-instability is observed at high rotation speeds 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 increases with reduced surface tension. Beyond the instability, the effect of fibres on foam properties becomes minor.
Original languageEnglish
Publication statusPublished - 2014
EventFoams and Minimal Surfaces - 12 years on - Cambridge, United Kingdom
Duration: 24 Feb 201428 Feb 2014

Conference

ConferenceFoams and Minimal Surfaces - 12 years on
CountryUnited Kingdom
CityCambridge
Period24/02/1428/02/14

Fingerprint

foams
bubbles
fibers
air
interfacial tension
cellulose

Keywords

  • foam
  • fibre
  • mixing
  • air content
  • bubble size
  • flow

Cite this

Ketoja, J., Al-Qararah, A., Hjelt, T., Koponen, A., & Harlin, A. (2014). Effect of fibres on wet foams. Foams and Minimal Surfaces - 12 years on, Cambridge, United Kingdom.
Ketoja, Jukka ; Al-Qararah, Ahmad ; Hjelt, Tuomo ; Koponen, Antti ; Harlin, Ali. / Effect of fibres on wet foams. Foams and Minimal Surfaces - 12 years on, Cambridge, United Kingdom.
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abstract = "Wet foam is an excellent carrier phase to produce particle or fibre structures. Thus, it is important to know how particles or fibres affect foam properties. We have studied these effects for foams generated by axially agitated mixing with 60-80{\%} air content. Onset of a flow macro-instability is observed at high rotation speeds 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 increases with reduced surface tension. Beyond the instability, the effect of fibres on foam properties becomes minor.",
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author = "Jukka Ketoja and Ahmad Al-Qararah and Tuomo Hjelt and Antti Koponen and Ali Harlin",
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Ketoja, J, Al-Qararah, A, Hjelt, T, Koponen, A & Harlin, A 2014, 'Effect of fibres on wet foams' Foams and Minimal Surfaces - 12 years on, Cambridge, United Kingdom, 24/02/14 - 28/02/14, .

Effect of fibres on wet foams. / Ketoja, Jukka; Al-Qararah, Ahmad; Hjelt, Tuomo; Koponen, Antti; Harlin, Ali.

2014. Foams and Minimal Surfaces - 12 years on, Cambridge, United Kingdom.

Research output: Contribution to conferenceOther conference contributionScientific

TY - CONF

T1 - Effect of fibres on wet foams

AU - Ketoja, Jukka

AU - Al-Qararah, Ahmad

AU - Hjelt, Tuomo

AU - Koponen, Antti

AU - Harlin, Ali

N1 - Project code: 79706

PY - 2014

Y1 - 2014

N2 - Wet foam is an excellent carrier phase to produce particle or fibre structures. Thus, it is important to know how particles or fibres affect foam properties. We have studied these effects for foams generated by axially agitated mixing with 60-80% air content. Onset of a flow macro-instability is observed at high rotation speeds 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 increases with reduced surface tension. Beyond the instability, the effect of fibres on foam properties becomes minor.

AB - Wet foam is an excellent carrier phase to produce particle or fibre structures. Thus, it is important to know how particles or fibres affect foam properties. We have studied these effects for foams generated by axially agitated mixing with 60-80% air content. Onset of a flow macro-instability is observed at high rotation speeds 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 increases with reduced surface tension. Beyond the instability, the effect of fibres on foam properties becomes minor.

KW - foam

KW - fibre

KW - mixing

KW - air content

KW - bubble size

KW - flow

M3 - Other conference contribution

ER -

Ketoja J, Al-Qararah A, Hjelt T, Koponen A, Harlin A. Effect of fibres on wet foams. 2014. Foams and Minimal Surfaces - 12 years on, Cambridge, United Kingdom.