Dynamics of a reactive micellar oil-water interface in a flowing liquid column

Zahra Niroobakhsh, Andrew Belmonte

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present an experimental investigation of instabilities due to the formation of interfacial micellar material around a flowing liquid column. By injecting an aqueous surfactant solution (cetylpyridinium chloride) into a reservoir of organic oil (oleic acid), we observe a wide variety of morphological states, dependent on the imposed flow rate and surfactant concentration. Interfacial rheology measurements show that this material is viscoelastic. The states observed include connected and disconnected falling droplets, a moving pipelike column with various surface wave instabilities, and a straight cylindrical pipe which undergoes a buckling instability. These states result from the competition between surface tension type effects, the geometry of the flow, and the growth of the micellar material at the interface.

Original languageEnglish (US)
Pages (from-to)111-122
Number of pages12
JournalJournal of Non-Newtonian Fluid Mechanics
Volume261
DOIs
StatePublished - Nov 1 2018

Fingerprint

Oils
oils
Surfactant
Liquid
Water
Surface-Active Agents
Liquids
Surface active agents
liquids
surfactants
Cetylpyridinium
water
oleic acid
Rheology
Oleic acid
Surface Waves
Oleic Acid
buckling
Buckling
Experimental Investigation

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics

Cite this

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abstract = "We present an experimental investigation of instabilities due to the formation of interfacial micellar material around a flowing liquid column. By injecting an aqueous surfactant solution (cetylpyridinium chloride) into a reservoir of organic oil (oleic acid), we observe a wide variety of morphological states, dependent on the imposed flow rate and surfactant concentration. Interfacial rheology measurements show that this material is viscoelastic. The states observed include connected and disconnected falling droplets, a moving pipelike column with various surface wave instabilities, and a straight cylindrical pipe which undergoes a buckling instability. These states result from the competition between surface tension type effects, the geometry of the flow, and the growth of the micellar material at the interface.",
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Dynamics of a reactive micellar oil-water interface in a flowing liquid column. / Niroobakhsh, Zahra; Belmonte, Andrew.

In: Journal of Non-Newtonian Fluid Mechanics, Vol. 261, 01.11.2018, p. 111-122.

Research output: Contribution to journalArticle

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AB - We present an experimental investigation of instabilities due to the formation of interfacial micellar material around a flowing liquid column. By injecting an aqueous surfactant solution (cetylpyridinium chloride) into a reservoir of organic oil (oleic acid), we observe a wide variety of morphological states, dependent on the imposed flow rate and surfactant concentration. Interfacial rheology measurements show that this material is viscoelastic. The states observed include connected and disconnected falling droplets, a moving pipelike column with various surface wave instabilities, and a straight cylindrical pipe which undergoes a buckling instability. These states result from the competition between surface tension type effects, the geometry of the flow, and the growth of the micellar material at the interface.

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