Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Rolling, penetration and evaporation of alcohol-water drops on coarse and fine hydrophobic powders

    Access Status
    Fulltext not available
    Authors
    Whitby, C.
    Bian, X.
    Sedev, Rossen
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Whitby, C. and Bian, X. and Sedev, R. 2013. Rolling, penetration and evaporation of alcohol-water drops on coarse and fine hydrophobic powders. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 436: pp. 639-649.
    Source Title
    Colloids and Surfaces A: Physicochemical and Engineering Aspects
    DOI
    10.1016/j.colsurfa.2013.07.041
    ISSN
    0927-7757
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/54414
    Collection
    • Curtin Research Publications
    Abstract

    Agglomeration of hydrophobic powders using aqueous solutions is an important technology. The outcome is linked to the particle wettability, but the mechanisms are not well-understood. We present a fundamental study of the early stages of agglomeration. Drops of alcohol-water mixtures were deposited onto three hydrophobic powders: hydrophobised glass beads (spherical, 90-106 µm), coal dust (angular shape, 90-106 µm) and molybdenite powder (angular shape, 1-20 µm). Their wettability was manipulated through the surface tension of the liquid, which was varied by the alcohol-water ratio. On coarse powders (glass beads and coal dust) the droplet either penetrates into the porous bed (at low surface tensions and contact angles), or sits on top and evaporates (at higher surface tensions and contact angles). Particles spontaneously coat drops of intermediate surface tension. The coating slows evaporation and remains as a dry agglomerate after evaporation. Drops that do not penetrate into the fine powder beds (molybdenite) spontaneously roll away, even when deposited carefully. The reason is that the powder surface behaves like a superhydrophobic one. Rolling drops collect hydrophobic particles along their path. After rolling, the partially coated drop evaporates in the same way as on coarser powders.

    Related items

    Showing items related by title, author, creator and subject.

    • Spontaneous liquid marble formation on packed porous beds
      Whitby, C.; Bian, X.; Sedev, Rossen (2012)
      The encapsulation of aqueous and organic solvents with particles used to form liquid marbles implies there are attractive interactions between the particles and those different liquids. This is often masked, however, by ...
    • Numerical investigation into the evaporation dynamics of drop-on-drop collisions over heated wetting surfaces
      Guggilla, G.; Pattamatta, A.; Narayanaswamy, Ramesh (2018)
      The present study aims at the numerical investigation of drop-on-drop impingement over heated surfaces. Drop-on-drop impact has been found to be one of the basic processes in spray cooling applications. A two-phase solver ...
    • Effect of addition of whey protein isolate on spray-drying behavior of honey with maltodextrin as a carrier material
      Shi, Q.; Fang, Zhongxiang; Bhandari, B. (2013)
      The efficiency of two drying carriers, namely whey protein isolate (WPI) and maltodextrin (MD), alone or in combination, was evaluated during spray-drying of honey. No powder was recovered when pure honey was spray-dried. ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.