Liquid slip/stick over hydrophobic/hydrophilic surfaces and their implications in coating processes

N. Dongari

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Fluid slip has been observed experimentally in micro- and nanoscale liquid flow devices by several investigators. While observations of fluid slip continue to expand, the generating mechanism responsible for fluid slip is not well understood and indeed generalized mathematical formulation is not available. In the present paper, the author gave an attempt to explain the generating mechanism for the fluid slip on hydrophobic surface. The importance of the present theory lies in the fact that it obviates the need to impose the ad hoc Newtons slip at the fluid-wall interface and also the pre-assumption of thin gas layer close to the wall. Surface interactions with the liquid/fluid at molecular scale are incorporated together with the phase field theory to accurately predict the phase of the fluid close to the wall, which is imperative to accurately determine the fluid slip close to the wall. It is noticed that the incorporation of these molecule-surface interactions have significant effect on the resulting coating windows on both hydrophobic and hydrophilic substrates, however it is more predominant for the hydrophobic one.
Original languageEnglish
Pages (from-to)450-453
Number of pages4
JournalChemical Engineering and Processing: Process Intensification
Volume50
Issue number5-6
DOIs
Publication statusPublished - May 2011

Keywords

  • bead mode slot coaters
  • slip
  • hydrophobic substrates
  • micro-coating
  • phase filed theory
  • liquid slip/stick
  • hydrophobic/hydrophilic
  • surfaces
  • implications
  • coating processes

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