Air entrainment and dynamic contact angles in hydrodynamics of liquid coating

M. N. Esmail, M. T. Ghannam

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15 Citations (Scopus)


The dynamic contact angles and the phenomenon of entrainment of air bubbled in liquid coating processes are investigated by experimental measurements in which liquid viscosity was varied. The technique consists of using a continuously rotating liquid roller, which is submerged in a liquid pool. The test liquids are glycerol solutions with viscosities in the range 197 < μ < 748 mPa.s. The capillary length (σ/ρg)½ is used as a characteristic dimension. The dynamic contact angle is shown as a function of the capillary number and physical properties number. Dimensional correlations for air entrainment criteria are reported for moderate capillary numbers Ca < 2.

Original languageEnglish
Pages (from-to)197-203
Number of pages7
JournalThe Canadian Journal of Chemical Engineering
Issue number2
Publication statusPublished - Apr 1990
Externally publishedYes


  • air entrainment
  • contact angles
  • liquid coating
  • three‐phase contact lines

ASJC Scopus subject areas

  • General Chemical Engineering


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