The effect of pre‐wetting on dynamic contact angles

M. T. Ghannam, M. N. Esmail

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A roll‐coating experimental system is used to study the effect of pre‐wetting on dynamic contact angles, the interfacial displacement depth, and the associated phenomenon of air entrainment. The system consists of a roll, which is horizontally rotating in a liquid pool. The dynamic contact angle is recorded by a macrophotography system. The test liquids are glycerol solutions with viscosities in the range 104 < μ < 748 mPa · s. The value of (μV/ρg)0.5 is taken as the characteristic length to be used in the dimensionless relationships which correlate experimental measurements. The effect of base layer entry angle into the liquid pool on the dynamic contact angles and other flow parameters is studied. Comparison is made with measurements in dry tape‐coating and other pre‐wet roll–coating systems.

Original languageEnglish
Pages (from-to)408-412
Number of pages5
JournalThe Canadian Journal of Chemical Engineering
Issue number2
Publication statusPublished - Apr 1992
Externally publishedYes


  • air entrainment
  • contact angles
  • interfacial displacement depth
  • pre‐wet coating
  • roll‐coating

ASJC Scopus subject areas

  • General Chemical Engineering


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