Misting of Newtonian liquids in forward roll coating

Michael S. Owens, Madhu Vinjamur, L. E. Scriven, C. W. MacOsko

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Misting of Newtonian liquids, in the film-split region of two counter rotating rigid and deformable cylinders was visualized with standard and high-speed cameras. Flow instabilities begin with ribbing and eventually lead to generation of air-borne droplets called mist. As speed was raised, a uniform film thickness evolved into one with ribs, which evolved into continuous sheets of liquid extending downstream of the gap between the cylinders. The edge of each sheet formed a rim whose two ends were attached to the ribs on the cylinders. Still images via high-speed photography revealed a new mechanism for mist generation: the sheets extended downstream, became unstable and ruptured to produce air-borne droplets. A droplet time-of-flight measurement technique quantified the effect of process settings (speed and speed ratio) and material properties (viscosity and surface tension) on droplet size, count, and mass concentration of mist.

Original languageEnglish (US)
Pages (from-to)3212-3219
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume50
Issue number6
DOIs
StatePublished - Mar 16 2011

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