Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/100/14229
Title: Misting of Newtonian Liquids in Forward Roll Coating
Authors: OWENS, MS
VINJAMUR, M
SCRIVEN, LE
MACOSKO, CW
Keywords: High-Speed
Instability
Fluids
Films
Flow
Issue Date: 2011
Publisher: AMER CHEMICAL SOC
Citation: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,50(6)3212-3219
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.
URI: http://dx.doi.org/10.1021/ie100747w
http://dspace.library.iitb.ac.in/jspui/handle/100/14229
ISSN: 0888-5885
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