Misting of non-Newtonian liquids in forward roll coating

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

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Misting of liquids in forward roll coating is a problem under certain conditions. The relaxation time is known to influence misting but the fundamental mechanisms are not clear. A new mechanism for misting of dilute non-Newtonian liquids was proposed based on visualizations with a high-speed camera. With these liquids, filaments were created which sometimes transformed into beads-on-string structures and the beads were ejected as mist droplets when the structures broke. Misting was quantified by measuring sizes of the generated droplets, their count and mass concentration. The measurements were related to elasticity of the solutions through their relaxation times. Small levels of elasticity reduce the amount of misting, but higher levels lead to an increase.

Original languageEnglish (US)
Pages (from-to)1123-1128
Number of pages6
JournalJournal of Non-Newtonian Fluid Mechanics
Volume166
Issue number19-20
DOIs
StatePublished - Oct 2011

Bibliographical note

Funding Information:
Financial support for this work was provided by the Industrial Partnership for Research in Interfacial and Materials Engineering (IPRIME) . We thank W.J. Suszynski for his help in capturing instabilities with the high-speed camera. Thanks are due to undergraduate research participants, Kris Hodgson, John Lund and Brian Kelly who gathered some of the data reported in this work.

Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.

Keywords

  • Boger liquids
  • Dilute polymer solutions
  • Forward roll coating
  • Misting

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