Energetic effects on the stability of viscoelastic Dean flow

U. A. Al-Mubaiyedh, R. Sureshkumar, B. Khomami

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

The influence of energetics on the linear stability of viscoelastic Dean flow of an Oldroyd-B liquid has been investigated. Our analyses show that when the temperatures of inner and outer walls are maintained at constant equal values, viscous heating does not influence the mode selection, i.e. the most dangerous disturbance is axisymmetric and stationary as in the case of isothermal Dean flow. The critical Deborah number increases with increasing Brinkman number indicating that viscous heating stabilizes the flow in this case. When the outer cylinder is kept at a higher temperature than the inner one, the most dangerous eigenmode corresponds to a non-axisymmetric disturbance with azimuthal wave number of one. For Pe<O(104), the critical axial and temporal wave numbers for the non-isothermal flow are similar to those predicted for the isothermal case. This indicates that the critical eigenfamily is an extension of the isothermal family. For Pe>O(105), a new axisymmetric and time-dependent eigenmode with significantly different critical parameters becomes the most dangerous one. Influence of solvent viscosity and gap width on the critical parameters is also investigated. Finally, the thermoelastic mechanisms that influence the flow stability are discussed.

Original languageEnglish (US)
Pages (from-to)277-293
Number of pages17
JournalJournal of Non-Newtonian Fluid Mechanics
Volume95
Issue number2-3
DOIs
StatePublished - Dec 25 2000
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics

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