dielectrophoretic instabilities in the taylor-couette system

Paper number

IAC-08.A2.2.9

Author

Ms. Marlene Smieszek, Université de Havre, France

Coauthor

Dr. Olivier Crumeyrolle, Université du Havre, France

Coauthor

Prof. Innocent Mutabazi, Université du Havre, France

Coauthor

Prof. Christoph Egbers , BTU Cottbus, Germany

Year

2008

Abstract

We investigate the development of thermoconvective and centrifugal instabilities in a  dielectric liquid confined in a vertical cylindrical annulus with a differential rotation submitted to a radial temperature gradient and a radial alternative electrical field.  This study is an extension of a previous investigation in annulus without electrical field [1,2]. The problem has a large parameter space: the Taylor number, the Prandtl number, the thermal Grashof  number, the electric Grashof number, the aspect ratio and radius ratio [3,5]. This particular problem is of practical interest since it is well known that dielectrophoretic effect can enhance heat transfer through liquids. We will examine both the Earth and microgravity conditions in case when only the inner cylinder is rotating while the outer is fixed.  



[1] V. Lepiller,  A. Prigent, F. Dumouchel  & I. Mutabazi,  Transition to trubulence in a tall annulus submitted to a radial temperature gradient, Phys. 
Fluids 19, 054191 (2007).

[2] V. Lepiller, A. Goharzadeh, A. Prigent & I. Mutabazi, Weak temperature gradient effect on the stability of the circular Couette flow, Eur. Phys. J. B 61, 445-455 (2008). 

[3] P.J. Stiles and M. Kogan, Stability of cylindrical Couette flow of a radially polarized dielectric liquid in a radial temperature gradient, Physica A 197, 583-592 (1993).

[4] M. Takashima, Electrohydrodynamic instability in a dielectric fluid between two coaxial cylinders, Q.J. Mech. Appl. Math. Vol XXXIII, Pt 1, 93-103 (1980). 

[5] M. Travnikov, H.J. Rath, ch. Egbers, Stability of natural convection between spherical shells: energy theory, Int. J. Heat Mass Trans. 45, 4227-4235 (2002). 

Abstract document

IAC-08.A2.2.9.pdf

Manuscript document

IAC-08.A2.2.9.pdf (🔒 authorized access only).

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