Summary
The unsteady hydromagnetic flow of a viscous incompressible fluid in the presence of a uniform transverse magnetic field in a rotating parallel plate channel with oscillating pressure gradient is investigated. An exact solution of the governing equations for the fully developed flow is obtained in closed form. The solution in dimensionless form contains three parameters: the Hartman NumberM 2,K 2, the reciprocal of the Ekman Number, and ω the frequency of oscillation. The effects of these parameters on the flow field are studied. For large values ofK 2 and ω there arise thin double-decker boundary layers near the plates of the channel and thin boundary layers for largeM 2.
Zusammenfassung
Die instationäre, hydromagnetische Strömung einer viskosen, inkompressiblen Flüssigkeit unter Einwirkung eines homogenen Magnetfelds quer zur Strömungsrichtung in einem durch rotierende, parallele Platten gebildeten Kanal mit oszillierendem Druckgradienten wird untersucht. Es wird eine exakte Lösung der beschreibenden Gleichungen für die voll entwickelte Strömung in geschlossener Form erhalten. In dimensionsloser Darstellung hängt die Lösung von drei Parametern ab: Der HartmanzahlM 2,K 2, dem Reziprokwert der Ekmanzahl und ω, der Frequenz der Schwingung. Die Auswirkungen dieser Parameter auf das Strömungsfeld werden untersucht. Für große Werte vonK 2 und ω entstehen dünne, doppelt gepackte Grenzschichten an den Platten des Kanals und dünne Grenzschichten für großeM 2.
Similar content being viewed by others
References
Hartman, J.: Theory of laminar flow of an electrical conducting fluid in a homogeneous magnetic field. Kgl. Danske Vidensk. Selsk. (Math. Phys. Meddel.)15 (1937).
Agarwal, J. P.: On generalized incompressible Couette flow in hydromagnetics. Appl. Sci. Res9B, 255 (1962).
Soundalgekar, V. M.: On generalized MHD Couette flow with heat transfer. Proc. Nat. Inst. Sci. (India)33A, 264 (1967).
Shercliff, J. A.: Steady motion of conducting fluids in pipes under transverse magnetic fields. Proc. Camb. Phil. Soc.49, 136 (1953).
Chang, C. C., Lundgren, T. S.: Duct flow in magnetohydrodynamics. ZAMP12, 100 (1961).
Chang, C. C., Yen, J. T.: Magnetohydrodynamic channel flow as influenced by wall conductances. ZAMP13, 266 (1962).
Vidyanidhi, V.: Secondary flow of a conducting liquid in a rotating channel. J. Math. Phys. Sci.3, 193 (1969).
Nanda, R. S., Mohanty, H. K.: Hydromagnetic flow in a rotating channel. Appl. Sci. Res.24, 65 (1971).
Puri, P., Kulshrestha, P. K.: Unsteady hydromagnetic boundary layer in a rotating medium, Paper No. 76 APM-24. ASME J. Appl. Mech. (1974).
Soundalgekar, V. M., Pop, I.: Unsteady hydromagnetic flow in a rotating fluid. Bull. Math. de la Soc. Sci. Math. de la R. S. de Roumanie14, 355 (1970).
Hide, R., Roberts, P. H.: Hydromagnetic flow due to an oscillating plane. Reviews of Modern Physics32, 799 (1960).
Debnath, L.: On unsteady magnetohydrodynamic boundary layer in a rotating flow. ZAMM52, 623 (1972).
Debnath, L.: On unsteady hydromagnetic multiple boundary layer in a rotating fluid. The Tensor27, 224 (1973).
Meyer, R. C.: On reducing aerodynamic heat-transfer rates by magnetohydrodynamics techniques. J. Aero/Space Sci.25, 561 (1958).
Greenspan, H. P.: The theory of rotating fluids. Cambridge Univ. Press 1969.
Author information
Authors and Affiliations
Additional information
With 8 Figures
Rights and permissions
About this article
Cite this article
Seth, G.S., Jana, R.N. Unsteady hydromagnetic flow in a rotating channel with oscillating pressure gradient. Acta Mechanica 37, 29–41 (1980). https://doi.org/10.1007/BF01441241
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01441241