Transition in inclined internally heated fluid layers

Abstract

Non-linear solutions and studies of their stability are presented for flows in a homogeneously heated fluid layer under the influence of a constant pressure gradient or when the mass flux across any lateral cross-section of the channel is required to vanish. The critical Grashof number is determined by a linear stability analysis of the basic state which depends only on the z-coordinate perpendicular to the boundary. Bifurcating longitudinal rolls as well as secondary solutions depending on the streamwise x-coordinate are investigated and their amplitudes are determined as functions of the supercritical Grashof number for various Prandtl numbers and angles of inclination of the layer. Solutions that emerge from a Hopf bifurcation assume the form of propagating waves and can thus be considered as steady flows relative to an appropriately moving frame of reference. The stability of these solutions with respect to three-dimensional disturbances is also analyzed in order to identify possible bifurcation points for evolving tertiary flows.

Divisions: College of Engineering & Physical Sciences > School of Informatics and Digital Engineering > Mathematics
College of Engineering & Physical Sciences > Systems analytics research institute (SARI)
Additional Information: 5th European Thermal-Sciences Conference, 18-21 May 2008, Eindhoven (NL).
Uncontrolled Keywords: non-linear solutions,homogeneously heated fluid layer,constant pressure gradient,critical Grashof number,linear stability analysis,bifurcating longitudinal rolls,secondary,solutions,streamwise x-coordinate,supercritical Grashof number,Prandtl numbers,angles of inclination,Hopf bifurcation
ISBN: 9789038612744
Full Text Link: http://www.euro ... tion/FCV_10.pdf
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PURE Output Type: Chapter
Published Date: 2008-05
Authors: Generalis, Sotos C. (ORCID Profile 0000-0001-7660-0633)
Busse, Friedrich

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