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Title

Nonlinear stability of mixed convection flow under non-Boussinesq conditions part 2: mean flow characteristics

Author(s)

Suslov, Sergey A.;  Paolucci, Samuel

Abstract

Based on amplitude expansions developed in Part 1 (Suslov & Paolucci 1999), we examine the mean flow characteristics of non-Boussinesq mixed convection flow of air in a vertical channel in the vicinity of bifurcation points for a wide range of temperature differences between the walls, and Grashof and Reynolds numbers. The constant mass flux and constant pressure gradient formulations are shown to lead to qualitatively similar, but quantitatively different, results. The physical nature of the distinct shear and buoyancy disturbances is investigated, and detailed mean flow and energy analyses are presented. The variation of the total mass of fluid in a flow domain as disturbances develop is discussed. The average Nusselt number and mass flux are estimated for supercritical regimes for a wide range of governing parameters.

Publication type

Journal article

Source

Journal of Fluid Mechanics, Vol. 398 (1999), pp. 87-108

Publication year

1999

FOR Code(s)

0203 Classical Physics

Keyword(s)

Convection flows;  Flow modelling;  Flow stability;  Grashof numbers;  Landau equations;  Nonlinear theory;  Non-Boussinesq conditions;  Reynolds numbers

Publisher

Cambridge University Press

ISSN

0022-1120

Publisher URL

http://dx.doi.org/10.1017/S0022112099006229

Copyright

Copyright © 1999 Cambridge University Press. Published version of the paper reproduced here in accordance with the copyright policy of the publisher.

Full text

Peer reviewed