THERMAL INSTABILITIES IN A MIXED CONVECTION PHENOMENON - NONLINEAR DYNAMICS

Authors
Citation
C. Abid et F. Papini, THERMAL INSTABILITIES IN A MIXED CONVECTION PHENOMENON - NONLINEAR DYNAMICS, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 56(6), 1997, pp. 6735-6744
Citations number
20
ISSN journal
1063651X
Volume
56
Issue
6
Year of publication
1997
Pages
6735 - 6744
Database
ISI
SICI code
1063-651X(1997)56:6<6735:TIIAMC>2.0.ZU;2-A
Abstract
The influence of mixed convection due to buoyancy for a flow in a unif ormly heated horizontal duct is a well-known phenomenon. Experimentall y the overall effect of the heating is characterized by a temperature difference between the top and bottom of a cross section. An increase in the average velocity of the fluid or the heating power leads to an instability phenomenon which manifests itself through the appearance o f large-amplitude temporal fluctuations in temperature. The amplitude of these fluctuations depends on their position in the test section, t he heat flux supplied to the wall and the fluid velocity. The aim of t his paper is to describe these thermal instabilities, and to simulate them utilizing a low-dimension model which shows the nonlinear dynamic of the system.