Abstract
The influence of mixed convection due to buoyancy for a flow in a uniformly heated horizontal duct is a well-known phenomenon. Experimentally 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 of large-amplitude temporal fluctuations in temperature. The amplitude of these fluctuations depends on their position in the test section, the heat flux supplied to the wall and the fluid velocity. The aim of this paper is to describe these thermal instabilities, and to simulate them utilizing a low-dimension model which shows the nonlinear dynamic of the system.
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