The onset of the oscillatory behavior of heated channels is studied in terms of the so-called "density effect", consequence of the physical relationship between enthalpy and density of the fluid.nThe threshold equations are derived, after linearization of the equations obtained in Part I [1]. They can be solved rigorously by numerical methods to yield :1. 5a relation between the describing parameters at the onset of oscillations, and 2. the frequency of the oscillations.nBy comparing the results predicted by the model to the experimental behavior of actual systems, the density effect is very often shown to be the actual cause of oscillatory behaviors.
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