The problem of the oscillatory behavior of heated channels is presented in terms of delay-times and a density effect model is proposed to explain the behavior. The density effect is the consequence of the physical relationship between enthalpy and density of the fluid.nNon-linear equations are derived from the model in a dimensionless form.nA description of the mechanism of oscillations is given, based on the analysis of the equations.nAn inventory of the governing parameters is established. At this point of the study, some facts in agreement with the experiments can already be pointed out.
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