Prediction of inception of thermal oscillations and their waveforms in flow of heated subcritical liquids
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A theoretical model is formulated to determine the instability of flow of subcritical liquids supplied from a reservoir to warm pipelines. The model predicts the waveform of the oscillations to get clipped for certain lengths of pipeline and a range of forced convective heating. Clipped oscillations are obtained when the ratio of residence time of flow to the characteristic thermal time varies between about 1 and 10. The role of residence time in the inception of oscillations and in modifying the waveform is ascertained. The ability of the model to predict the boundaries for onset of oscillations and the region of the clipped and full waveforms is discussed.
KeywordsTheoretical Model Thermal Time Convective Heating Full Waveform Thermal Oscillation
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