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Non-linear effects in a natural circulation evaporator: geysering coupled with manometer oscillations

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Abstract

Investigations at ambient pressure and water for working fluid using a steam-heated single tube natural circulation evaporator revealed a novel type of geysering. This mode appears during start-up of the evaporator and changes to density wave oscillation type I with rising heating steam pressure and decreasing subcooling of the working fluid. The observed operational state is dominated by two interacting phenomena: geysering and manometer oscillations. The periodically appearing geyser feeds kinetic energy into the system whereby the damped manometer oscillation is maintained. Due to manometer oscillations backflow occurs during the incubation phase. Hence, preheated liquid is stored in the feeding line with temperatures greater than the saturation temperature at ambient pressure. This leads to an extreme violent vapour generation and expulsion after onset of the geyser as a result of flashing with maximum mass fluxes 20–60 times higher than the average value. By a moderate increase in pressure drop coefficient of the feeding line, the operational behaviour changes from geysering coupled with manometer oscillation to density wave oscillation type I respectively to a steady mode.

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  1. Lehrstuhl für Fluidmechanik und Prozessautomation, Technische Universität München, 85350, Freising, Germany

    A. Baars & A. Delgado

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  1. A. Baars
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  2. A. Delgado
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Correspondence to A. Baars.

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Baars, A., Delgado, A. Non-linear effects in a natural circulation evaporator: geysering coupled with manometer oscillations. Heat Mass Transfer 43, 427–438 (2007). https://doi.org/10.1007/s00231-005-0069-3

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