Boiling up of jets of superheated ethanol-water solutions |
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Authors: | A V Reshetnikov A V Vinogradov V N Begletsov V N Skokov V P Koverda |
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Institution: | (1) Institute of Thermophysics, Ural Division, Russian Academy of Sciences, ul. Amundsena 106, Yekaterinburg, 620016, Russia |
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Abstract: | The stability and evolution of the shapes of jets of strongly superheated aqueous solutions of ethanol flowing out of a high-pressure
chamber are experimentally investigated at various initial parameters. It has been found that a low-boiling liquid causes
shifting to lower temperatures of the boundaries between various kinds of boiling-up jets, such as cylindrical, conical, and
open. Large-scale pulsations of the jet shapes are observed in the temperature range from 454 to 484 K, where the jet completely
breaks down. The conditions for the formation of large-scale low-frequency pulsations with a power spectrum diverging inversely
proportional to the frequency f (1/f spectra) have been revealed. Such fluctuations prove that the flow is unstable and large-scale low-frequency ejections are
possible. |
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