Novosibirsk State Technical University (HHT, MTF, assistant)
employee from 01.01.2011 to 01.01.2026
Russian Federation
employee from 01.01.2000 to 01.01.2026
Russian Federation
The paper presents the results of an experimental study on the effect of horizontal liquid layer height on the characteristics of pressure pulsations during evaporation/boiling under reduced pressure conditions. The experiments were carried out in a thermosiphon setup simulating the operation of a diffusion pump evaporator. N-dodecane was used as the working fluid, selected as a model medium for vacuum oil. The pressure range studied was from 33 Pa to 20 kPa, and the liquid layer height varied from 1.4 to 40 mm. It was found that at pressures above 1 kPa, nucleate boiling occurs, whereas in the pressure range below 1 kPa, nucleate boiling is absent. It is shown that in the pressure range below 1 kPa, the amplitude of pressure pulsations increases with increasing liquid layer height, reaching 110 Pa at a height of 20 mm. A further increase in the layer height does not lead to a significant increase in pressure pulsations. Using the fast Fourier transform, power spectra of pressure pulsations were obtained, demonstrating a power-law dependence of the form 1/f α with characteristic peaks. These peaks correspond to the frequencies of explosive boiling-up and the processes occurring during explosive boiling. A correspondence has been established between the frequencies estimated from time realizations of pressure pulsations and the peaks in the power spectra.
THIN LIQUID LAYER, HEAT TRANSFER, BOILING, EVAPORATION, SUBATMOSPHERIC PRESSURE, PULSATIONS, DIFFUSION PUMP, N-DODECANE, POWER SPECTRUM
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