Large-scale fluctuations during a boiling crisis and during the boiling up of a superheated liquid jet

Abstract

The results of an experimental study of pulsation processes during the transition from nucleate to film boiling on a wire heater and in transient regimes of boiling up of a liquid jet flowing from a high-pressure chamber are presented. An analogy in the behavior of the boiling curve and in the boiling liquid flow rate dependence on the pressure in a thermodynamically strongly nonequilibrium flow regime is shown. The similarity of pulsation processes in a vapor jet during crisis boiling of water on a wire heater and in a jet of a superheated liquid (water and ethanol) under the conditions of the transient boiling regime is noted. Conditions under which the power spectra of local and integral fluctuations changed in inverse proportion to the frequency in the low-frequency region (1/f fluctuations) have been established. A high correlation coefficient between local and integral pulsation characteristics both in a vapor jet on a wire heater and in a jet of a boiling liquid has been revealed.