Experimental determination of superheated liquid density by the optical fiber method

Gurashkin, A. L.; Старостин, А. А.; Uimin, A. A.; Yampol'skiy, Aleksandr D.; Ermakov, G. V.; Скрипов, П. В.

doi:10.1134/s181023281303003x

Cited by 6 publications

(4 citation statements)

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“…Thus, the degree of superheating was given by the final pressure value p exp < p s ; the parameter monitored in the experiment was the lifetime of the superheated state prior to its decay by spontaneous boiling-up at given thermodynamic parameters. A practical basis for the detailed verification of the theory of homogeneous nucleation [8], and the measurement of different properties of substances in superheated states [4,[28][29][30] including fuel-in-water emulsions and fuel blends [31], consisted of the determination of the temperature, pressure, and volume of the superheated liquid. To track the rapid boiling processes, a fiber optic sensor is placed in the capillary of the bubble chamber [9,29,32,33].…”

Section: Introductionmentioning

confidence: 99%

“…A practical basis for the detailed verification of the theory of homogeneous nucleation [8], and the measurement of different properties of substances in superheated states [4,[28][29][30] including fuel-in-water emulsions and fuel blends [31], consisted of the determination of the temperature, pressure, and volume of the superheated liquid. To track the rapid boiling processes, a fiber optic sensor is placed in the capillary of the bubble chamber [9,29,32,33]. As an example, Figure 2 shows records of the spontaneous boiling-up signals of hexane carried out using the fiber optic sensor in previous works [9,32,33].…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of the detected phenomenon, a method was developed for activating and studying transient the boiling-up processes across a wide area of superheated states with a precisely defined superheating temperature in the bubble chamber. The method of observing transient processes is described in [29,32]. A light guide in the bubble chamber was used to observe the liquid-vapor transition by changing the reflection signal from the end of the light guide with changes in the density of the medium [9,29,32].…”

Section: Introductionmentioning

confidence: 99%

“…The method of observing transient processes is described in [29,32]. A light guide in the bubble chamber was used to observe the liquid-vapor transition by changing the reflection signal from the end of the light guide with changes in the density of the medium [9,29,32]. Since the speed of the available photodetectors is measured in hundreds of megahertz, it is possible to record processes at nanosecond resolution.…”

Section: Introductionmentioning

confidence: 99%

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Nucleation of a Vapor Phase and Vapor Front Dynamics Due to Boiling-Up on a Solid Surface

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et al. 2023

Energies

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The effect of temperature and pressure on the nucleation of the vapor phase and the velocity of the vapor front in the initial stage of activated boiling-up of n-pentane on the surface of a quartz fiber was studied. Using a developed approach combining the “pump-probe” and laser Doppler velocimetry methods, this velocity was tracked in the course of sequential change in the degree of superheating with respect to the liquid–vapor equilibrium line. The studied interval according to the degree of superheating was 40–100 °C (at atmospheric pressure). In order to spatiotemporally localize the process, the activation of boiling-up at the end of the light guide was applied using a short nanosecond laser pulse. A spatial locality of measurements was achieved in units of micrometers, along with a time localization at the level of nanoseconds. An increase in temperature at a given pressure was found to lead to an increase in the speed of the transition process with a coefficient of about 0.2 m/s per degree, while an increase in pressure at a given temperature leads to a decrease in the transition process speed with a coefficient of 25.8 m/s per megapascal. The advancement of the vapor front velocity measurements to sub-microsecond intervals from the first signs of boiling-up did not confirm the existence of a Rayleigh expansion stage with a constant velocity.

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