Evaporation of metastable liquid

Kozlov, B M; Krynetskiǐ, B. B.; Samokhin, A. A.

doi:10.1070/qe1975v004n11abeh011862

Cited by 2 publications

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“…This increase in the frequency corresponds to the superheating of the dielectric liquid by the quantity ΔT = 1-2 • C [9]. Equation (6) implies the following estimate of the time of liquid superheating: t layer = ρ 0 c p ΔT /(μJ).…”

Section: Spinodal Decomposition Of the Liquid And Breakup Of Its Surfmentioning

confidence: 99%

“…For the theoretical description of the vaporization regime of interaction of radiation with matter, it is necessary to consider nonlinear phenomena such as phase transition of the liquid to vapor and its expansion into the atmosphere. For metallic liquids, a thermal model of surface molecular vaporization has been developed which is valid up to the regime of hydrodynamic failure of material [3], whereas for dielectric liquids having low thermal conductivity and laser radiation absorption coefficient, there is a wide range of radiation intensities 10 3 -10 7 W/cm 2 in which explosive boiling [4] is observed.A physical model for explosive boiling was proposed in [5,6] and it consists of the following. During surface vaporization, the pressure on the liquid surface p(T 0 ) is always lower than the saturated vapor pressure p s (T 0 ).…”

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confidence: 99%

“…A physical model for explosive boiling was proposed in [5,6] and it consists of the following. During surface vaporization, the pressure on the liquid surface p(T 0 ) is always lower than the saturated vapor pressure p s (T 0 ).…”

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confidence: 99%

“…According to (6), in the initial period of time, the temperature at the point of maximum decreases due to cooling of the boundary, and then, because of heating by the laser radiation, it reaches the initial value. The total time of this process, which characterizes the pulsating vaporization period and the thickness of the broken surface layer, are equal, respectively, to…”

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Model of explosive pulsed vaporization of dielectric liquids by intense laser irradiation of their surfaces

Sentsov¹

2008

J Appl Mech Tech Phy

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The mechanism of explosive vaporization interaction of laser radiation with matter is studied theoretically. It is shown that, in dielectric liquids with a free surface, periodic explosive boiling is possible if the laser radiation intensity exceeds the rate of heat transfer from the region of laser radiation absorption. Analytical expressions are obtained to estimate the pulsating boiling period and the thickness of the surface liquid layer dispersed by fluctuation vapor bubbles during each boiling. The degree of absorption of laser radiation by the aerosol formed above the liquid surface is estimated.Key words: dielectric liquid, laser radiation, liquid vaporization, spinodal decomposition of the liquid.Laser irradiation of a liquid gives rise to the optoacoustic effect consisting of sound generation in the liquid. The mechanisms of optical generation of sound and their efficiency depend on the laser radiation intensity. At low intensities, the thermal mechanism of sound generation occurs, in which radiation absorption leads to thermal expansion of the medium, which is a sound source. At considerable intensities of laser radiation, a vaporization mechanism occurs consisting of the phase transition of the liquid to vapor and sound generation in the liquid due to the recoil of the vapor jet. At even higher radiation intensities, a plasma regime of interaction is observed, in which breakdown occurs above the liquid surface and the plasma region is expanded, leading to sound generation in the liquid.The thermal mechanism has been extensively studied both theoretically and experimentally [1,2]. The efficiency of the thermal mechanism of transformation of laser energy to acoustic energy is about 0.001%. The theoretical papers dealing with the thermal mechanism consider the nonlinear effects related to heating-induced variation in the thermodynamic properties of the medium and accounting for the nonlinear terms in the hydrodynamic equations, the influence of inhomogeneity of the medium, etc.In the vaporization regime of interaction, the efficiency of transformation of laser radiation energy to acoustic energy is two to three orders of magnitude higher than that in the thermal regime. For the theoretical description of the vaporization regime of interaction of radiation with matter, it is necessary to consider nonlinear phenomena such as phase transition of the liquid to vapor and its expansion into the atmosphere. For metallic liquids, a thermal model of surface molecular vaporization has been developed which is valid up to the regime of hydrodynamic failure of material [3], whereas for dielectric liquids having low thermal conductivity and laser radiation absorption coefficient, there is a wide range of radiation intensities 10 3 -10 7 W/cm 2 in which explosive boiling [4] is observed.A physical model for explosive boiling was proposed in [5,6] and it consists of the following. During surface vaporization, the pressure on the liquid surface p(T 0 ) is always lower than the saturated vapor pressure p s (T 0 ). Since p...

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Section: Spinodal Decomposition Of the Liquid And Breakup Of Its Surfmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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