Low frequency pressure waves in a vapor-liquid medium with a fixed layer of spherical particles

Покусаев, Б. Г.; Tairov, E. A.; Vasilyev, S. A.

doi:10.1134/s1063771010030073

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…The breakdown mechanism differs from the 'thermal': total breakdown time, and decreases by two orders of magnitude to 15-20 μs (figures 2(g)-(h)) compared to 1.5 ms in water without microbubbles at the same conductivity and applied voltage; plasma channel propagation speed increases by almost three orders of magnitude up to 1.2-1.3 km s −1 and may overcome the speed of sound. In such bubbly liquids the speed of sound is strongly dependent upon the volumetric gas content [30,31]. It is about 0.3-0.6km s −1 in air-water medium at gas content of about 0.1%-0.2% realized in present experiments, and is lower than the channel speed.…”

Section: Case(ii): Volumetric Bubbles Effectcontrasting

confidence: 50%

Pulsed electrical breakdown of conductive water with air bubbles

Panov¹,

Vasilyak²,

Vetchinin³

et al. 2019

Plasma Sources Sci. Technol.

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In this study we summarize our experimental results regarding the influence of artificial bubbles, introduced in bulk liquid and deposited on the surface of electrodes, on the pulsed electrical breakdown of water with conductivity of 35 and 330 μS cm −1 in 'pin-to-rod' geometry. A comparative study is completed for four different configurations of bubbles: (1)no bubbles at all; (2)bubbles only in bulk liquid; (3)bubbles only on the surface of electrodes; (4)bubbles both in bulk liquid and on the surface. Both volumetric and surface bubbles were revealed to change the breakdown mechanism at the near-breakdown voltage in two different ways, based on plasma channel propagation speed.

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Section: Case(ii): Volumetric Bubbles Effectcontrasting

confidence: 50%

Pulsed electrical breakdown of conductive water with air bubbles

Panov¹,

Vasilyak²,

Vetchinin³

et al. 2019

Plasma Sources Sci. Technol.

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“…12 For example, a mixture EOS is usually chosen on the basis of its capability of reproducing the experimentally measured sound speed, yet available experimental data, though already sparse, are mostly concerned with liquid/gas mixtures, and reliable data for liquid/vapor mixtures probably do not exist. 14,15 Here, the term "vapor" refers to a phase that condenses to a liquid phase upon the increase of pressure at constant temperature (i.e., just water vapor), whereas a gas phase contains noncondensable species at this temperature (e.g., nitrogen or oxygen). Another example is the variety of equations that relate liquid/vapor mixture viscosity with bulkphase viscosity and vapor-volume fraction.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In this approach, the governing equations describing the conservation laws are written for the homogeneous mixture, and an analytic or tabulated equation of state (EOS) for this mixture is needed for system closure. , In addition, a set of equations describing the properties of the mixture, such as viscosity, are often needed as well. , However, the mixture EOS and property equations utilized in practice are rarely validated through experiments for multiphase systems . For example, a mixture EOS is usually chosen on the basis of its capability of reproducing the experimentally measured sound speed, yet available experimental data, though already sparse, are mostly concerned with liquid/gas mixtures, and reliable data for liquid/vapor mixtures probably do not exist. , Here, the term “vapor” refers to a phase that condenses to a liquid phase upon the increase of pressure at constant temperature (i.e., just water vapor), whereas a gas phase contains noncondensable species at this temperature (e.g., nitrogen or oxygen). Another example is the variety of equations that relate liquid/vapor mixture viscosity with bulk-phase viscosity and vapor-volume fraction. , These equations are mostly not derived directly from experimental viscosity data but estimated using experimental data for pressure drops of two-phase flow.…”

Section: Introductionmentioning

confidence: 99%

Molecular Simulations Probing the Thermophysical Properties of Homogeneously Stretched and Bubbly Water Systems

et al. 2019

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Molecular simulations in the canonical ensemble were performed to probe a variety of thermophysical properties of both homogeneously stretched and bubbly water systems at a temperature of 298 K. Two types of water models, the four-site TIP4P/2005 model and the coarse-grained single-site mW model, were investigated. Simulations for the computationally efficient mW model were carried out using cubic simulation boxes with linear dimensions of 4, 8, 16, and 32 nm, whereas 4, 6, and 8 nm boxes were considered for the TIP4P/2005 model. Various thermophysical properties, including pressure (P), potential energy (U), residual isochoric heat capacity (C V,res ), viscosity (η), and self-diffusion coefficient (D self ), were calculated for densities ranging from 800 kg/m 3 to the saturated liquid density (ρ sat ). Following two simulation protocols starting either from a homogeneous configuration or from a heterogeneous configuration with a single spherical cavity, spinodal cavitation (SC) and bubble collapse (BC) points were located separately. This behavior of a fluid in a box of fixed volume is analogous to the hysteresis observed for adsorption−desorption isotherms of a subcritical fluid in a mesoporous adsorbent. As the system size is increased, both BC and SC points are shifted to larger densities. In terms of thermophysical properties, qualitatively similar trends are observed for the mW and TIP4P/2005 models. As the system approaches the SC point from ρ sat , P decreases to a large negative value, U, C V,res , and η increase, and D self decreases. Upon cavitation, the system undergoes a relaxation as signaled by step changes in these properties. In the heterogeneous (bubbly) region, a decrease in the density leads to relatively slower increases in P and U and a slow decrease in η, but C V,res does not exhibit significant changes, whereas a significant decrease in D self is observed only for the mW model and boxes larger than 8 nm. For the system sizes investigated here, the thermophysical properties at a given density cannot be simply estimated from a linear combination of the corresponding properties taken from the saturated liquid and vapor phases. For the bubbly phases, the Young−Laplace relation is found to hold well, whereas the Stokes−Einstein relation is not obeyed.

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“…A detailed description of the layout of the experiment is given in the paper [11]. A detailed description of the layout of the experiment is given in the paper [11].…”

Section: Resultsmentioning

confidence: 99%

“…New experimental results were presented in [10,11], concerning low amplitude pressure perturbation propagation in low velocity vapor-liquid flow in cylindrical channel through layer of closed-packed spherical particles, fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium acoustic velocity in vapor-liquid mixture in layer of spherical particles

et al. 2014

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Theoretical and experimental study of acoustic velocity in vapor-liquid mixture that contained close-packed layer of spherical particles was performed with respect to non-stationary heat transfer between mixture and particles in compression half-wave. Theoretical model allows to explain the decay of equilibrium acoustic velocity compared to its adiabatic value in case of increasing of void fraction in the mixture. Calculated results are in agreement with experimental data, obtained in vertical channel with vapor-liquid filtration with close-packed layer of spherical particles of borosilicate glass, steel, and lead. Key words: vapor-liquid mixture, layer of spherical particles, the equilibrium acoustic velocity, non-stationary heat transfer Pokusaev, B. G., et al.: Equilibrium Acoustic Velocity in Vapor-Liquid .

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Low frequency pressure waves in a vapor-liquid medium with a fixed layer of spherical particles

Cited by 12 publications

References 5 publications

Pulsed electrical breakdown of conductive water with air bubbles

Pulsed electrical breakdown of conductive water with air bubbles

Molecular Simulations Probing the Thermophysical Properties of Homogeneously Stretched and Bubbly Water Systems

Equilibrium acoustic velocity in vapor-liquid mixture in layer of spherical particles

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