Steady motion of a gas bubble in a liquid

A method is proposed for calculating the velocity of a gas bubble during a steady lift in a liquid, on the assumption that the bubble transmits to the medium an array of weak waves.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 4, pp. 656–662, October, 1973.     

Propagation dynamics of a liquid injected into an aquifer

With the aid of the Phoenics program package the filtration processes in the underground permeable collector upon injection of a liquid into it have been considered. The time dependences of the injected liquid velocity for a real gas-saturated aquifer have been obtained. The indices of using a geothermal cogenerating plant operating on gas-saturated thermal water have been estimated.     

Model of gas bubble breakup in a turbulent liquid flow

A system of equations for evolution of the size spectrum of gas bubbles as a results of their breakup in an isotropic turbulent damped flow of an incompressible liquid is derived and solved numerically.Academic Scientific Complex A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 68, No. 2, pp. 192–204, March–April, 1995.     

Growth rate of a vapor bubble in an underheated liquid

On the basis of model representations developed earlier the author has obtained an analytical solution of the problem of vapor bubble growth on a wall in an underheated liquid. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 73, No. 4, pp. 778–780, July–August, 2000.     

Formation of a gas bubble on a vibrating capillary immersed in a liquid

The formation of a train of bubbles in a low-viscosity liquid is investigated. The dependence of the gas flow rate during formation of the bubble train on the vibrational acceleration of the capillary is determined.Deceased.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 30, No. 4, pp. 665–670, April, 1976.     

Depth of penetration of solid particles injected into a gas flow

The depth of penetration of a spherical particle into a uniform transverse flow was determined experimentally and theoretically for both a continuous medium and a free molecule flow.Translated from Inhenerno-Fizicheskii Zhurnal, Vol. 40, No. 6, pp. 993–996, June, 1981.     

Self-excitation of oscillatory processes when a liquid is injected into a plasma jet

The process of cooling of a wall by a liquid injected into a plasma jet through a circular opening is studied experimentally. Different flow regimes in a vaporliquid system, including self-excited oscillatory regimes associated with the transfer of the region of boiling from the exterior side of the wall into the interior cavity of the casing, were obtained. Self-excited oscillations of the wall temperature are described with the help of approximation formulas.Translated from Inzherno-fizicheskii zhurnal, Vol. 61, No. 4, pp. 650–655, October, 1991.     

Heat and mass transfer in heat pipes with noncondensing gas

An experimental study is described concerning the performance parameters of heat pipes with noncondensing gas. The test results are found to agree closely with calculations.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 2, pp. 254–260, August, 1973.     

Flow of a stream of unevenly heated liquid over a gas bubble at low marangoni numbers

The problem of the thermocapillary convection in an unevenly heated liquid near a gas bubble is solved analytically. Estimates are given for the velocity of drift and the shape of the bubble and the vortex boundary.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 32, No. 2, pp. 251–256, February, 1977.     

Breakup of a highly charged bubble in a dielectric liquid into parts of comparable size

An analysis is made of the conditions for instability of a charged gas bubble in a dielectric liquid. It is shown that unlike a charged droplet, the criterion for instability of a bubble is determined by two dimensionless parameters: the Rayleigh parameter and the ratio of the gas pressure in the parent bubble to the Laplace pressure. Pis’ma Zh. Tekh. Fiz. 23, 60–65 (October 12, 1997)     

Onset of jetting for dispersion of a gas into a liquid

Criteria for determining the conditions for the onset of jetting for a gas dispersing into a liquid are analyzed. The results of an experimental investigation are compared with computed relations.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 40, No. 2, pp. 244–248, February, 1981.     

Rayleigh equation for the growth of a gas bubble under conditions of finite liquid volume

An equation is presented for the growth of a stationary spherical gas bubble in a finite spherical liquid volume, for which the familiar Rayleigh equation is the zero-order approximation. The results of computer solutions of the derived equation and the Rayleigh equation are compared.     

Mechanism of gas bubble shoot-off and motion during spark discharge in liquid

The conditions of the excitation of a pulsed plasma discharge on the surface of a processed metal (copper) sample immersed in a conducting aqueous solution have been studied. Cathode polarization of the metal was provided by a high-voltage capacitor bank (4??F) charged to U = 200?C1100 V after each discharge. It is established that electric breakdown with a duration not exceeding 0.1 ??s is always preceded by the formation of small hydrogen bubbles (with radii r ?? 37?C40 ??m) on the polarized metal surface, which takes about 139?C159 ??s. A mechanism of passivation of the processed metal surface by these hydrogen bubbles, which are synchronously shot off from the electrode surface under the action of the spark discharge, is proposed. Consistent matching of the experimental data and model calculations is used to estimate the main parameters determining the kinetics of bubble detachment from the electrode surface at various voltages U on the capacitor bank.     

Circulation of the solid phase through a vertical gas jet injected into a layer of granular material

A method is developed for determining the mass of particles circulating through a vertical gas jet. On the basis of experimental data dependences are obtained for determining the circulation of particles and the velocities of their motion in the jet.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 37, No. 4, pp. 635–640, October, 1979.     

Realization of high pressures and temperatures in the gas phase of a bubble liquid flowing through a nozzle

A steady flow of a bubble gas-liquid mixture in a nozzle having a circular cross section has been investigated. The possibility of realization of superhigh temperatures and pressures in the gas phase of the mixture in the region near the smallest cross section of the nozzle has been analyzed. The influence of the initial radius of the flow and the volume content of bubbles, determining the volumetric rate of flow of the liquid supplied to the nozzle, on the pattern of the flow has been considered. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 6, pp. 134–137, November–December, 2007.     

The pressure inside a suspended gas bubble

Summary. An integral representation is derived for the pressure inside an inviscid, compressible or incompressible bubble suspended in a Newtonian fluid, in terms of the instantaneous bubble shape and structure of the ambient velocity field. The starting point in deriving this representation is the reciprocal theorem for Navier-Stokes flow, applied for the flow around the bubble and the flow due to a point source situated inside the bubble. The integral representation is used to evaluate the pressure inside a spherical bubble in potential flow to leading order with respect to the Weber number, and the pressure inside a circular bubble in Stokes flow to leading order with respect to the capillary number. The results are consistent with and generalize numerical and analytical solutions derived by previous authors.     

Deflection of a jet injected into a stream

A solution is given for the deflection of the axis of two-dimensional and circular jets by an entraining stream. Design formulas are obtained and compared with experiment.     

Cavitation bubble dynamics in a polar liquid

It is suggested to introduce a new term into the equation describing the cavitation bubble dynamics in a polar liquid that takes into account a finite relaxation rate of dipole molecules of the liquid during rapid collapse of the bubble. It is shown that solutions of the modified equation provide significantly lower values of the thermodynamic parameters of the gas at the end of the collapse, so that thermal mechanisms of the high-energy processes accompanying cavitation cannot be operative. A substantial difference between commonly accepted notions and the proposed physical mechanism of accumulation of the acoustic field energy is demonstrated, whereby the energy is concentrated in the electrostatic field of oriented dipoles rather than in the form of the energy of compressed gas in the cavitation bubble. Experimental data are presented that confirm the proposed model.