Model of fractionation and coalescence of gas bubbles in a turbulent liquid flow

A system of equations for describing the evolution of the size range of gas bubbles as a result of their fractionation and coalescence in an isotropic turbulent decaying flow of incompressible liquid is derived and solved numerically. Outer parameters are found by which one can effectively control the probability distribution of the bubble radii. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 70, No. 6, pp. 958–966, November–December, 1997     

Features of the breakup of jets of a low-viscosity liquid in a subsonic entraining flow of gas

The results of electrocontact measurements are used as a basis for examining the mechanisms (variants) of the breakup of a liquid jet and a dense atomizing jet. The deformational scheme of breakup in an entraining subsonic gas flow is generalized.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 60, No. 1, pp. 24–32, January, 1991.     

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.     

Hydrodynamics of descending turbulent flow of liquid film and gas

Experimental data is presented for the hydrodynamics of a descending annular flow of water and air for a separate flow mode with no separation and entrainment of drops.     

Model of a nonstationary isotropic turbulent flow of a liquid with polymer additives

A closed equation is investigated for a function that describes the evolution in time of the energy distribution of turbulent velocity pulsations over different length scales in an isotropic flow of dilute solutions of linear high-molecular-weight polymers. A program for a numerical solution of this equation is developed. Results are obtained for the time variation of turbulent pulsation energy, dissipation rate, efficiency of polymer additives, and other characteristics for different Reynolds numbers and different concentrations of the polymer additives. The results obtained indicate decreased dissipation of the turbulent flow and are in good qualitative agreement with existing experimental facts.Academic Scientific Complex A. V. Luikov Institute of Heat and Mass Transfer of the Academy of Sciences of Belarus, Minsk. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 67, Nos. 5–6, pp. 362–372, November–December, 1994.     

Local gas content and velocity of the liquid phase in ascending bubble flow

The results of an experimental investigation of the characteristics of ascending gas-liquid flow in a pipe for gas bubbles of different diameters are given.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 52, No. 2, pp. 181–186, February, 1987.     

An electrical arc in a turbulent gas flow

The self-similar solution of the equations describing an axisymmetric electrical arc in a turbulent gas flow is presented.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 48, No. 2, pp. 272–278, February, 1985.     

Adiabatic turbulent flow of a gas in a cylindrical tube

A solution is given for one-dimensional adiabatic turbulent flow of a compressible gas in a cylindrical tube, taking into account variation of the Re number along the tube and the influence of compressibility on the friction coefficient. The solution is compared with formulas derived in [1] and [2].     

Growth of a bubble of noncondensing gas injected into a liquid

The solution of the problem of growth of a gas-vapor bubble injected into a liquid is obtained. The growth of the bubble depends on mass transfer in the gas phase and heat transfer in the liquid phase. Experimental and theoretical data are compared.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 32, No. 6, pp. 978–989, June, 1977.     

Resistance to motion in turbulent flow of liquid film and of gas in vertical tubes

Expressions are obtained for the pressure losses and the friction coefficient of the film by solving separate equations of motion for each phase. Theoretical and experimental results are compared.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 30, No. 6, pp. 1035–1039, June, 1976.     

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.     

Modelling of a turbulent reacting gas/particle flow

Summary A mathematical model for two-phase turbulent reactive flows is presented which is based on considering both phases in Lagrangian manner. The mechanical and thermodynamical properties of the two-phase mixture are calculated along the trajectories of particles representing the system. Similar to Monte-Carlo methods for solving a high dimensional joint velocity-composition probability density function, the turbulent gas phase is described by means of stochastic calculus. The deterministic equations for individual solid particles can be treated directly. In this approach, the interaction between both phases is not smeared over computational cells but restricted to the vicinity of solid particles by the definition of an action-sphere which is attached to every solid particle. Applications of the method to isotropic, homogeneous turbulence indicate that it is capable of providing information on the local structure of combustion zones with species formation and transport. The results show that the method is applicable independent of the combustion modes in the gas phase, and it provides extensive statistics of various correlations of properties.     

An electric arc in a channel bearing a turbulent gas flow

A study of the positive column in an arc in a tube containing a turbulent gas flow is presented. Working formulas are given for estimating the arc parameters.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 35, No. 1, pp. 113–120, July, 1978.     

Calculation of electric arc interaction with a turbulent gas flow

The characteristics of an electric arc in a turbulent gas flow are studied. Relationships for calculating turbulent transport are presented.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 54, No. 4, pp. 550–557, April, 1988.     

Dynamic characteristics of pulsating turbulent flow of compressible gas in a channel

A model of turbulent transfer that allows for the effect of flow-rate oscillations on the turbulent stress is used to investigate pulsating turbulent flow of a compressible gas in a narrow channel. An algorithm for solving numerically the system of equations that describes this process by the finite-difference method with the use of an implicit iteration scheme is proposed. The effect of operating parameters on the amplitude-frequency characteristic is considered.     

Tangential stress in the descending flow of a turbulent film and a gas

The relationship between the pressure gradient and the tangential stress at the wall of the tube and at the interface is established. The tangential stress is found experimentally as a function of the Reynolds numbers of the two phases.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 28, No. 6, pp. 1050–1054, June, 1975.     

Electrode self-cleaning in a barrier ozonizer operating in a turbulent gas flow regime

The effect of self-cleaning of the discharge gaps in electric barrier ozonizers featuring a turbulent gas flow is related to the fact that the hydrodynamic forces (separating foreign solid and liquid particles from the electrode surface) predominate over electric forcers (attracting such particles to the electrodes). In this respect, ozonizers operating in a turbulent gas flow regime are advantageous over devices operating with a laminar flow.