Boris Boshenyatov

• Doctor of Technical Sciencies
• Researcher at Russian Academy of Sciences

Features of hot-shot wind tunnels and their characteristics are considered. The advantages of these facilities which significantly expand the range of operating parameters; as compared to the aerodynamic parameters of classical type wind tunnels were analyzed. It is shown that, for almost all aerodynamic experiments in the hot-shot wind tunnel, the...

The process of bubble coalescence is an important phenomenon, which has great influence on bubble sizes, gas volume fraction and gas-liquid mass transfer in many natural and technological processes. The physical laws that determine the bubble coalescence rate are not yet well understood. So, for example, most if not all mathematical models of coale...

A device for measuring the water level using a resistive sensor is described. The measurement accuracy is ±0.01 mm. The characteristics of the device and the example of its use for measuring waves on a water surface are presented.

Abstract—An analytical dependence between the dimensionless coefficients of added mass and thermal conductivity was obtained in a suspension of spherical particles. The dependence is confirmed by comparison with the theoretical data of other authors, including at elevated concentrations of dispersed particles, taking into account their hydrodynamic...

It is traditionally believed that theories and formulas for averaging (homogenization) the physical properties of dispersion media, which exclude the effect of the collective interaction of dispersed particles, are applicable only at low concentrations of the dispersed phase. This opinion was disapproved theoretically and then experimentally in a p...

It is traditionally believed that various theories and formulas for averaging (homogenization) the properties of inhomogeneous dispersive media, which do not take into account the distance interaction of dispersed particles, are applicable only at low volume concentrations of particles 0 < f < 0.1. The molecular heat transfer in two-phase dispersiv...

To protect the coastal areas of the seas and oceans from the destructive force of tsunami waves, coastal and surface barriers are usually built. However, for high waves, these barriers turn into underwater barriers through which tsunami waves pass practically without losing their energy. In this paper, we study a new principle of suppression of the...

The name of the second author should read S. I. Koshoridze instead of S. I. Kosharidze.

The paper presents the investigation results on the nonlinear effects due to the interaction of long gravitational tsunami-like waves with underwater barriers. Mathematical model is based on the two-dimensional Navier–Stokes equations for an incompressible fluid. The numerical results are obtained using the finite volume method and the open source...

The features of vortical suppression of tsunami waves by an impermeable underwater barrier have been studied. The height of the barrier is close to the optimum corresponding to the maximum effect of vortical suppression of the wave energy. It is shown that the energy of suppressing tsunami waves by such a barrier depends on the wave height and can...

The features of vortical suppression of tsunami waves by an impermeable underwater barrier have been studied. The height of the barrier is close to the optimum corresponding to the maximum effect of vortical suppression of the wave energy.

Conditions of stability of charged air nanobubbles in water are considered. Ranges of values of the charge and radius in which coalescence and division predominate are theoretically determined. The stability region is revealed in which the given processes are thermodynamically improbable. A comparison of the theory with the available experiment is...

The features of the surface structure of nanoporous and microporous polymer-membrane films promising for use in cleanrooms during the manufacturing of microelectronics products are examined. The degrees of asymmetry of selective and supporting surfaces are determined via scanning probe microscopy. The hydrodynamic characteristics of the membranes u...

Analytical dependences of the effective heat conductivity coefficient of an individual cluster and cluster nanofluid are obtained on the basis of classical equations of continuum mechanics with allowance for the interaction of temperature fields of spherical particles inside a cluster. The calculated dependences of the heat-conductivity coefficient...

This paper presents results of mathematical simulation of the interaction of long tsunami-like wave with a submerged obstacle in a wave flume. The calculations were performed using the OpenFOAM freeware package. The mathematical model included unsteady two-dimensional Navier-Stokes equations for an incompressible two-phase medium. The volume of flu...

The article presents the results of modeling the effect of vortex generators on the characteristics of a supersonic inlet device of an air-jet engine. The use of vortex generators to increase the autorun boundaries of supersonic input devices has not been considered in previously published papers. This paper presents a numerical method for identify...

A theoretical model explaining the effect of anomalous suppression of the energy (up to 70%) of tsunami-type waves by thin (compared to the wavelength) underwater obstacles is developed based on the integral laws of conservation of mass and energy fluxes. It is shown that the analytical dependences for the coefficients of reflection and transmissio...

It is known that Maxwell's equation (the Clausius-Mossotti formula) is widely used for calculating the electrical and thermal conductivity, dielectric constant, and other effective transport coefficients of disperse media. This formula does not take into account the interaction of particles with each other; therefore, it is believed to be valid onl...

This article examines the experimental and numerical simulation of the processes of distribution and interaction of tsunami-type gravitational waves with one barrier and a complex of two barriers. Experiments were conducted in a hydrodynamic channel using high-precision sensors for the measurement of the wave processes. Mathematical modelling was c...

An analytical dependence for computing the effective electrical and thermal conductivity of composite materials, taking into account interactions of spherical inclusions for an arbitrary ratio of conductivities of inclusions and a matrix, was obtained. Comparison with experimental results and numerical calculations of other authors is presented. It...

Heuristic Max-well formula is rigorously substantiated and also is applicable to dispersive media of increased concentrations. The results obtained are compared to the theoretical and experimental data of other authors, which relate to bubble media. The method of physical analogy is based on the fact that potential flows of a perfect fluid such as...

An analytical solution of the problem on the isothermal gas flow in a long tube with a permeable porous wall is derived. It is shown that this analytical solution can be used to calculate the optimal fiber length, including the nonporous permeable wall. The analysis of the application of the derived solution in studying the gas flow for various com...

The analytical dependence of transport coefficients (heat conductivity, electric conductivity, and static magnetic and electric permeability) in monodisperse suspension of spherical particles on their concentration is obtained taking into account the distant interaction between the particles providing an arbitrary ratio between the transport coeffi...

A model of the isothermal flow of a viscous ideal gas in long tubes (hollow fibres) with permeable walls is constructed. Analytical relations are derived for the relative flow rate of the gas through the permeable walls of tubes made of porous and non-porous materials. It is established that, for a specified pressure drop, there is an optimum lengt...

A study was conducted to propose the hypothesis that the observed effect of the destructive action of tsunami waves could be caused by the formation of large-scale vortex structures near the obstacle, which accumulated a significant fraction of the transmitted wave energy. The results of both experimental investigations and numerical calculations p...

Results of numerical simulation of generation and propagationof long gravitation waves, as well as their interaction with underwater obstacles in hydrodynamic channal are presented. As a mathematical model the two-dimentional Navier-Stoes equations in the incompressible liquid approximation are used. Results of the numerical simulation agree with e...

The data on measurements in the hydrodynamic flume of the amplitude coefficients of reflection and transmission of long gravitational waves of small amplitude during their interaction with impenetrable underwater obstacles of two types are given. In dimensionless coordinates, a comparison is made with the experiments of other authors and with the c...

The validity of the basic models of bubble coalescence including the new phenomenological model proposed in this paper was investigated, using the method of Direct Computer Simulation and representative experimental data. It is shown that the proposed phenomenological model of bubble coalescence gives the best description of the coalescence process...

The motion of a monodisperse medium is considered on the bases of self-consistent field method, taking into account the hydrodynamic interaction of spherical dispersed particles. The averaged analytical expressions for the relative velocity and virtual mass of particles are derived as a function of volume concentration and density ratio of the part...

On the basis of self-consistent field method, we consider the problem on the relative motion of phases and on the virtual mass of identical spherical particles in their joint motion in specified flow of an ideal fluid. A monodispersed medium with a specified bulk concentration of spherical particles occupies a semiinfinite space bounded by a plane...

A study was conducted to propose a method of computer simulation of evolution of the size distribution of the bubbles floating up in a stagnant fluid using a new model of coalescence. The model was based on the experimentally established dependence of the coalescence event of two colliding bubbles on the critical value of the Reynolds number. The m...

An experimental study concerning the influence of non-dimensional criteria (Reynolds number Re and Weber number We) on bubble coalescence is presented. Bubble collisions in three different liquids (with liquid dynamic viscosities: 10-3; 2.5·10-2 and 2.46·10-1 kg/m-1·s-1) were analyzed at temperature 20 0С, using air as the dispersed phase in all ca...

A study was conducted to investigate the role of hydrodynamic interaction in the process of bubble coalescence in liquid. The study was initiated due to the discovery of an unexpected feature of the microscopic-bubble gas-liquid medium. It was observed that bubble coalescence, including that in turbulent flows was absent in the medium. It was also...

The paper briefly revews the studies of hidrodynamic characteristics of micro bubble gas-liquid media with the increased (up to 2.5 %) concentration of micro buubles. It is shown that the properties of such medium are similar to those of one-phase liquids. However, when micro bubble gas-liquid media flows in smooth pipes, presence of micro bubbles...

The paper gives the charicteristics of gas-liquid bubble flow streams in smooth, horizontal pipes with microscopic diameters of bubbles (from 10 to 80 mcm) and volumetric gas contents from 0 to 0.5 %. It is shown that the Reynolds' law of similarity is true only for turbulent flow streams. Transition to the turbulent mode takes place at the minimal...

Experimental data on the effective viscosity of a microbubble gas-liquid (air in glycerol) medium are presented. It was demonstrated that the value of coefficient k in the theoretical Einstein equation mu = mu "SUB 0" (1 + k phi) for that viscosity is equal, to within the experimental error, to the same coefficient for a dilute suspension of solid...

Experiments described here indicate that the acoustic method is a quite accurate and reliable method of measuring the gas content of two-phase gas-liquid systems with microscopic bubbles (gas emulsions), for which other methods are not suitable. The applied acoustic signal should contain only frequencies considerably lower than the resonant frequen...