#### Volume 88, №5

**EFFECTS OF THE TYPES OF INLET GAS DISTRIBUTION ON THE FORMATION OF A FLUIDIZED-BED STRUCTURE OPTIMUM FOR COMBUSTION OF FUELS WITH A HIGH VOLATILE YIELD**

An experimental study has been made of the distributions of the coefficient of external heat exchange over the volume of the fluidized bed with different forms of inlet gas distribution. It has been shown that the grid giving a concave
inlet profi le of the air velocity ensures a required homogeneity of the bed′s structure at a high level of heat exchange.

**Author:**
V. A. Borodulya, Ya. S. Teplitskii, A. Zh. Greben′kov, D. S. Slizhuk, P. L. Is′emin, S. N. Kuz′min, and D. V. Klimov

**Keywords:**
gas distribution, heat-exchange coeffi cient, regular thermal regime, heat-exchange sensor

**Page:**
1045

**FEATURES OF THE DECOMPOSITION OF GAS HYDRATES WITH THE FORMATION OF ICE IN A POROUS MEDIUM**

We have investigated the features of the decomposition of gas hydrates into the gas and ice in the process of gas
extraction from a porous medium saturated with the gas and the gas hydrate in the initial state. We have obtained selfsimilar
solutions of this problem in an axisymmetric formulation describing the distributions of the main parameters
in the stratum upon decomposition of the gas hydrate in an extended region. Critical diagrams of existence of the
above solution have been constructed. It has been shown that in the case of a negative temperature of the stratum
in the initial state (T^{0} < 273.15 K), the gas hydrate will always decompose into the gas and ice. At a positive initial
temperature of the stratum (T^{0} > 273.15 K), the gas hydrate can decompose depending on the initial parameters of
the system and the intensity of extraction of the gas with the formation of both water and ice.

**Author:**
M. K. Khasanov, N. G. Musakaev, and I. K. Gimaltdinov

**Keywords:**
gas hydrate decomposition, self-similar solution, porous medium

**Page:**
1052

**MATHEMATICAL SIMULATION OF THE TRANSPORT OF SALT IN THE CASE OF FILTRATION AND MOISTURE TRANSFER IN SATURATED–UNSATURATED SOILS IN A MOISTENING REGIME**

Mathematical simulation of the process of the transport of salts by fi ltering a salt solution and by moisture transfer
at the action of horizontal systematic drainage in a moistening regime has been made. Based on the developed
computational algorithm, a numerical solution of the boundary-value problem of plane-vertical force-free stationary
fi ltration of a salt solution to horizontal systematic drainage in the presence of a free surface of ground water in
the region of a saturated–unsaturated soil has been obtained. The processes of fi ltration of a salt solution during
the action of drainage in the region of complete saturation and moisture transfer and in the region of incomplete
saturation are investigated with account for the transport of salts in corresponding subregions.

**Author:**
A. P. Vlasyuk and T. P. Tsvetkova

**Keywords:**
moistening regime, systematic drainage, fi ltration, salt transport, moisture transfer, complete and incomplete saturation, salt solutions

**Page:**
1062

**RELATION BETWEEN THE SUPERCOOLING AND CRYSTALLIZATION TEMPERATURES OF MOIST SOIL AND ITS STRENGTH IN THE FROZEN STATE**

The laws of phase transformations of water in disperse materials are discussed using soil as the example.
The dependence of the supercooling and crystallization temperatures of the soil moisture on the determining factors
has been considered. The relation between the supercooling and crystallization temperatures of the freezing soil and
the strength of the soil in the frozen state has been shown. A quantitative assessment of this strength has been made.

**Author:**
A. A. Konovalov

**Keywords:**
frozen soil, strength, supercooling, crystallization

**Page:**
1074

**INFLUENCE OF VIBROWAVE ACTION ON THE CHARACTER OF PRESSURE DISTRIBUTION IN A PERMEABILITY-INHOMOGENEOUS BED**

Based on theoretical investigations, the infl uence of different kinds of generator-produced elastic waves on
the character of change in the bottomhole pressure has been studied with account for the bed deformability.
An analytical expression has been obtained allowing one to determine the dynamics and depth of elastic wave
propagation in the bed with account for the bed collector deformation. It is shown that the degree of attenuation of
elastic waves in deformable collectors increases considerably as against undeformable ones.

**Author:**
É. M. Abbasov and N. A. Agaeva

**Keywords:**
filtration, pressure, bed, vibrowave action, differential equation, Bessel function, period, fluid

**Page:**
1082

**INVESTIGATION OF THE STATE OF WATER IN ENERGY TREES IN THE PROCESS OF DRYING BY DIFFERENTIAL SCANNING CALORIMETRY**

This paper presents the results of investigation of the state of water in young sprouts of energy trees (willow, poplar,
and alder) in the process of drying to the limiting moisture content by differential scanning calorimetry. The content
of freezing (free) and nonfreezing (bound) water in samples with various moisture contents has been determined. It
has been shown that the specifi c content of bound water (referred to dry substance) W_{b.w} in the above trees in the
process of their drying in the range from natural moisture to the limiting moisture content is not a constant quantity.
In these trees in the state of natural moisture the W_{b.w} value exceeds their hygroscopicity limit, and in the process of
dehydration the W_{b.w} value decreases. For instance, W_{b.w} varies from 0.419 to 0.254 g/g of dry substance for poplar,
from 0.425 to 0.248 g/g of dry substance for willow, and from 0.354 g/g of dry substance for alder.

**Author:**
V. A. Mykhailyk, Yu. F. Snezhkin, and N. V. Dmitrenko

**PHYSICAL PROCESSES AND TECHNICAL MEANS FOR USING THE THERMAL ENERGY OF ALTERNATIVE SOURCES**

The scheme of calculating the "pressure–concentration–temperature" diagrams with reference to a wide range of
hydride-forming materials in determining the thermodynamic characteristics of sorption-type hydrogen heat-pump
installations is presented.
The schematic diagram and operating principle of a three-adsorber refrigerator with a complex activated carbon
fi ber-alkali salts sorbent are described. This sorbent has a large cold holding capacity and a high rate of sorption.
Experimental data attest to the high efficiency of the apparatus.
The means of extraction of the low-temperature heat of soil and rocks for useful utilization are considered. The
effi ciency of the Clausius–Rankine cycle exploited in the operation of electric and thermoelectric power stations with
various organic working fl uids has been determined.

**Author:**
L. L. Vasiliev, V. V. Solovei, D. Kh. Kharlampidi, A. A. Stachel,c T. Kujawa, V. A. Tarasova, A. S. Zhuravlev,a A. P. Tsitovich, and E. V. Kostenko

**Keywords:**
heat pump, thermal transformer, hydrogen power engineering, renewable heat sources, geothermal energy, thermodynamic analysis, adsorption machines, absorption machines, sorption heat pipe, energy saving, Rankine organic cycle

**Page:**
1100

**DETERMINATION OF THE HEAT-TRANSFER CHARACTERISTICS OF THE VIBROROTATING BED OF A FINE MATERIA AS APPLIED TO THE QUENCHING PROCESSES OF STEEL PARTS**

The quenching properties of MZM-26 industrial quenching oil have been compared with those of the vibrorotating
bed of a fi ne material as applied to ShKh15 steel. The effi ciently of using a vibrorotating bed as a quenching medium
for small steel parts has been substantiated by experiments.

**Author:**
G. I. Zhuravskii, O. G. Martinov, A. A. Shipko, and T. N. Shtolik

**Keywords:**
heat transfer, vibrorotating bed, fine material, quenching, steel part

**Page:**
1110

**ANALYSIS OF THE REGION OF VALIDITY OF EQUATIONS FOR CALCULATING HEAT EXCHANGERS OF THE TUBE-IN-TUBE TYPE**

Based on the traditional model with direct fl ow and counterfl ow of heat transfer agents in a stationary regime,
the operation of a heat exchanger of the tube-in-tube type is analyzed. Account is taken of the natural limitations
for the model that are connected with the possibility of practical realization of the similarity numbers involved in
the equations of the model, as well as with the conditions (assumptions) invoked in the derivation of the model.
A comparison of the effi ciency of heat transfer in the noted regimes of heat transfer agent motions is made. For
the purposes of this comparison, it is proposed to use an averaged value of the function that represents the ratio
of effi ciencies with heat transfer agent direct fl ow and counterfl ow over the region of possible values of similarity
numbers. The necessary calculations and illustrations are presented.

**Author:**
A. I. Moshinskii

**Keywords:**
heat transfer, heat exchanger, heat transfer agent, direct flow, counterflow

**Page:**
1119

**MULTILAYER, IMPLICIT, PARALLEL ALGORITHM FOR THE EQUATION OF HEAT CONDUCTION IN A PARALLELEPIPED**

With the use of the method of computational experiment, a problem of heat distribution in a parallelepiped is
investigated. It is shown that a three-dimensional problem can be solved on a PC

**Author:**
S. D. Algazin

**Keywords:**
heat condition equation, computational experiment

**Page:**
1131

**NONSTATIONARY AXISYMMETRIC TEMPERATURE FIELD IN A TWO-LAYER SLAB UNDER MIXED HEATING CONDITIONS**

With the use of the Laguerre and Hankel integral transforms, the solution of a two-dimensional initial-boundary-value
heat conduction problem for a two-layer slab under mixed boundary conditions is constructed: one of the surfaces is
heated by a heat fl ux distributed axisymmetrically in a circle of radius R and is cooled by the Newton law outside this
circle. The solution of the problem is reduced to a sequence of infi nite quasi-regular systems of algebraic equations. The
results of numerical analysis of the temperature fi eld in the two-layer slab made from an aluminum alloy and ceramics
are presented depending on the relative geometric properties of the components and cooling intensity.

**Author:**
I. N. Turchin, I. Timar, and Yu. A. Kolodii

**Keywords:**
nonstationary heat conduction, mixed boundary conditions, inhomogeneous body, Laguerre polynomials, paired integral equations

**Page:**
1135

**EVAPORATION OF WATER IN THE PROCESS OF MOVEMENT OF ITS LARGE MASSES THROUGH A HIGH-TEMPERATURE GAS MEDIUM**

A numerical investigation of the heat transfer in large monolithic water masses and water masses with different
spaces fi lled with water vapor and gases, moving through high-temperature gases at temperatures higher than
1000 K under the conditions of phase transformations, has been performed. The completeness of evaporation of the
water from a water mass moving in a high-temperature gas medium was numerically estimated with account for the
degree of inhomogeneity of the water mass.

**Author:**
A. O. Zhdanova, G. V. Kuznetsov, and P. A. Strizhak

**Keywords:**
heat of vapor formation, heat transfer, evaporation of water, water mass, fl ame zone, combustion, high-temperature gases

**Page:**
1145

**PHYSICAL PRINCIPLES OF OPERATION OF A TWO-STAGE LIGHT GAS MAGNETOPLASMA LAUNCHER FOR HIGH-VACUUM BALLISTIC TESTS**

The results of experimental and theoretical investigations of the operation and a two-stage light gas magnetoplasma
launcher are presented. An optical method for measuring the velocity of small bodies (2–10 mm) has been developed
and used in testing a combined gas discharger for micro- and macroparticle acceleration. The experimental results
are in good agreement with the mathematical model of the two-stage light gas gun in the approximation of constancy
of the accelerating pressure behind the striker

**Author:**
P. P. Khramtsov, O. G. Penyazkov, V. A. Vasetskii, V. M. Grishchenko, A. I. Makhnach, and I. A. Shikh

**Keywords:**
plasma, erosion plasma, accelerator, laser ballistic chronometer

**Page:**
1154

**TEMPERATURE CORRECTION IN PROBE MEASUREMENTS**

This work is devoted to experimental investigations of a decaying plasma using Langmuir probes. The gas pressure,
the discharge current, and the moment of afterglow were selected to obtain probe characteristics in collisionless,
intermediate, and drifting regimes of motion of charged particles. The manner in which the shape of the volt–ampere
characteristics changes on passage from the collisionless motion to diffusion motion has been shown. A detailed
analysis has been made of the source of errors arising when orbital-motion formulas or the logarithmic-operation
method are applied to processing of the probe curves. It has been shown that neglect of collisions of charged
particles in the probe layer leads to an ion-density value overstated more than three times, an electron-temperature
value overstated two times, and an ion temperature overstated three to nine times. A model of interaction of charged
particles in the probe layer has been proposed for correction of the procedure of determining temperature. Such an
approach makes it possible to determine the space-charge layer in the probe, and also the value of the self-consistent
fi eld. The use of the developed procedures gives good agreement between experimental and theoretical results

**Author:**
S. A. Gutsev

**Keywords:**
low-pressure plasma, afterglow plasma, Langmuir probes, orbital motion, volt–ampere characteristic, particle energy distribution function, electron temperature, space-charge layer

**Page:**
1163

**SEPARATION OF AN ASSIGNED POLARIZATION COMPONENT OF ELECTROMAGNETIC RADIATION IN ITS REFLECTION FROM AN ANTIREFLECTION ABSORBING SUBSTRATE**

We have found conditions ensuring separation of one of the two polarization components of electromagnetic radiation
incident at an angle on a plane antirefl ection absorbing substrate

**Author:**
S. R. Kasimova and É. R. Kasimov

**Keywords:**
electromagnetic waves, polarization components, absorbing substrate

**Page:**
1175

**GENERALIZATION OF EXPERIMENTAL DATA ON HEAT TRANSFER AND HYDRAULIC RESISTANCE OF CHANNELS WITH SPHERICAL PROTRUSIONS**

Experimental investigations of hydraulic resistance and heat transfer in channels with intensifi ers in the form
of systems of spherical protrusions have been generalized in a wide range of working and design parameters. A
unifi ed approach to the correlation of experimental data of various investigators with account for the differences in
the geometry of heat transfer surfaces has been worked out. Unifi ed universal dependences for the coeffi cients of
hydraulic resistance and heat transfer in channels with spherical protrusions are obtained.

**Author:**
I. A. Popov, A. V. Shchelchkov, and M. Z. Yarkaev

**Keywords:**
intensifi cation, spherical protrusions, hydraulic resistance, heat transfer coeffi cient

**Page:**
1183

**NUMERICAL INVESTIGATION OF THE VENTILATION PROCESSES IN A CLOSED SPACE IN THE PRESENCE OF PEOPLE AND HEAT SOURCES**

The fl ow of a viscous gas in a model section of a closed ventilated space, in which people and objects radiating heat
are found, was investigated with the use of numerical-simulation methods. A numerical algorithm developed on the
basis of the program package VP2/3 was used for simulation of a nonisothermal turbulent fl ow of a viscous gas in
the indicated space. In the process of simulation of this nonstationary gas fl ow, the Reynolds equations closed with
the use of the differential k–ω model of turbulence in the SST modifi cation of Menter were solved. The effi ciency of
the mathematical model and the numerical algorithm used in the calculations was verifi ed by comparison of their
results with experimental data.

**Author:**
S. A. Isaev, P. A. Baranov, A. E. Usachov, and D. A. Malyshkin

**Keywords:**
ventilation, closed space, turbulence, MSST model, VP2/3 package

**Page:**
1191

**ON THE DYNAMIC STABILITY OF A CONE IN A SUPERSONIC FLOW WITH A STRONG COUNTER GAS BLOW FROM THE SURFACE OF ITS BLUNT PART**

The infl uence of a strong gas blow from the surface of the spherical blunt part of a cone to meet the incident
supersonic fl ow on the stability of the directed movement of the cone was investigated.

**Author:**
F. M. Pakhomov

**Keywords:**
supersonic flow, angle of attack, counter blow of gas, nose, dynamic stability

**Page:**
1198

**USE OF WENO SCHEMES FOR SIMULATION OF THE REFLECTED SHOCK WAVE–BOUNDARY LAYER INTERACTION**

Numerical simulation of the shock wave–laminar boundary layer interaction is carried out on the basis of the model
problem at different Reynolds numbers. The use of WENO schemes of high order of accuracy is demonstrated.
The calculated shock-wave structure of the fl ow is compared with the data available in the literature and with the
data obtained from TVD schemes. Criteria of accuracy of numerical calculations that are related to the position of
shock-wave structures, and also the time of solution of the problem with various difference schemes, are discussed.
Recommendations on practical use of difference schemes of high order of accuracy are given.

**Author:**
P. V. Bulat and K. N. Volkova,

**Keywords:**
shock wave, boundary layer, numerical simulation, WENO schemes

**Page:**
1203

**SUPERSONIC FLOWS IN CHANNELS AND JETS WHEN APPLIED TO THE PROBLEMS OF DESIGNING AERODYNAMIC WINDOWS OF GAS LASERS**

Consideration is given to issues associated with the development of aids for mathematical modeling of steadystate
supersonic perfect compressible gas flows in aerodynamic windows of gas lasers. A comparison is made of
fl ow patterns in supersonic jets, which appear when a uniform velocity distribution and a velocity distribution
corresponding to the free vortex are realized on the nozzle section. Aids for designing channels are developed on the
basis of solution of a sequence of primal problems. The calculation results show the high effi ciency of the developed
software as applied to solution of problems associated with the contouring of channels and nozzles and with the
control over supersonic jet fl ows.

**Author:**
K. N. Volkov, V. N. Emel′yanov, and A. V. Pustovalov

**Keywords:**
aerodynamic window, supersonic flow, nozzle, jet, marching method.

**Page:**
1210

**ON TRANSFORMATIONS OF THE VELOCITY HODOGRAPH IN CERTAIN PROBLEMS OF FLUID MECHANICS**

Consideration is given to the fl ow-velocity hodograph representing a circular hexagon in polar grids with two
cuts, which is used in the theory of jets and cavitation, gliding theory, gas dynamics, the theory of groundwater
motion, and fi ltration theory. It has been shown that in recording the parameter characterizing the ratio of the
radii of circles, which are the opposite polygon sides with cuts, the confi guration and relative position of the latter
substantially change not so much with the properties of the functions on whose basis particular solutions of the
corresponding Fuchsian-type equation are constructed, as with the ranges of conformal-mapping constants involved
in the expressions for mapping functions. It has been established that to different ranges of variation in these
constants there can correspond cuts varying in confi guration and relative position. This is a manifestation of the
transformation of liquid and gas fi ltration fl ows under the infl uence of different physical factors.

**Author:**
É. N. Bereslavskii

**Keywords:**
Fuchsian differential equations, conformal mapping, region of the velocity hodograph, circular and rectilinear cuts, elliptic Jacobian functions, theta functions

**Page:**
1221

**INFLUENCE OF THE EXTERNAL FORCE ON THE VORTEX–SOURCE COMBINATION CRISIS**

This paper considers the force stagnation of a supersonic vortex–source combination fl owing out into a vacuum,
leading to a decrease in the radial Mach number to unity and stationary fl ow choking. The similarity parameters
infl uencing the crisis are analyzed. It has been shown that the ″force″ crisis (choking) is also possible for the vortexsink
combination fl owing out of a submerged space. The formulation of the thermal crisis problem is generalized
to the case of a given external force per unit mass and in a unit volume. Comparison has been made between
certain characteristics of the crisis due to the applied external force in the absence of power supply/removal and the
characteristics of the crisis due to the heat input in the absence of external force. The investigation has been carried
out from the viewpoint of the perfect gas model.

**Author:**
A. N. Kucherov

**Keywords:**
vortex–source combination, vortex-sink combination, radial external force, fl ow rate, circulation, radial Mach number, flow choking, crisis.

**Page:**
1228

**NUMERICAL INVESTIGATION OF THE DURATION OF THE EFFECT EXERTED BY INITIAL REGIMES ON THE PROCESS OF LIQUID MOTION IN A PIPELINE**

By using numerical methods, the duration of the effect exerted by initial regimes on the running state of a nonstationary
process of liquid motion in a linear part of a pipeline has been investigated depending on the values of various
parameters of this process. The process is described by a system of two hyperbolic-type partial differential equations.

**Author:**
E. R. Ashrafova

**Keywords:**
hyperbolic equation, dissipation factor, pipeline

**Page:**
1239

**ABOUT THE DIVERGENT FORM OF EQUATIONS FOR A ONE-VELOCITY MULTICOMPONENT MIXTURE**

The divergent form of the equations of a generalized equilibrium model of a multicomponent mixture, in which the
interfraction-interaction forces are taken into account, is discussed. The modifi ed Godunov method developed for
integration of model equations is described. A number of one-dimensional and two-dimensional problems were
calculated with the use of this method.

**Author:**
V. S. Surov and I. V. Berezanskii

**Keywords:**
one-velocity multicomponent mixture, hyperbolic system of equations, divergent form, Godunov method, linearized Riemann solver

**Page:**
1248

**FREE CONVECTION FLOW PAST A VERTICAL CONE WITH A CHEMICAL REACTION IN THE PRESENCE OF TRANSVERSE MAGNETIC FIELD**

Natural convective heat and mass transfer over an isothermal vertical cone due to the simultaneous action of
buoyancy, chemical reaction, and transverse magnetic fi eld is studied. The governing boundary-layer equations
are transformed into a dimensionless form, and then the resulting unsteady nonlinear coupled partial differential
equations are solved by using an effi cient, more accurate, and unconditionally stable implicit fi nite difference
scheme of the Crank–Nicolson type. A parametric study is performed to illustrate the effect of the buoyancy ratio
parameter, Prandtl number, Schmidt number, chemical reaction parameter, and the magnetic fi eld parameter on the
velocity, temperature, and concentration profi les. The local and average characteristics: shear stresses, heat transfer
coeffi cients, and mass transfer coeffi cients, are obtained numerically. The numerical results reveal that the velocity
decreases in the case of a destructive reaction, whereas it increases for a generative reaction.

**Author:**
G. Palani and A. R. Ragavan

**Keywords:**
one, chemical reaction, magnetohydrodynamics, implicit fi nite difference, Nusselt number

**Page:**
1256

**THERMOELASTIC WAVES WITH THERMAL DIFFUSION IN AN ISOTROPIC MICROPOLAR PLATE**

The generalized theory of thermodiffusion is applied to study the propagation of plane harmonic waves in an infi nitely
long isotropic micropolar plate. The present analysis also includes both the thermal and mass diffusive relaxation
times, as well as the coupling of the thermal diffusion with microrotation of the material. To determine the effect
of the presence of thermal as well as mass diffusion on the phase velocity of the wave propagation, two potential
functions are used, and more general dispersive relations are obtained for symmetric and antisymmetric modes. The
results for the cases of thermoelasticity, micropolar thermoelasticity, and thermodiffusive elasticity are derived. The
changes in the phase velocity, attenuation coeffi cient, and the specifi c loss factor with the wave number are shown
graphically

**Author:**
S. Shaw and B. Mukhopadhyay

**Keywords:**
thermodiffusion, mass concentration, micropolar plate, relaxation time, phase velocity

**Page:**
1264

**NUMERICAL INVESTIGATION OF FLOW IN A CENTRIFUGAL COMPRESSOR**

With the use of the domestic software suite of computational hydrodynamics FlowVision based on application of
the method of control volumes, numerical simulation of air composition and delivery by a centrifugal compressor
employed for supercharging a piston engine has been carried out. The head-fl ow characteristics of the compressor,
as well as the 3D fi elds of fl ow velocity and pressure distributions in the elements of the compressor fl ow passage,
including the interblade channels of the impeller, have been obtained for various regimes. In the regimes of diminished
air fl ow rate, surging phenomena are identifi ed, characterized by a return fl ow. The application of the technique of
numerical experiment will make it possible from here on to carry out design optimization of the compressor fl ow
passage profi le and thus to improve its basic characteristics — the degree of pressure increase, compressed air fl ow
rate, and the effi ciency — as well as to reduce the costs of the development and production of compressors.

**Author:**
Yu. A. Grishin and V. N. Bakulin

**Keywords:**
computational hydrodynamics, method of control volumes, FlowVision suite, centrifugal compressor, head-fl ow branches, velocity and pressure fields

**Page:**
1274

**NUMERICAL ALGORITHM FOR INVESTIGATING LARGE ELASTO-PLASTIC DEFORMATIONS**

A method of investigating the stressed-strained state of elasto-plastic bodies subjected to large deformations is
presented.

**Author:**
R. L. Davydov and L. U. Sultanov

**Keywords:**
large deformations, nonlinear elasticity, plasticity

**Page:**
1280

**INVESTIGATIONS INTO THE INTERCASSETTE COOLANT INTERACTION IN THE WWER-1000 REACTOR CORE WITH DIFFERENT MODIFICATIONS OF FUEL ASSEMBLIES**

The authors give the results of experiments investigations into the intercassette interaction of the coolant in the
WWER-reactor mixed core consisting of TVSA–T and TVSA–12 PLUS. The investigations were carried out on an
aerodynamic stand by the method of gas tracer diffusion. An analysis of the spatial distribution of projections of the
absolute fl ow velocity and of the propagation of the tracer concentrations enabled the authors to particularize the
pattern of coolant fl ow past the spacer and mixing grids of the fuel assemblies.

**Author:**
S. M. Dmitriev, A. V. Varentsov, A. A. Dobrov, D. V. Doronkov, A. N. Pronin, V. D. Sorokin, and A. E. Khrobostov

**Keywords:**
core, fuel assembly, spacer and mixing grids, intercassette interaction, hydrodynamics of the coolant

**Page:**
1289

**MODELING OF COOLANT FLOW IN THE FUEL ASSEMBLY OF THE REACTOR OF A FLOATING NUCLEAR POWER PLANT USING THE LOGOS CFD PROGRAM**

Results of computer modeling of coolant fl ow in the fuel assembly of the reactor of a fl oating nuclear power plant
using the LOGOS CFD programs have been given. The possibility of using the obtained results to improve models
built into the engineering programs of thermohydraulic calculation of nuclear-reactor cores has been considered.

**Author:**
S. M. Dmitriev, A. A. Dobrov, M. A. Legchanov, and A. E. Khrobostov

**Keywords:**
core, reactor facility, fuel assembly, heat and mass transfer, computational hydrodynamics.

**Page:**
1297

**RECONSTRUCTION OF THE VORTEX-JET STRUCTURE OF THE SEPARATION TURBULENT FLOW IN A SPHERICAL DIMPLE ON THE WALL OF A NARROW CHANNEL WITH INCREASE IN THE DEPTH OF THE DIMPLE AND INTENSIFICATION OF THE SECONDARY FLOW IN IT**

On the basis of an analysis of the reconstruction of the vortex-jet structure of the completely developed turbulent fl ow
of an incompressible fl uid in a spherical dimple on the wall of a narrow plane-parallel channel with increase in the
depth of the dimple, a map of regimes of separation fl ow around such a dimple at a Reynolds number of 40,000 has
been developed with special emphasis on the intensifi cation of the multivortex fl ow formed in the indicated dimple in
the case where a symmetric fl ow in it is changed to the axisymmetric one.

**Author:**
S. A. Isaev, A. I. Leont′ev, A. V. Shchelchkov, and M. E. Gul′tsova

**Keywords:**
spherical dimple, narrow plane-parallel channel, swirling flow, turbulence.

**Page:**
1304