HEAT AND MASS TRANSFER IN POROUS AND DISPERSED SYSTEMS

PHYSICOCHEMICAL BASES OF AUTONOMOUS MAINTENANCE

OF HUMIDITY AND TEMPERATURE IN CLOSED SPACES

Yu. I. Aristov,^{b} L. L. Vasiliev,^{a} I. S. Glaznev,^{b}

L. G. Gordeeva,^{b} A. S. Zhuravlev,^{a,} M. N. Kovaleva^{a}

UDC 536.24+621.1

An inexpensive adsorption humidistat working in the static and dynamic regimes is proposed. This humidistat

is designed for maintenance of the relative humidity and temperature in a closed space at levels (15–

18%, 20–25oC) necessary for reliable storage of rare books, manuscripts, pictures, and museum valuables

and for their safe transportation in the process of visiting exhibitions. Principles of maintenance of the relative

humidity in a closed space with the use of chemical substances and autonomous thermostatting of this

space are considered. Results of testing of some new moisture buffers under laboratory and real conditions

are presented.

Keywords: storage of rare books, manuscripts, pictures, and exhibits, humiddistat, microclimate, thermo- and

hydrostatting.

PAGE 977

THERMAL MANAGEMENT OF THE ADSORPTION-BASED

VESSEL FOR HYDROGENEOUS GAS STORAGE

L. L. Vasiliev, L. E. Kanonchik, and V. A. Babenko

UDC 621.577

Thermal management is a design bottleneck in the creation of rational gas storage sorption systems. Inefficient

heat transfer in a sorption bed is connected with a relatively low thermal conductivity (0.1–0.5 W/(m⋅K))

and an appreciable sorption heat of activated gas storage materials. This work is devoted to the development

of a thermally regulated onboard system of hydrogenous gas (methane and hydrogen) storage with the use of

novel carbon sorbents. A hydrogenous gas storage system based on combined gas adsorption and compression

at moderate pressures (3–6 MPa) and low temperatures (from the temperature of liquid nitrogen of about 77

K to a temperature of 273 K) is suggested.

Keywords: hydrogenous gas, storage vessel, heat pipe, sorbent, carbon fiber, metal hydride, numerical modeling.

PAGE 987

FLUID FILTRATION IN A POROUS MEDIUM

WITH WELLS WITH VERTICAL HYDRAULIC

FRACTURE OF THE FORMATION

A. Ya. Davletbaev

UDC 532.546

Consideration is given to the problem on propagation of a pressure field in a low-permeability porous medium

with two wells that are connected by a technogenic hydraulic fracture. The approximate numerical solution

of this problem is obtained; an analysis of the influence of the above fracture on the system’s

parameters is made; responses of the pressure in a well are modeled. The inverse problem is solved with the

numerical model developed, and the system’s parameters are evaluated from the field data measured in the

process of hydrodynamic investigation by the method of pressure interference testing.

Keywords: technogenic hydraulic fracture, well, filtration, porous medium, low-permeability reservoir, pressure

interference testing.s

PAGE 997

NUMERICAL METHOD OF SOLVING THE INVERSE

PROBLEM OF WATER–OIL PLUG DISPLACEMENT

FROM AN OIL POOL

Kh. M. Gamzaev

UDC 532.546:519.63

The inverse problem on the recovery of a boundary regime in the process of water–oil plug displacement

from an oil pool by the given law of motion of the boundary between the liquids is considered. Applying the

methods of rectification of fronts and difference approximation, the problem posed is reduced to two difference

problems. A computational algorithm for solving the resulting problems is suggested.

Keywords: oil pool, plug displacement, inverse boundary problem, method of rectification of fronts, difference

method.

PAGE 1004

ON THE LONGEVITY AND STRENGTH

OF ICE-CONTAINING MATERIALS

A. A. Konovalov

UDC 624.139

It has been shown that there exist two failure mechanisms (brittle and ductile) of the frozen ground connected

with the phase transition of the ground moisture. For both failure mechanisms, formulas for the longevity and

long-term strength of the ground, including that with variable load and temperature, have been obtained. For

the first time the quantitative expression for the pressure and temperature conditions determining the prevalence

of one of these mechanisms has been obtained.

Keywords: longevity, strength, frozen ground, ice, failure, strain.

PAGE 1011

COMPLEX HEAT EXCHANGE IN THE PROCESS

OF FILTRATION IN A GRANULAR BED

Yu. S. Teplitskii,^{a} E. A. Pitsukha,^{b} and D. G. Belonovicha

UDC 532.529

Simple generalized equations for calculating the temperature field in a high-temperature ring granular bed,

the critical height of this bed, and its resistance have been obtained on the basis of a heat-exchange model

accounting for the radiative heat transfer.

Keywords: ring granular bed, heat-exchange model, radiative heat transfer, air heater, low-power, boiler.

PAGE 1018

INVESTIGATION OF FLOWS IN A VORTEX-BED CHAMBER

E. A. Pitsukha,^{a} Yu. S. Teplitskii,^{b} and V. A. Borodulya^{b}

UDC 532.529

Swirling flows in a vortex chamber of diameter 0.393 m with a granular bed on a gas-distribution grate and

a bottom blow were experimentally investigated. The structure of a swirling flow and the influence of a

granular bed on this flow were determined. Equations for calculating the main characteristics of a swirling

air flow in the indicated chamber with an immovable granular bed and a bottom blow have been derived.

Keywords: vortex-bed chamber, bottom blow, granular bed, gas-distribution grate, tangential velocity, longitudinal

velocity, drag of the chamber.

PAGE 1025

MODELING AND EXPERIMENTAL INVESTIGATION

OF THE HEAT AND MOISTURE TRANSFER

IN THE PROCESS OF MICROWAVE-CONVECTIVE

DRYING OF VEGETABLE MATERIALS

P. V. Akulich,^{a} A. V. Temruk,^{b}

and A. V. Akulich^{c}

UDC 66.047:536.24

This paper discusses the results of mathematical modeling of the interrelated processes of heat and moisture

transfer in vegetable materials in the process of their convective drying with the use of microwave radiation

and of experimental investigations of the influence of the operating parameters of the process on the drying

dynamics and kinetics.

Keywords: heat and moisture transfer, drying, drying kinetics and dynamics, vegetable materials.

PAGE 1034

INFLUENCE OF CATALYTICITY OF A POROUS

MEDIUM ON THE CONCENTRATION LIMIT

OF FILTRATION COMBUSTION OF A WATER-ORGANIC

MIXTURE IN A REVERSIBLE FLOW REACTOR

K. V. Dobrego and I. A. Koznacheev

UDC 536.46

The problem on oxidation purification of water in a reversible flow reactor with the use of a catalyst has

been studied by numerical methods. We have made comparative studies of the concentration limits of mixture

combustion attained in inert and catalytic porous media reactors at varied values of the liquid flow rate, the

reactor length, the heat loss coefficient, and the size of the packed bed. It has been established that the use

of a catalyst leads to an insignificant decrease in the concentration limit: 11.6% against 13.4% (adiabatic

case) and 12.5% against 13.9% (standard insulation).

Keywords: water purification, filtration combustion, modeling.

PAGE 1043

HEAT AND MASS TRANSFER IN COMBUSTION PROCESSES

FORMATION OF DETONATION IN A PULSE

COMBUSTION CHAMBER WITH A POROUS

OBSTACLE

Kh. Alhussan,^{a} M. S. Assad,^{b}

O. G. Penyazkov,^{b} and K. L. Sevruk^{b}

UDC 533.6:533.9:536.46

A study has been made of the influence of a porous obstacle on deflagration-to-detonation transition in a

pulse combustion chamber of small length. Dependences of the detonation-wave velocity on the distance have

been obtained for two samples of a porous material (steel spheres and a ceramic porous body). It has been

shown that the use of an insert from a porous material leads to a reduction of 40% in the predetonation distance

without changing substantially the structure of the pulse combustion chamber.

Keywords: deflagration-to-detonation transition, porous obstacle, detonation velocity, thrust.

PAGE 1052

THERMODYNAMIC SUBSTANTIATION OF THE EXISTENCE

OF A PHASE TRANSITION POINT WITH A CHANGE

IN THE STRUCTURE OF THE SOLID-FUEL MIXTURE

GLYCIDYL AZIDE POLYMER/RDX

S. I. Futko

UDC 662.612.2, 662.311.1

With the help of thermodynamic calculations for a wide range of solid-fuel mixtures glycidyl azide polymer

(GAP)/RDX with a component ratio from 100% GAP/0% RDX to 0% GAP/100% RDX we have found a

structural transition point corresponding to a mixture of 60.8 mass % of RDX in GAP at which a sharp

change in the trend of thermodynamic combustion characteristics of these mixtures occurs. The given point is

determined from the condition of equality of molar fractions of C and O atoms in the above mixtures. It is

pressure-independent, corresponds to the minimum point on the curve of the rate of combustion of the mixture

as a function of its composition and to the structural change in the solid-fuel mixture GAP/RDX from amorphous

to polycrystalline, and is a phase transition point.

Keywords: solid mixed fuel, solid fuel combustion, mathematical modeling, solid-fuel rocket engines, technologies

of microelectromechanical systems, microthruster, glycidyl azide polymer, nitramines, RDX, rate of combustion,

amorphous structure, polycrystalline structure.

PAGE 1058

MATHEMATICAL SIMULATION OF THE COMBUSTION

OF A PEAT BED. INFLUENCE OF STEAM CONDENSATION

N. N. Gnezdilov, I. M. Kozlov, and K. V. Dobrego

UDC 536.46

A model of the pyrolysis and combustion of a porous medium in the absence of forced convection is suggested.

Substantial differences between this statement of the problem and filtration combustion of gases in

inert porous media are considered. The influence of the condensation of steam contained in the products of

pyrolysis on gas filtration and the temperature field close by the combustion site is shown.

Keywords: filtration, combustion, heterophase medium, peat.

PAGE 1066

DISTINCTIVE FEATURES OF BURNING OF A SOLID BIOFUEL

IN A CYCLONE-BED FURNACE

E. A. Pitsukha,^{a} Yu. S. Teplitskii,^{b} and V. A. Borodulya^{b}

UDC 536.2:532/533

A study has been made of the distinctive features of burning of a solid biofuel (wood, peat) in a cyclone-bed

furnace. The limiting values of the moisture of wood chips as received and of the mass content of milled peat

in the chip–milled peat mixture, at which the regime of its combustion is unstable, have been found. The temperature,

velocity, and pressure distribution in the indicated furnace have been established. The dependences

of the concentration of carbon and nitrogen monoxides on the excess air in exhaust gases in burning lump

wood and crushed peat briquettes have been established.

Keywords: cyclone-bed furnace, air-heater boiler, combustion chamber, afterburner section, bottom blowing,

tangential blowing, excess air, carbon monoxide, nitrogen monoxide, temperature in the furnace, moisture of the

fuel as received.

PAGE 1076

NANOSTRUCTURES

IMPROVEMENT OF THE SERVICE PROPERTIES

OF ELASTOMER COMPOSITIONS BY INTRODUCTION

OF CARBON NANOMATERIALS

K. V. Vishnevskii,^{a} Zh. S. Shashok,^{a} N. R. Prokopchuk,^{a}

A. V. Krauklis,^{b} and S. A. Zhdanok^{b}

UDC 678.4.04

The influence of a carbon nanomaterial obtained in a high-voltage discharge plasma on the endurance of

elastomer compositions has been investigated for the first time. The results of these investigations agree with

those obtained in determining the parameters of the vulcanization kinetics, conventional tensile strength, relative

breaking elongation, and resistance to thermal aging and swelling in liquid hydrocarbon media of highly

filled rubbers based on butadiene-nitrile caoutchoucs. To verify the assumed mechanism underlying the action

of a carbon nanomaterial on elastomer compositions, the parameters of their vulcanizing network have been

determined using the method of equilibrium swelling. It is shown that the introduction of a carbon nanomaterial

into polar caoutchouc-based rubber allows one to substantially improve its service characteristics and

endurance.

Keywords: endurance, activation energy of thermal-oxidation dehydration, service characteristics, butadiene-nitrile

caoutchouc, rubber, carbon nanomaterials, nanotubes, nanofibers.

PAGE 1086

SIZE EFFECTS DURING PHASE

TRANSFORMATIONS IN NANOOBJECTS

V. Levdanskii,^{a} J. Smolik,^{b} and V. Zdimal^{b}

UDC 541.182

The joint influence of size effects connected with physicochemical processes both on the surface of nanoobjects

and in their volume on the phase transformations taking place in them has been investigated theoretically.

The joint manifestation of the surface and volume size effects has been analyzed using as an example

the growth of silicon nanowhiskers.

Keywords: size effects, nanoobjects, phase transitions, nanowhiskers.

PAGE 1092

NANOSTRUCTURES OF AIVBVI COMPOUNDS

FOR THERMOELECTRIC CONVERSIONS

D. M. Freik, L. I. Mezhylovskaya, I. K. Yurchishin,

Yu. V. Lysyuk, and A. I. Tkachuk

UDC 53.072.001.57; 537.222.2

On the basis of the theoretical model of a quantum well with infinitely high walls the dependences of the

thermoelectric parameters of nanostructures of lead chalcogenides PbTe, PbSe, and PbS on their thickness

have been investigated. It has been found that the Seebeck coefficient of such structures changes nonmonotonically

with the width of the corresponding quantum well. Comparison has been made between the theoretical

and experimental dependences of the Seebeck coefficient of the above nanostructures on their thickness for

the oscillation period of these dependences, and the Fermi energy for such structures has been determined. It

has been shown that the minimum width of the quantum well at which the first energy level of the considered

nanostructures coincides with the Fermi level is equal to the oscillation period of their Seebeck coefficient.

Keywords: nanostructure, quantum-dimensional effects, lead chalcogenides.

PAGE 1097

HEAT CONDUCTION AND HEAT TRANSFER IN TECHNOLOGICAL PROCESSES

NEW MODEL REPRESENTATIONS OF DYNAMIC

THERMOVISCOELASTICITY IN THE PROBLEM

OF HEAT SHOCK

E . M. Kartashov

UDC 593.3

A theory of dynamic thermoviscoelasticity in the problem on heat shock has been developed. New integral relations

for dynamic thermoviscoelasticity have been obtained on the basis of the determining dynamic-thermoelasticity

equations and the Maxwell and Kelvin linear rheological models. The expressions obtained can

be used in different scientific and technological practical applications.

Keywords: heat shock, dynamic thermoviscoelasticity of a solid body, heat action.

PAGE 1102

NUMERICAL MODEL OF THE TEMPERATURE

CONDITIONS OF THE HORIZONTAL GROUND

COLLECTOR

B. I. Basok, B. V. Davydenko, and A. A. Lunina

UDC 697.329:621.577.22

A numerical method for solving the problem of heat transfer in the ground mass with a horizontal ground

collector embedded in it is proposed. Using calculations on an acting ground heat exchanger of the type of

a ground–heat transfer medium of a heat-pumping plant as an example, we have determined the operating

temperature conditions of the above collector.

Keywords: ground collector, horizontal ground heat exchanger, heat-pumping plant.

PAGE 1114

SOLUTION OF NONSTATIONARY PROBLEMS OF CONTACT

MELTING IN BINARY EUTECTIC SYSTEMS WITHOUT

MUTUAL SOLUBILITY IN THE SOLID STATE

M. K. Zhekamukhov and F. B. Zholaeva

UDC 541.123.7; 669.017.3

The criteria of quasi-stationarity of the processes of diffusion of atoms in the liquid interlayer formed during

contact melting of solid bodies in an eutectic system have been established. The conditions of phase transformation

of the crystals that form the eutectic pair have been formulated with account for their densities. It is

shown that the boundaries of phase transformation of these crystals move by the parabolic law under the conditions

of the quasi-stationary nature of diffusion processes in a melt.

Keywords: contact melting, binary eutectic systems, diffusion of atoms in a melt, liquid interlayer.

PAGE 1127

HYDROGASDYNAMICS IN TECHNOLOGICAL PROCESSES

CRISIS OF A VORTICITY SOURCE DURING HEAT

SUPPLY WITH REGARD TO THE REAL PROPERTIES

OF A DIATOMIC GAS

A. N. Kucherov

UDC 533.6+535.211

On the example of a diatomic gas consisting of a mixture of nitrogen and oxygen (air), the characteristics of

energy-consuming vorticity source flow were investigated, with the dependence of heat capacity on temperature

being taken into account. The statement of this problem undergoes a change if account is taken of the

dependence of heat capacity and adiabatic index on temperature in the range from several hundred to several

thousand degrees Kelvin (a calorically nonideal gas). The phenomenon of a thermal crisis, that is, choking of

a stationary flow on attainment of unity by the radial component of the Mach number, was studied. The characteristic

dimensions of the heating region and the characteristic time of heating have been determined. Estimations

of the error incurred in a model of an ideal gas with constant heat capacity and adiabatic index

have been made. The dependences of the characteristics of the vorticity source on the gas circulation and

flow rate, as well as on the position of the energy supply region and its extension were investigated.

Keywords: vorticity source, heat capacity of a diatomic gas, circulation, flow rate, energy supply, Mach number,

thermal crisis.

PAGE 1135

LOCALIZATION OF THE POINTS OF LEAKAGE

IN AN OIL MAIN PIPELINE UNDER NONSTATIONARY

CONDITIONS

K. R. Aida-zadea,^{b} and E. R. Ashrafova^{b}

UDC 622.69

Within the framework of the theory of optimal control, problems on the localization of the points of oil leakage

from a transport pipeline system and on the determination of the rate of these leakages were investigated.

Analytical formulas for the gradient of the functional that determines the deviation of oil flow conditions at

the given points of a pipeline section from the calculated ones were obtained. These formulas allow one to

use numerical methods of first-order optimization for solving the problem posed. Some results of numerical

experiments are given.

Keywords: optimal control, point of leakage, leakage rate, gradient of a functional, lumped source.

PAGE 1148

SEMIEMPIRICAL METHOD FOR ESTIMATING

THE NOISE OF A PROPELLER

V. F. Samokhin

UDC 534.83:629.7

A semiempirical method for estimating the noise of a propeller on the basis of the Lighthill analogy is proposed.

The main relations of the computational model for the acoustic-radiation power have been obtained

from a dimensional analysis of the general solution of the inhomogeneous wave equation for the pulsed

acoustic radiation from a propeller. A comparison of the calculation and experimental data on the acousticradiation

power and the one-third octave spectra of the sound pressure of four- and eight-blade AV-72 and

SV-24 propellers is presented.

Keywords: aircraft noise, propeller noise, airplanes.

PAGE 1157

NUMERICAL MODELING OF ELECTRO-VORTICAL

FLOWS IN A CONFINED VOLUME

O. V. Kazak and A. N. Semko

UDC 537.84

The electro-vortical flow of a metal melt in a confined volume has been investigated for various electromagnetic

and hydrodynamic regimes. The melt motion was described by magnetic hydrodynamic equations for an

incompressible isothermal fluid. A strategy for solving the problem with the use of standard packages of applied

programs has been developed. The laminar flow of the melt at small Reynolds numbers, for which there

is a known solution, as well as the turbulent flow, for which there are experimental data, have been calculated.

In calculating the turbulent flow, various turbulence models were used. It has been shown that the

k–ε and k–ω models describe satisfactorily the electro-vortical flow of the melt and agree well with experimental

data. The good agreement between the results of calculations made with the use of various methods

and packages of applied programs, as well as between theoretical and experimental data, point to the reliability

of the developed methods and approaches and the validity of the obtained results.

Keywords: Lorentz force, turbulent electro-vortical flow, numerical simulation.

PAGE 1167

MAGNETOGASDYNAMIC SHOCK WAVES

IN A NONIDEAL GAS WITH HEAT CONDUCTION

AND RADIATION HEAT FLUX

K. K. Singh and B. Nath

UDC 533.6

The purpose of this study is to obtain a self-similar solution of the problem of propagation of a magnetogasdynamic

shock wave in a nonideal gas with heat conduction and radiation heat flux in the presence of a spatially

decreasing azimuthal magnetic field strength. The initial density of the medium is assumed to be

constant. The heat conduction is expressed in terms of Fourier’s law, and the radiation is considered to be

of a diffusion type for an optically thick gray gas model. The thermal conductivity and absorption coefficients

are assumed to vary with temperature and density. The shock is assumed to be driven by a piston moving

with a variable velocity. Similarity solutions are obtained, and the effects of variation of the gas nonidealness

parameter and Alfven–Mach number on the flow field behind the shock are investigated.

Keywords: shock wave, magnetogasdynamics, nonideal gas, self-similar flow, heat transfer effects.

PAGE 1179

TRANSFER PROCESSES IN LOW-TEMPERATURE PLASMA

ADIABATIC EXPANSION OF CLUSTERING CARBON PLASMA.

SELF-CONSISTENT CALCULATION

N. I. Alekseev,^{a,b} B. I. Reznikov,^{a} B. G. Zhukov^{a,}

S. V. Bobashev,^{a} and K. V. Tverdokhlebov^{a}

UDC 532.525, 537.523

Self-consistent calculation of the stationary problem on radially symmetric adiabatic expansion of low-intensity

carbon plasma has been performed. The initial conditions for plasma expansion correspond to the conditions

of the outlet cross-section of the electromagnetic rail plasma accelerator — the railgun. In the course of solving

the problem, we determine the temperature, pressure, and concentration of plasma components, as well as

of carbon clusters, beginning from the moment at which the clusterization becomes substantial. It has been

shown that a small part of the flow of carbon atoms (less than 1%) is subjected to clusterization in a wide

range of conditions, and the process of clusterization itself proceeds in a narrow three-dimensional layer. Beyond

this layer the percentage of carbon atoms transforming to clusters remains almost the same, and the

rate of decrease in the temperature with the coordinate drops considerably as compared to the rate before the

beginning of clusterization. The results of the calculation have been compared with the results of the essentially

similar calculation of the carbon clusterization under the conditions of a fullerene arc.

Keywords: railtron, rail accelerator, plasma jet, carbon clusters.

PAGE 1189

DRIFT MODEL OF A GLOW DISCHARGE WITH ACCOUNT

FOR THE NONLOCAL VALUE OF THE ELECTRIC FIELD

STRENGTH IN THE IONIZATION SOURCE

A. I. Saifutdinov and B. A. Timerkaev

UDC 537.525

A drift model of a glow discharge is proposed, which takes account of the nonlocal dependence of the ionization

source on the electric field strength. The problem is reduced to solving a nonlinear differential equation

of second order for the strength squared using the Newton–Kantorovich quasilinearization method.

Keywords: glow discharge, cathode region, cathode layer, negative glow, Faraday dark space, ionization

source, nonlocality of ionization processes, Newton–Kantorovich quasilinearization process.

PAGE 1202

MISCELLANEA

INTERDIFFUSION COEFFICIENTS

IN ACTUAL GASEOUS SYSTEMS

A. F. Bogatyrev and M. A. Nezovitina

UDC 533.15+546.21

Interdiffusion coefficients of ten gaseous pairs have been measured as functions of pressure at different temperatures.

The measurements were performed by the two-bulb and stationary flow methods. The data obtained

have been compared to the results of calculation from the formulas of rigorous and elementary kinetic theories.

It has been shown that calculation from the formula obtained within the framework of the elementary kinetic

theory is consistent with experiment within the experimental error.

Keywords: gases, interdiffusion coefficient, experiment, molecular-kinetic theory.

PAGE 1208

SOME STATISTICAL CHARACTERISTICS

OF THE ROUGH SURFACE OF HUMAN SKIN

V. V. Barun and A. P. Ivanov

UDC 535.016, 535.311, 535.36, 57.012.3, 612.79

The statistical properties of the skin surface have been described with the use of two approaches. The first

approach is based on the probabilistic description of the skin topology at a given distribution density of

rough surface heights and its correlation function. The Gaussian and quasi-periodic surfaces, whose parameters

were estimated from the literature data, have been considered. The second approach is based on the application

of the directional distribution function of microsurfaces of the skin. In the approximation of

geometric optics, the shadowing effects of surface relief elements, as applied to the human skin, have been investigated.

The changes in the probability density of heights and slopes of parts of the surface irradiated with

a directed beam due to the shadow regions have been estimated. The influence of shadowings on the electromagnetic-

field-quadratic photometric characteristics of the scattered light has been investigated. The results

obtained are of interest for solving direct and inverse problems of biomedical optics — for analyzing the radiation

fields in the biotissue and recovering its parameters by optical methods.

Keywords: skin, rough surface, reflection of light, probability density, correlation function, shadow, luminous

intensity, biotissue.

PAGE 1215

PLANE WAVES IN A TRANSVERSELY ISOTROPIC

ROTATING MAGNETOTHERMOELASTIC MEDIUM

Baljeet Singh^{a} and Anand Kumar Yadav^{b}

UDC 136.21

The governing equations for a transversely isotropic rotating magnetothermoelastic medium are solved, giving

a cubic velocity equation, which is indicative of three plane waves. Some limiting cases are considered: in the

absence of anisotropy, rotation, and thermal and magnetic effects. The effects of the anisotropy, rotation, thermal

and magnetic parameters on the speeds of plane waves are shown graphically.

Keywords: anisotropic thermoelasticity, rotation, magnetic field, plane waves.

PAGE 1226

STUDY OF PLASTIC DEFORMATION OF THE SURFACE

OF AN Ni2MnGa SINGLE CRYSTAL BY THE INDENTATION

METHOD

O. M. Ostrikov,^{a} A. L. Sozinov,^{b} and A. V. Soroka^{b}

UDC 548.24

Distinctive features of plastic deformation of a magnetic Ni2MnGa alloy are studied by the method of local

dosed deformation. It is found that the martensite phase of an Ni2MnGa single crystals is susceptible to mechanical

twinning. Here twins represent thin lenses formed away from the imprint of the indenter.

Keywords: magnetic alloy with shape memory, plastic deformation, Ni2MnGa, Heusler alloy, twinning, indentation,

martensite, austenite.

PAGE 1233