Evaporation of ‘lubricating agent’ in thermal treatment of technical synthetic fibers

A mathematical model of the evaporation of a water-emulsion mixture (lubricating agent) in thermal treatment of a synthetic fiber is suggested. It is based on an approximation of interpenetrating continua. A substantial effect of deformation heat losses on the evaporation-front motion is shown. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 1, pp. 85–89, January–February, 1996.     

Hardness of coatings of various filler materials in electric-arc metallization

The effect of the electrode material on the hardness of coatings in electric-arc metallization is studied experimentally. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute,” National Academy of Sciences of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 72, No. 5, pp. 983–987, September–October, 1999.     

Initiation of detonation by burning jets

We carried out an experimental investigation of the initiation of a detonation wave by burning jets at the orifice plate outlet. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute of the Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 1, pp 26–32, January–February, 1996.     

Medical instrument based on a heat pipe for local cavity hypothermia

The design and results of tests of an instrument based on a heat pipe for local cavity hypothermia are presented. The instrument is a part of a device for noninvasive nonmedical treatment of inflammatory diseases of the organs of the small pelvis, pathologies of alimentary canal, etc. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 382–385, May–June, 1996.     

Dependence of the characteristics of radiative heat exchange on the optical properties of absorbing,emitting, and scattering media and their boundary surfaces

We suggest a new hybrid numerical-analytical method for solving an integrodifferential equation of radiation transfer. We present results of an investigation of the effect of the temperature distribution and scattering properties of a medium and its absorption density as well as the emissivity of the boundary on the intensity and density of the emergent-radiation fluxes. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute of the Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 6, pp. 1014–1020, November–December, 1996.     

Rheological factor of blood flow in SHF-local hyperthermia. “Rheomed” project

Different physicomathematical models of SHF hyperthermia, viz., local, regional, and extracorporal, are considered. All biothermal problems within the “Rheomed” project are solved analytically and numerically in conjugate formulations. Among the main advantages of the project is a new universal model of nonisothermal perfusion that is based on temperature-time superposition. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 356–359, May–June, 1996.     

Concerning the mechanism of thermal destabilization of an arc discharge

We examine the destabilization of arc discharges blown by a stream of a heated gas in the channel of a vortex plasmatron. A multitude of destabilizing factors of hydrodynamic and thermal origin are noted. The suggest a model of thermal destabilization due to sources of local heat generation. Experimental data on temperature fluctuations in the columns of argon and helium arcs support the model. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute of the Academy of Sciences of Belarus,” Minsk, Institute of Molecular and Atomic Physics, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 1, pp. 39–42, January–February, 1996     

Heat transfer in regional extracorporal perfusion of limbs

Two problems of heat transfer in regional perfusion are analyzed, viz., in heating of limbs by hot blood and in normothermal perfusion in combination with local SHF hyperthermia. The efficiency of the procedure in the latter case and its inefficiency in the former case are shown. The coefficient of heat transfer between a circulatory system and biotissue is estimated. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus,” Minsk; Scientific Research Institute of Oncology and Medical Radiology, Ministry of Public Health of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 434–442, May–June, 1996.     

Speckle technique for measurement of turbulence characteristics

The possibilities of speckle photography for determination of the characteristics of turbulence for gas-dynamic flows are analyzed. It is shown that by using two-exposure speckle photography, the energy spectrum and the scales of turbulence can be calculated, while one-exposure speckle photography provides information on the energy and anisotropy of turbulent pulsations. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 5, pp. 805–810, September–October, 1996.     

Thermal destruction of erythrocyte spectrin: Rheology,deformability, and stability with respect to detergents

By means of blood heating in the region of the thermal denaturation transition of spectrin (50°C) the relationship between the stability of erythrocytes with respect to detergents and their deformability and rheological parameters of blood was studied. Academic Scientific Complex “A. V. Luikov Institute of Heat and Mass Transfer, Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 360–363, May–June, 1996.     

Cathode sputtering with electrical discharge through a heavy water-saturated vapor interface

An experimental study of electrical discharge in an atmosphere of heavy-water vapor was conducted. The heavy-water surface served as the cathode. Under specific discharge conditions, intense neutron radiation induced by the discharge was observed. The dependence of the intensity of neutron generation on the discharge current was measured. Academic Scientific Complex “A. V. Luikov Institute of Heat and Mass Transfer of the Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 5, pp. 721–725, September–October, 1996.     

Linear thermodynamic systems with memory. III. Theory of thermodynamic nonequilibrium potentials

In the last paper of this series on nonequilibrium thermodynamics of linear systems with memory, methods of the theory of linear passive dynamic systems are used to construct a complete family of thermodynamic nonequilibrium potentials for the thermodynamic systems considered. it is shown by a specific example that the property of nonuniqueness of the thermodynamic potential is inherent even in very simple thermodynamic systems, and its possible physical interpretation is discussed. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 5, pp. 707–715, September–October, 1996     

Scattering of radiation in an anisotropic turbulent medium

Scattering of laser radiation on density fluctuations in propagation of radiation through an anisotropic turbulent medium is analyzed. It is shown that the deviation angles in turbulent gas flows at atmospheric pressure equal ∼10⁻⁵–10⁻⁴ rad and can be detected by means of speckle photography. A statistical analysis of two-dimensional fields of deviation angles makes it possible to evaluate three-dimensional density correlation functions in a turbulent flow. It is shown that taking account of the turbulence anisotropy leads to distributions of the laser-radiation intensity over deviation angles that deviate substantially from the Gaussian distribution. Academic Scientific Complex “A. V. Luikov Institute of Heat and Mass Transfer of the National Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 72, No. 1, pp. 96–101, January–February, 1999.     

Experimental modeling of the breakup of meteoroids in the earth’s atmosphere

Ablation of meteoroids (rock materials and ice) in high-temperature gas flows and in radiation heating is modeled experimentally, and the character of their breakup is considered. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute,” National Academy of Sciences of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 72, No. 6, pp. 1145–1148, November–December, 1999. The work was carried out under the program of the International Science and Technology Center, project B23-96.     

Investigation of the instability of an arc descharge in an air flow

Using an automated complex of spectral apparatuses that allow one to determine local profiles of averaged temperature and its oscillations in a dc arc-discharge column, we investigated the temperature instability of the arc plasma in a laminar air flow. We show that the character of oscillations corresponds to the model of thermal destabilization of discharge. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute of the Academy of Sciences of Belarus,” Minsk, Institute of Molecular and Atomic Physics of the Academy of Sciences of Belarus, Minsk. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 5, pp. 800–804, September–October, 1996.     

Emission method of investigation of the cell structure of multifront gas detonation

An emission method for measuring instantaneous and averaged parameters of the cell structure of multifront gas detonation is developed. The method is based on photoelectric detection of the dynamics of changes in the inherent emission due to combustion of the combustible mixture in the detonation wave. Academic Scientific Complex "A. V. Luikov Institute of Heat and Mass Transfer of the National Academy of Sciences of Belarus," Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 72, No. 2, pp. 201–205, March–April, 1999. The work was supported, in part, by the Foundation for Basic Research of the Republic of Belarus, grant No. 96/099.     

Effects of relaxational diffusion in film boiling of a polymer solution

Effects of relaxational diffusion during rapid evaporation of a solvent from a polymer solution taking place as a result of a thermal shock from the side of the free surface of the liquid are investigated. It is shown that, as a result of diffusional resistance to evaporation, a polymer-enriched layer is formed in the vicinity of the phase interface that can stabilize substantially the shape of the phase interface. Voronezh State University, Voronezh, Russia; Academic Scientific Complex “A. V. Luikov Institute of Hea and Mass Transfer of the Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheski Zhurnal, Vol. 69, No. 6, pp. 989–992, November–December, 1996.     

About temperature dependence of the rheological properties of human blood at low shear rates

Measurements of the human blood flow curve as a function of temperature are reported. The blood was sampled from healthy donors. The measurements were made at the shear rates from 0.2 to 5.0 sec⁻¹ in the temperature range 30–45°C. The blood flow curve was investigated by the nonstationary measurement method using a specially designed viscosimeter. An experimental study of the human blood flow curve at low shear rates allowed investigation of the temperature dependence of the Casson’s model parameters describing it. It is shown that these parameters have a complicated temperature dependence that exhibits a specific feature at 42°C. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 386–389, May–June, 1996.     

Spreading of a drop of an electrorheological suspension in an external field

We analyze the effect of a constant electric field on the dynamics of the spreading of an electrorheological suspension drop. We discovered a strong effect of the electric field intensity on the speed of spreading and shape of the drop. An empirical relationship is established between the contact spot radius and droplet height and the magnitude of the voltage supplied to the electrodes. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute of the Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 70, No. 5, pp. 766–770, September-October, 1977.     

Hormonal and metabolic changes in oncology patients subjected to general hyperthermia and ways for their correction

Hormonal-metabolic changes in oncology patients subjected to general hyperthermia (GHT) result in enhancement of free-radical oxidation and accumulation of endotoxins under the conditions of violation of their targeted transport to detoxication. A pathogenesis-matched stress-limiting program is developed that allows optimization of the GHT treatment. Scientific Research Institute of Oncology and Medical Radiology of the Ministry of Public Health of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 443–450, May–June, 1996.