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.     

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.     

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.     

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.     

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.     

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.     

Compressor-adsorber with a heat pipe

A design and mathematical model of a compressor-adsorber employing a heat pipe are described. Based on numerical solution, the effect of the finning parameters on adsorber efficiency is analyzed. 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. 4, pp. 531–539, July–August, 1996.     

Ultrasonic investigations of brain in infants with some neurological diseases

The authors have studied 197 infants (1–12 months old) with normal psychomotor development and with various neurological disturbances. Neurosonography and dopplerometry were used to investigate the blood flow pattern and structural changes in the brain. Municipal Clinical Hospital No. 7, Minsk; Belarusian State Institute for Advanced Medical Training. Ministry of Public Health of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 505–509, May–June, 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.     

Orbitally quantized vortex states of laser radiation and photonic superfluidity

The existence of the phenomenon of photonic superfluidity in certain laser systems is demonstrated as is the identity of orbitally quantized excitations of the photonic Bose condensate to vortex lines in superfluid He and Abrikosov’s vortex lines in type-II superconductors. Physicotechnical Institute, Academy of Sciences of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 4, pp. 554–567, July–August, 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.     

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.     

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.     

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.     

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.     

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.     

The effect of changes in the intravascular pressure and blood flow rheology on malignant growth

Experiments with transplanted neoplasms have revealed that a decrease in intravascular pressure or introduction of polymers decreasing hydrodynamic resistance has an pronounced antitumor effect. Deceased. Belarusian State Institute of Advanced Medical Training, Ministry of Public Health of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 460–463, May–June, 1996.     

Measurement of particle velocity in a two-phase jet by double-exposure speckle photography

Double-exposure speckle photography was used to measure the instantaneous particle velocity field in an intense high-velocity two-phase jet. Scientific Academic Complex “A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of elarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 2, pp. 224–229, March–April, 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     

Development of computerized methods for estimation of peripheral blood circulation in children under screening investigations

Experience gained in estimation of the conditions of peripheral hydrodynamics in children with various forms of vegetative dysfunctions was used to develop algorithms for diagnosis of hemodynamic disturbances, a set of recording devices, and software using statistical probability diagnostic methods. Belarusian State University of Computer Science and Radioelectronics, Minsk; Belarusian State Institute for Advanced Medical Training, Ministry of Public Health of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 3, pp. 413–418. May–June, 1996.