Thermophysics and Aeromechanics

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010015

Kharitonov, A. M.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010027

Abstract Sergey Alekseevich Khristianovich is one of the famous Russian mechanical engineers of the 20th century together with N.E. Zhukovsky, S.A. Chaplygin, N.E. Kochin, and others. He made an immense contribution to some aspects of mechanics, such as aerogasdynamics, rock mechanics, theory of plasticity, filtration theory, and environmental power engineering. All this was preceded by a long, hard, and fruitful life full of outstanding events.

Leontyev, A. I.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010039

Abstract I remember my first encounter with S.S. Kutateladze; this was at the All-Union Conference on Self-Similarity Theory in the conference hall of the Krzhizhanovsky Power Engineering Institute of the USSR Academy of Sciences. The young generation of researchers occupied the balcony places. I remember a bright lecture of young S.S. Kutateladze, who became our “cult figure” from this moment on.

Dontsov, V. E.;Chernov, A. A.;Dontsov, E. V.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010040

Abstract The processes of breaking, solution, and formation of hydrates behind a shock wave of moderate amplitude were studied experimentally in water with carbon dioxide bubbles under different initial static pressures. It is shown that an increase in the static pressure in a gas-liquid medium leads to reduction of critical relative amplitude of the shock wave, corresponding to starting development of Kelvin — Helmholtz instability and bubble splitting into small gas inclusions behind the shock wave front. It is shown that the rates of carbon dioxide solution and hydrate formation behind the shock wave front are close by the value; their dependences on medium and wave parameters are determined. Calculations by the model of gas hydration behind the shock wave are presented.

Gubaidullin, A. A.;Sannikov, I. N.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010052

Abstract The dynamics and heat and mass exchange in the pressure wave of a vapor bubble containing a hot particle was investigated parametrically. The influence of the particle size and temperature, of the liquid temperature and static pressure, and the wave amplitude on the dynamics of such a two-phase bubble was studied. A procedure is proposed to estimate the least value of the thickness of a vapor layer around the particle.

Skokov, V. N.;Koverda, V. P.;Reshetnikov, A. V.;Vinogradov, A. V.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010064

Abstract Experiments were carried out on ultrasonic cavitation in glycerin. The zone near the emitter has a structure from interacting gas-vapor bubbles; this structure takes the form of fractal clusters. The photometry of passed laser emission was the tool for studying dynamics of fluctuations. In transitive mode, the power spectrum of fluctuation varies by the law inversely proportional to frequency. Distributions of local fluctuations are different from Gaussian and exhibit the property of scale invariance. The qualitative behavior of the frequency dependence of the spectral fluctuation density was tested while varying the power of the ultrasonic emitter. It was demonstrated that the growth of the high-frequency margin of flicker-type behavior evidences for growing instability and can be considered as a forerunner of possible large-scale outbursts.

Kuznetsov, V. V.;Shamirzaev, A. S.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010076

Abstract This paper deals with experimental results on flowboiling heat transfer of liquid moving in an annular channel with unilateral central heating under the conditions of a significant effect of capillary forces on the flow modes and heat transfer. Experiments were carried out on boiling freon R318C in an annular channel with a gap of 0.95 mm and transparent outer wall. The inner wall was heated by the electric current. The local heat transfer coefficients and flow modes are presented. The critical film thickness corresponding to suppression of nucleate boiling was determined.

Baginsky, A. V.;Shipitsina, A. S.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010088

Abstract Thermal conductivity of liquid ozone-safe refrigerant R404A was studied for the first time in the range of temperatures of 297.9–332.6 K and pressures from the saturation line to 3.7 MPa. The uncertainties of temperature, pressure, and thermal conductivity measurements were estimated to be within ±0.1 K, ±3 kPa, and ±0.15%, correspondingly. Values of thermal conductivity were calculated for liquid R404A at the boiling line. Approximating dependences for thermal conductivity were obtained for the whole range of studied temperatures and pressures, and at the boiling line.

Chinnov, E. A.;Nazarov, A. D.;Saprykina, A. V.;Serov, A. F.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S086986430701009X

Abstract Wave characteristics of the water film flow over a vertical plate with a heater were studied. Without a heat flux, data obtained perfectly coincide with results of other authors obtained for an isothermal liquid film. When heating the falling liquid, thermocapillary forces form the rivulets and thin film between them. It was found out that an increase in the heat flux causes a rise of the phase velocity and decreases the frequency of 3D waves. It is shown that in contrast to the known data for an isothermal liquid film, the average relative wave amplitude increases with a rise of dimensionless complex Reloc/Ka 1/11loc at relatively high heat flux densities in the interrivulet. The growth of wave amplitude under the action of thermocapillary forces was revealed in the interrivulet, what corresponds to calculations.

Khairulin, R. A.;Kosheleva, A. S.;Stankus, S. V.

2007 Thermophysics and Aeromechanics

doi: 10.1134/S0869864307010106

Abstract The temperature variations of the density of liquid magnesium-lead alloys were measured by the gamma-method in the temperature range from the liquidus temperature to 950–1000 K for compositions of 19.11, 33.45, 52.46, and 83.06 at. % Pb. It is shown that within the estimated errors (0.25–0.30 %), the alloy density depends linearly on the temperature. Approximation dependences ρ(T) were obtained for every studied composition together with generalizing density-temperature and density-concentration dependences for the range of 0–100 at. % Pb.