共查询到20条相似文献,搜索用时 15 毫秒
1.
B. N. Yudaev O. V. Tsirlin A. A. Yushkin 《Journal of Engineering Physics and Thermophysics》1973,25(4):1257-1262
A method is proposed for calculating the velocity of a gas bubble during a steady lift in a liquid, on the assumption that the bubble transmits to the medium an array of weak waves.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 4, pp. 656–662, October, 1973. 相似文献
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V. A. Sosinovich V. A. Tsyganov B. A. Kolovandin B. I. Puris V. A. Gertsovich 《Journal of Engineering Physics and Thermophysics》1995,68(2):164-175
A system of equations for evolution of the size spectrum of gas bubbles as a results of their breakup in an isotropic turbulent damped flow of an incompressible liquid is derived and solved numerically.Academic Scientific Complex A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 68, No. 2, pp. 192–204, March–April, 1995. 相似文献
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B. N. Yudaev O. V. Tsirlin A. A. Yushkin 《Journal of Engineering Physics and Thermophysics》1977,32(6):630-638
The solution of the problem of growth of a gas-vapor bubble injected into a liquid is obtained. The growth of the bubble depends on mass transfer in the gas phase and heat transfer in the liquid phase. Experimental and theoretical data are compared.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 32, No. 6, pp. 978–989, June, 1977. 相似文献
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Packings of non-cohesive grains, immersed in a fluid, differ significantly from classical porous media as the grains, subjected to stresses and flows, can move within the sample, changing then the local properties
of the material. We study experimentally the conditions for a gas to pass through a layer of immersed granular material. Above
a threshold pressure, which depends mainly on the grains size and on the surface free energy of the liquid-gas interface,
the gas creates a channel within the whole thickness of the layer.
Received: 23 January 2002 相似文献
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I. P. Ginzburg V. A. Surin A. A. Bagautdinov A. S. Grigor'yants L. I. Shub 《Journal of Engineering Physics and Thermophysics》1977,33(2):879-887
The results of an experimental investigation of the discharge into a liquid of a gas stream from an immersed nozzle, positioned at an arbitrary angle to the surface, are presented. It is assumed that the gas is not dissolved in the liquid, i.e., it is nonassimilable.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 33, No. 2, pp. 213–223, August, 1977. 相似文献
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I. S. Grachev D. T. Kokorev V. F. Yudaev 《Journal of Engineering Physics and Thermophysics》1973,25(3):1105-1109
The instant of separation of a gas bubble from a liquid occupying a vibrating capillary at Reynolds numbers of Re < 100 is considered. The dimensions of the bubble are determined analytically in relation to the amplitude and frequency of vibration of the capillary. The results are compared with experiment. Three basic conditions of bubble formation are distinguished.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 3, pp. 424–429, September, 1973. 相似文献
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The conditions of the excitation of a pulsed plasma discharge on the surface of a processed metal (copper) sample immersed in a conducting aqueous solution have been studied. Cathode polarization of the metal was provided by a high-voltage capacitor bank (4??F) charged to U = 200?C1100 V after each discharge. It is established that electric breakdown with a duration not exceeding 0.1 ??s is always preceded by the formation of small hydrogen bubbles (with radii r ?? 37?C40 ??m) on the polarized metal surface, which takes about 139?C159 ??s. A mechanism of passivation of the processed metal surface by these hydrogen bubbles, which are synchronously shot off from the electrode surface under the action of the spark discharge, is proposed. Consistent matching of the experimental data and model calculations is used to estimate the main parameters determining the kinetics of bubble detachment from the electrode surface at various voltages U on the capacitor bank. 相似文献
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Yu. K. Bratukhin 《Journal of Engineering Physics and Thermophysics》1977,32(2):152-156
The problem of the thermocapillary convection in an unevenly heated liquid near a gas bubble is solved analytically. Estimates are given for the velocity of drift and the shape of the bubble and the vortex boundary.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 32, No. 2, pp. 251–256, February, 1977. 相似文献
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The features of evolution of detonation waves in bubble liquid containing bubbles, some of which consist of combustible gas mixture and others of which contain inert gas, have been considered. The dynamics of inert bubbles against the background of a detonation wave appearing because of bubbles of the combustible gas mixture has been studied. 相似文献
11.
E. A. Smorodov 《Technical Physics Letters》2006,32(4):340-342
It is suggested to introduce a new term into the equation describing the cavitation bubble dynamics in a polar liquid that takes into account a finite relaxation rate of dipole molecules of the liquid during rapid collapse of the bubble. It is shown that solutions of the modified equation provide significantly lower values of the thermodynamic parameters of the gas at the end of the collapse, so that thermal mechanisms of the high-energy processes accompanying cavitation cannot be operative. A substantial difference between commonly accepted notions and the proposed physical mechanism of accumulation of the acoustic field energy is demonstrated, whereby the energy is concentrated in the electrostatic field of oriented dipoles rather than in the form of the energy of compressed gas in the cavitation bubble. Experimental data are presented that confirm the proposed model. 相似文献
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A. N. Zharov 《Technical Physics Letters》1998,24(11):849-850
It is shown that unlike the case of a liquid droplet, the critical strength of a uniform electrostatic field required for
instability of a gas bubble in a liquid dielectric decreases as the compressibility of the gas in the bubble increases.
Pis’ma Zh. Tekh. Fiz. 24, 49–54 (November 12, 1998) 相似文献
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E. D. Kurtsman 《Journal of Engineering Physics and Thermophysics》1968,14(1):90-91
An equation is presented for the growth of a stationary spherical gas bubble in a finite spherical liquid volume, for which the familiar Rayleigh equation is the zero-order approximation. The results of computer solutions of the derived equation and the Rayleigh equation are compared. 相似文献
14.
V. Sh. Shagapov S. A. Lepikhin M. N. Galimzyanov 《Journal of Engineering Physics and Thermophysics》2007,80(6):1206-1209
A steady flow of a bubble gas-liquid mixture in a nozzle having a circular cross section has been investigated. The possibility
of realization of superhigh temperatures and pressures in the gas phase of the mixture in the region near the smallest cross
section of the nozzle has been analyzed. The influence of the initial radius of the flow and the volume content of bubbles,
determining the volumetric rate of flow of the liquid supplied to the nozzle, on the pattern of the flow has been considered.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 6, pp. 134–137, November–December, 2007. 相似文献
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V. E. Nakoryakov O. N. Kashinskii V. I. Shevchenko 《Journal of Engineering Physics and Thermophysics》1987,52(2):125-129
The results of an experimental investigation of the characteristics of ascending gas-liquid flow in a pipe for gas bubbles of different diameters are given.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 52, No. 2, pp. 181–186, February, 1987. 相似文献
17.
V. I. Kuznetsov 《Journal of Engineering Physics and Thermophysics》1965,9(2):101-102
The case of one-sided heat transfer to a flat plate immersed in a flow of heated liquid is examined. Equations are obtained for the liquid temperature distribution in the boundary layer, and for the heat flux from the liquid to the wall. 相似文献
18.
The problem on generation of shear waves in gas by a vibrating surface is considered in view of the properties of the surface. The problem is solved by two methods, namely, by analytic method using hydrodynamic equations and by the moments method using kinetic equation. Comparison of the respective results is made. 相似文献
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S. Gnyloskurenko A. Byakova T. Nakamura O. Raychenko 《Journal of Materials Science》2005,40(9-10):2437-2441
This paper presents experimental results of the surface phenomena effect on bubble formation from a single orifice in water and at nozzle in liquid aluminium with gas blowing at small flow rates. The usage of coated orifice in water and nozzles of different materials in the melt realized wide range of contact angles. The meaningful stages, termed (1) nucleation period, (2) under critical growth, (3) critical growth and (4) necking, were identified during bubble formation in a regime referring to simultaneous forced flow and surface tension control. It was revealed that bubble formation is substantially dominated by hysteresis of contact angle. Evolution of interface equilibrium and force balance conditions distinctive for bubble formation is clarified. X-ray fluoroscope was used to carry out in-situ observation of bubble formation in the melt. It was shown that bubble volume increased with wettability worsening both for aqueous and metallic systems. A further insight into the mechanism of the bubble formation was obtained by comparison of the bubble behaviour at the tip of the injection devices in liquid aluminium and at the orifice in water. 相似文献