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81.
A microinhomogeneity-averaged model of the kinetics of the trapping process is proposed for a porous medium in which two fluids are mutually displaced. The traps are treated as a new hydrodynamic phase, and the trapping process as a phase transition. Kinetic relations for the average trapping process are obtained. The structure and quantitative values of the kinetic coefficients are obtained for a model of a porous medium in the form of a system of doublets. The dependence of the characteristic time of the process on the degree of inhomogeneity of the medium is investigated. A variant of the macroscopic model of the process of two-phase flow, in which the kinetic relations obtained are used as the closing relations, is proposed.Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 3, pp. 92–101, May–June, 1995. 相似文献
82.
It is shown that a multicomponent two-phase system moving through a porous medium may be described by a limit model in which
the thermodynamic subsystem is totally separated from the hydrodynamics. The limit corresponds to a contrast phase mobility
and a fast pressure relaxation process. The obtained limit thermodynamic model includes several differential thermodynamic
equations and describes the equilibrium in an open system. The model is validated by comparing with the full compositional
flow simulations. A numerical solution to the limit thermodynamic model is constructed. An application to the gas-condensate
systems is compared to the full compositional model. 相似文献
83.
84.
85.
M. B. Panfilov 《Fluid Dynamics》1995,30(4):578-585
Models described by parabolic equations with a rapidly oscillating nonperiodic right side are investigated by means of averaging theory methods. For a nonperiodic perturbation field a combined homogenization and effective medium method is developed. This method makes it possible to obtain the solution of the cell problems in a finite form correct to the second order in the inhomogeneity parameter. The method is applied to problems of single-phase and two-phase flow through porous media. The technique of the method is outlined and explicit solutions of cell problems are constructed.Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 4, pp. 108–115, July–August, 1995. 相似文献
86.
The time-resolved laser magnetic resonance (LMR) method has been applied to kinetic measurements for the first time. An intracavity spectrometer based on a CO2 laser with resonant modulation of the magnetic field and with phase-sensitive detection of the signal has been used. Kinetic curves of generation and disappearance of CI atoms and SiH3 radicals were obtained in the pulse photolysis of a mixture of S2Cl2 + SiH4 under the fourth harmonic of a Nd laser (265 nm, 0.5 mJ, 12.5 Hz) at a total pressure of 520–980 Pa (he as diluent) and a temperature of 326 K. The reagent concentrations were: [S2Cl2 = (2.0?10.2)×1014 cm?3, [SiH4 = (2.4?17.4)×1013 cm?3. To remove the transition saturation, 5.3×1015 cm?3 CCl4 was introduced into the reactor. The fraction of dissociated S2Cl2 was 1‰ Rate constants of the reactions (I) Cl+S2Cl2 → products, (II) Cl+SiH4 → HCl+SiH3 and a preliminary rate constant of the reaction (III) SiH3 + S2Cl2 → products were obtained: k1 ≤ (4.3±1.2)×10?12 cm3/s, k2 = (2.3±0.5)×10?10 cm3/s, k3 = (2.4±0.5)×10?11 cm3/s. At a signal-to-noise ratio of 1:1, 1000 pulses and a 12 cm long detection zone the sensitivity to Cl atoms and to SiH3 radicals was 4×1010 cm?3 and = 1011 cm?3, respectively. The time resolution of the method was 4 μs. The method is shown to be promising for kinetic investigations and experiments on fast processes. 相似文献
87.
One of the fundamental mechanisms for the onset of turbulence in 3D excitable media is negative filament tension. Thus far, negative tension has always been obtained in media under low excitability. For this reason, its application to normal (nonischemic) cardiac tissue has been questionable, as such cardiac turbulence typically occurs at high excitability. Here, we report expansion of scroll rings (low curvature negative filament tension) in a medium with high excitability by numerical integration of the Luo-Rudy model of cardiac tissue. We discuss the relation between negative tension and the meandering of 2D spiral waves and the possible applications to cardiac modeling. 相似文献
88.
Avrorin A. D. Avrorin A. V. Aynutdinov V. M. Bannash R. Belolaptikov I. A. Brudanin V. M. Budnev N. M. Doroshenko A. A. Domogatsky G. V. Dvornický R. Dyachok A. N. Dzhilkibaev Zh.-A. M. Fajt L. Fialkovsky S. V. Gafarov A. R. Golubkov K. V. Gres T. I. Honz Z. Kebkal K. G. Kebkal O. G. Khramov E. V. Kolbin M. M. Konischev K. V. Korobchenko A. P. Koshechkin A. P. Kozhin V. A. Kulepov V. F. Kuleshov D. A. Milenin M. B. Mirgazov R. A. Osipova E. R. Panfilov A. I. Pan’kov L. V. Petukhov D. P. Pliskovsky E. N. Rozanov M. I. Rjabov E. V. Rushay V. D. Safronov G. B. Simkovic F. Skurikhin A. V. Shoibonov B. A. Solovjev A. G. Sorokovikov M. N. Shelepov M. D. Shtekl I. Suvorova O. V. Tabolenko V. A. Tarashansky B. A. Yakovlev S. A. Zagorodnikov A. V. Zurbanov V. L. 《JETP Letters》2018,108(12):787-790
JETP Letters - The Advanced Laser Interferometer Gravitational-Wave Observatory and Advanced Virgo observatories recently discovered gravitational waves from a binary neutron star inspiral. A short... 相似文献
89.
Using a computational model of a coupled reaction-diffusion-mechanics system, we find that mechanical deformation can induce automatic pacemaking activity. Pacemaking is shown to occur after a single electrical or mechanical stimulus in an otherwise nonoscillatory medium. We study the mechanisms underpinning this effect and conditions for its existence. We show that self-organized pacemakers drift throughout the medium to approach attractors with locations that depend on the size of the medium, and on the location of the initial stimulus. 相似文献
90.
Panfilov AV 《Physical review letters》2002,88(11):118101
We study numerically how the intercellular conductance affects the process of spiral breakup in an array of coupled excitable cells. The cell dynamics are described by the Aliev-Panfilov model, and the intercellular connection is made via Ohmic elements. We find that decreasing intercellular conductance can prevent the breaking up of a spiral wave into a complex spatiotemporal pattern. We study the mechanism of this effect and show that the breakup disappears because of increasing the diastolic interval of an initial spiral wave. 相似文献