Based on the analysis of the physical processes that occur during a steam explosion, it is shown that, in plants of this type, it is necessary to provide the homogeneous-nucleation mode with the fluctuation frequency of formation of viable vapor-phase nuclei in the unit volume of liquid of at least 108 m–3 s–1 and the relative value of liquid overheating of 1. On the basis of a standard autoclave, a steam-explosion plant that meets the specified requirements is designed and manufactured.

The results of studies aimed at improving the methods and equipment for the preliminary treatment of lignocellulosic raw materials by means of steam explosion are presented. The scientific basis for the outflow of superheated steam from a reactor in the course of detonation boiling of a liquid is described. Based on theoretical and experimental studies, it is shown that, in order to provide an increase in the efficiency of the steam explosion energy, it is appropriate to mount an aerohydrodynamic grinder (AHG) containing a Laval nozzle at the reactor outlet.

The scientific foundations of liquid boiling in steam explosion installations are described. It is shown that, in order to ensure the detonation boiling mode, the installation must provide a relative value of liquid superheating close to the ultimate one and a nucleation frequency of  >108 m–3 s–1. The conditions under which the given values can be realized are determined. Based on these conditions, a steam explosion installation has been designed and manufactured. Studies are carried out on the processing of lignocellulosic raw materials on the developed installation, which show the feasibility of the proposed approach in the design of steam explosion installations.

Mathematical models of the dynamics of rigid particles during wave reconstruction of the hydrodynamic relation between a hole and a formation are considered. The conditions for cleaning productive rock from colmatant in the wave field of repression and depression are determined. The results of applying the technologies and equipment in the mode of depression-wave cleaning of the bottom-hole formation zone are given.

This paper presents the results of a numerical study of the liquid heating process during collapse of a single spherical cavitation bubble in water at a liquid pressure of 10 bar, temperature of 20°C, and an initial bubble radius of 500 μm. The simulation of this phenomenon took into account the thermal conductivity of the vapor in the bubble and the surrounding liquid, heat transfer and evaporation/condensation on the surface of the bubble, and the effects of viscosity and compressibility of the liquid. It is shown that, as a result of bubble collapse, the liquid heats up in a region of about 60 μm radius. The temperature in the center of this region is about 50°C higher than in the surrounding liquid. The thermal energy expended on heating the liquid in this region is approximately equal to 25 μJ.

The results of a numerical study of the thermal and acoustic energies released during the collapse of a single spherical cavitation bubble in water at a pressure of 10 bar and a temperature of 20°С are given. In the model used, we take into account the thermal conductivity of the vapor in the bubble and the surrounding liquid, heat transfer, evaporation/condensation on the surface of the bubble, and the fluid compressibility. The conversion of mechanical energy into heat due to the fluid viscosity is not accounted for. When the bubble collapses, the energy of acoustic radiation due to radial pulsations of the bubble is shown to be approximately nine times greater than the energy spent on heating the liquid. The value of this energy is proportional to the cube of the initial bubble radius.

В работе рассматривается возможность прогнозируемого изменения положения тонкого тела (жёсткий тонкий цилиндр), взвешенного в слое вязкой жидкости [1… 3] при импульсном движении границы канала. Локальное вязкое взаимодействие тела с жидкостью считается пропорциональным относительной скорости точки нити в двигающейся жидкости. Показана возможность перевода тела в положение, параллельное стенкам канала. Полученные результаты можно использовать в технологии изготовлениятонких пластин однонаправленного композита с короткими волокнами в качестве заполнителя. The paper considers the possibility of the predicted change in the position of a thin body (a rigid thin cylinder) suspended in a viscous liquid layer during the impulse motion of the layer boundary. The local viscous interaction of the body with the liquid is considered proportional to the relative velocity of the thread point in the moving fluid. The possibility of transferring the body to a position parallel to the walls of the channel is shown. The obtained results allow us to conclude that with short pulses it is possible to achieve that, regardless of the initially chaotic arrangement of the system of thin bodies, all of them take an equilibrium position parallel to the walls of the channel. This can be used in the manufacturing technology of thin plates of unidirectional composite with short fibers as a filler.

The use of wave generators to intensify the processes of mixing and metering model energy condensed systems is studied. The urgency of this problem is specified by the imperfection of the traditional mixers and metering devices of the system components. The mathematical modeling of the wave action is performed for some model technological processes of processing and metering systems. According to the results of mathematical modeling, the preliminary parameters are estimated and new mixers and meters are developed ensuring more efficient modes of mixing and accurate vibration metering of the model energy systems.

Th is monograph discusses the scientifi c fundamentals of resonance macroand micro-mechanics of petroleum reservoirs and its petroleum industry applications. It contains an overview of the research and engineering results of resonance macroand micro-mechanics of petroleum reservoirs, which provides the scientifi c and applied foundations for the creation of groundbreaking wave technologies for production stimulation and enhanced oil recovery. Th e monograph is intended for a wide audience: students, teachers, scientists and practitioners who are interested in the fundamentals, the development and application of leading-edge technologies in the petroleum industry and other industrial sectors.

This work is devoted to studying the compression of cavitation bubbles by viscous liquid and the rate of steam compression in it within a wide range of Reynolds numbers. The influence of heat conductivity in bubble, the compressibility of liquid and evaporation/condensation on the surface of the bubble have been studied. It has been shown that the maximal pressure inside of the bubble increases sharply in a small neighborhood of some critical value with growth in the Reynolds number. This critical value is close to the one established by Zababakhin, which separates regimes of the bubble collapse in incompressible liquid for finite and infinite times.

This chapter contains sections titled: Selecting Wave Parameters for Stimulation of Horizontal Wells Near-Wellbore Stimulation. The Induction of Resonance

An approach to viscous friction is described as nonlocal momentum exchange between different layers of a fluid. The Navier−Stokes equations are replaced by pseudo-differential equations hyperbolic in time. In this case, instead of zero velocity on the boundary, a nonlocal nonlinear boundary condition is set in the form of the velocity dependence of the coefficient before the intensity of the momentum exchange with the boundary. The non-newtonian character of the viscosity of water is shown in experiments with thin insulin needles and explained by the nonlinear character of the momentum exchange of water with the boundary. The calculations agree very well both with our experiments and with the experiments of other authors. Calculations show that the flow decreases more than one-and-a-half times in comparison with the Poiseuille flow for channels with a diameter of 360−390 μm, which is confirmed in experiments.

This chapter contains sections titled: Resonance Mechanisms Possible in Fluid-Saturated Porous Media Resonance of Two-Dimensional Axially Symmetric Waves in Horizontal Layers of Reservoir. Efficient and Directed Excitation of Wave Energy in Target Sub-Layers Resonance of Two-Dimensional Plane Waves in Reservoir Compartmentalizing Strike-Slip Faults and Fractured Zones Linked Waveguides in Compartmentalized Reservoirs. The Transfer of Oscillations into Reservoir Inner Zones under Multidimensional Resonance Conditions Experimental Determination of Resonant Frequencies of a Reservoir. Practical Recommendations for Selecting Controlled Means and Oscillation/Wave Generators