Viktor A. Nesterov

Ultrasonic radiators for the action on gaseous media at high temperatures

The article is devoted to the study of influence of high temperature on the operation of the ultrasonic disk radiator intended for generation of high-intensity vibrations in gaseous media. As a result of researches it was determined, that temperature increase of gas and the radiator led to the rise of vibration amplitude of the surface of the disk radiator and the fall of level of acoustic pressure owing to the reduction of gas density.

Increase of separation efficiency in the inertial gas-purifying equipment by high-intensity ultrasonic vibrations

This article describes the prospects of applying of ultrasonic vibrations to increase efficiency of gas-dispersed flow separation on the example of the vortex tube. Developed model of the separation of gas-dispersed flow containing solid particles is described. The specific feature of the model is in consideration of particle coagulation caused by high-intensity ultrasonic vibrations. The characteristics of the gas flow and ultrasonic influence providing minimum separation time of solid fine particles and continuous phase are determined.

Development of the equipment for ultrasonic treatment of biological tissues with simultaneous spraying of medicines

The article is devoted to the development of the equipment for contact-free energy action of high-intensity ultrasonic vibrations for practical treatment of biological tissues with simultaneous spraying of medicines. The model of the apparatus, which was able to provide necessary treatment of biological tissues, was developed. The results of measurements of distribution of ultrasonic vibration intensity of the disk radiator were obtained, disperse composition of the aerosol was determined.

The development of ultrasonic welder for the formation of continuous welding seams

The paper is devoted to the design of formation of continuous seam by the ultrasonic welding. The base of the device is developed vibrating system consisting of the piezoelectric transducer of longitudinal ultrasonic vibrations with the working tool, which provides the transformation of longitudinal vibrations into radial ones. Designed welder helps to achieve tight joint of thermoplastic materials with different thickness due to the regulation of broaching speed and amount of clearance between the bearing and the working tool.

Effciency increase of the dust-extraction plant by high-intensity ultrasonic action

The article presents the results of the studies aimed at the ways of efficiency increase of the dust-extraction unit operation on the base of Venturi pipe due to action of high-intensity ultrasonic vibrations. Carried out theoretical analysis of dust-extraction unit operation let determine the possibility of efficiency increase and dust reduction of gas at the output of the plant at the application of ultrasonic action.

Revealing of optimum modes of ultrasonic coagulation of submicron particles and determining of the shape of the aggregates by mathematical modeling

The article presents the results of studying of the process of aggregate formation at the ultrasonic coagulation of submi-cron particles. The results are obtained on the base of mathematical modeling of translatory motion and rotary motion of the couple of particles under the action of ultrasonic field. The novelty of proposed model is in the fact that specific feature of flow of small-scale particles (less than 1 μm) by continuous medium at the deflection of their form from spherical is taken into consideration. Obtained results let formulating requirements to the radiators of ultrasonic vibrations for realization of the coagulation process with maximum efficiency.

The development of experimental sample of ultrasonic equipment for the intake of lunar soil

The article is devoted to the development of experimental sample of ultrasonic equipment for carrying out investigations on drilling of the simulator of lunar soil. Carried out studies show possibility in principle of drilling of the simulator (intake) of lunar soil at application of ultrasonic vibrations on working tool.

Determination of optimum conditions of ultrasonic cavitation treatment of high-viscous and non-Newtonian liquid media

The article presents the results of theoretical and experimental studies aimed at the determination of optimum conditions of the ultrasonic action (geometry of the technological volume) for the cavitation treatment of high-viscous and non-Newtonian liquids. Developed model of the generation of the cavitation area lets determine distribution of the cavitation zone in the technological volumes of various sizes and forms. Carried out experimental studies allow prove adequacy of the proposed model and possibility to increase the volume of developed cavitation zones by the optimization of the conditions of ultrasonic action.

Study of interaction of cavitation zone with interphase boundary for the determination of efficient modes of ultrasonic intensification of physical-chemical processes

The article describes the model of the interaction of cavitation zone formed under the action of ultrasonic vibrations and interphase boundary of gas and liquid media, which spreads on solid surface in the form of liquid layer. It is shown that this interaction leads to the generation of capillary waves and consequently to the increase of efficiency of physical-chemical processes due to enlarged “liquid-gas” boundary. The analysis of the model allows determining square of interphase surface in dependence on amplitude, frequency of ultrasonic oscillations and liquid properties. It allows to determine the modes of ultrasonic action, which is necessary for maximum increase of contact surface area, in turn it leads to the growth of speed of the realization of physical-chemical processes based on surface interaction of dissimilar substances. As a result of the analysis it was determined that the most appropriate frequency of ultrasonic action is 60 kHz, at which increase of contact surface from 200 to 780 m2/m3 (at 5 mm thickness of liquid flm) can be achieved.

Determination of requirements and development of experimental setup for studying of ultrasonic absorption intensification

The paper presents the development and determination of demands to the experimental setup for research of the effectiveness of ultrasonic intensification of gas component absorption by liquid. The theoretical studies of absorption kinetics carried out for the determination of requirements to the setup. Determinated requirements based on the theoretical results for the geometrical dimensions of technological volume, which will be place for absorption process, the oscillation frequency, power of ultrasonic transducer, the area of the radiating surface, the fluid flow in absorber and pneumatic pressure of absorbed gas. In accordance with the determined requirements, the proposed, developed and realized the setup, which can be applied to determine the modes and conditions of ultrasonic influence for maximum absorption efficiency.