Vladimir N. Khmelev

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.

Study of possibility of ultrasonic coagulation in air flow

In the article the results of the experiments on determining the possibility of ultrasonic coagulation of aerosol in air flow. The experiments were carried out at different rate of air flow. It is shown, that the application of ultrasonic influence allows to increase purification efficiency of gas flow in 3 to 6 times depending on flow rate.

Revelation of optimum modes of ultrasonic influence for atomization of viscous liquids by mathematical modelling

In the article the process of cavitation low-frequency (up to 250 kHz) ultrasonic atomization of viscous liquids in a layer is investigated. It takes place with entering of acoustic energy to working zone through liquid. To reveal optimum modes of ultrasonic influence depending on physical properties of atomized liquid (viscosity, surface tension, etc.) the model describing stepwise transformation of mechanical vibration energy of ulrtasonic frequency into energy of capillary waves providing the formation of drops was proposed and developed. For the first time we offer theoretical explanation of essential dependence of drop diameter on vibration amplitude of spraying surface based on changes of mean thickness of ridges of capillary waves according to their amplitude due to occurence of nonlinear effects. Obtained results can be a base for the design of specialized ultrasonic atomizers of liquids with high viscosity for the formation of aerosols with specified productivity and dispersed features.

Optimization of these modes and conditions of ultrasonic influence on various technological mediums by mathematical modeling

This paper proposes new approach based on mathematical modeling to optimization modes and conditions of ultrasonic influence to increase efficiency of technological processes. For the analysis of processes, a general ultrasonic technological processes scheme taking into account the main physical effects that determine the course of processes depending on the physical state and location of the active medium with respect to the treated passive protection, which limits the active medium. The feature of the mathematical model of ultrasonic process is accounting for viscous effects in gas and liquid active medium that have not been previously investigated. Taking into account their impact the optimal modes and conditions of ultrasonic treatment were calculated. Determined optimal modes and conditions will provide the development of specialized ultrasound equipment for industrial applications 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.

The method of indirect control of the parameters of cavitating liquid media

The article is devoted to the method of indirect control of the properties of liquid technological media during the influence of ultrasonic high-intensity vibrations on them. As a result of the studies it was stated and proved the possibility of control of acoustic properties of processed technological media at different intensities of ultrasonic influence on changes of electric parameters of the piezoelectric ultrasonic vibrating systems.

Evaluation of the area of intensive coagulation of dispersed-phase particles in emulsion and suspension due to high-intensive ultrasonic treatment

The article is devoted to studying of intensification of stable emulsions and suspensions separation process under the action of ultrasonic treatment.

Modeling of Contact Ultrasonic Extraction of Wound Contents and Development of Means for Its Realization

The paper presents results of researches about evaluation of optimum modes and conditions ofxa0contact ultrasound influence on wound surface to remove (extract) pathological contents (infectant). Inxa0order to optimize modes and conditions of process, physical and mathematical model of converse ultrasonicxa0capillary effect was proposed. The model allows to determine extraction rate depending on infectantxa0physical properties, vibrations amplitude and structural characteristics of the radiator. Evaluated optimumxa0modes and conditions allow to develop and to make ultrasonic waveguide-tools for implementation ofxa0extraction process. Made waveguide-tools were recommended to use in specialized medical surgery and conservative therapy devices.

Experimental Investigations of the Effectiveness of Acoustic Vibration Influence of Ultrasonic Frequency on Fogs

Results of development of piezoelectric ultrasonic radiators (in form of flexural-vibratingxa0titanium disks) for gas mediums are presented in this article. Results of investigations of usage efficiencyxa0of these radiators for fogs destruction are pointed. These radiators allow creating maximal level of soundxa0pressure in range from 140 to 150 dB, in frequency range 27±2.0 kHz and ensure reducing a self-destructionxa0time of fogs into aerosol chamber up to 11.5 times.

The development of the equipment for ultrasonic defoaming for industrial application

This paper is devoted to the development of equipment of industrial applications. The model setup that can provide various types of extinguishing foams in industrial scale. The results measure the distribution of vibration amplitude, sound pressure level of the emitting surface of the disk radiator step-variable form.