Anna V. Shalunova

Ultrasonic oscillating system for radiators of gas media

In article the new construction of the multiple-unit piezoelectric transducer with the increased output power and a disk radiator, which has a refined thermal mode is offered. The designing procedure of bending vibration disk radiators is described. The developed constructions are implemented; their technical characteristics and functionality are explored.

Designing of multi-frequency source of ultrasonic action with radiator in form of stair-step disc

The article is devoted to designing of multi-frequency source of ultrasonic action with radiator in form of stair-step disc.

Study of the process of liquid atomization from the ultrasonic disk radiator

The article is devoted to the process of liquid spraying by the ultrasonic radiator in the form of disk. New functional possibilities of the ultrasonic disk radiators during liquid spraying were studied. The results of productivity and power inputs for spraying at the application of different systems of fluid supply were obtained.

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.

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.

Development of equipment for fine-dispersed atomization of viscous liquids

The article considers new technology of atomization of viscous liquids from unsteady surface with next additional atomization in spray-type needle moving out aerosol flow was considered. As a result of the researches, high efficiency of realization of secondary atomization was proved and dependences of atomization efficiency on frequency, vibration amplitude and form of the end of spray-type needle were developed. The obtained results of atomization of viscous liquids are evidence of reducing of particles of primarily sprayed aerosol by 3–4 times.

Ultrasonic atomizers of nanomaterials

The article is devoted to design of promising means of nanomaterial atomization. The construction of developed ultrasonic atomizers is described and the methods of their application are recommended.

Development of design procedure of liquid media dispenser for the atomizing drier

In the article the design procedure of liquid media dispenser for ultrasonic drying according to required parameters of atomizing drier is presented.

Compact ultrasonic atomizer having possibilities to spray in layer and in fountain

The article describes the construction of compact portable ultrasonic aerosol device, which is always ready for operation with independent power supply having possibilities to spray in a layer and in a fountain and able to form aerosol with regulated disperse compound.