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Influence of Environment Conditions on Ultrasonic and Electrostatic Precipitation of Aerosols of Wood Flour

Stepkina Maria, Kudryashova Olga, Antonnikova Alexandra

Archives of Acoustics

2020

Vol. 45, No. 1

29--34

The risk of human exposure to finely-dispersed aerosol particles being airborne indoors is determined by the size and the number concentration of particles, the intensity of an aerosol emission source, the air filtration and ventilation efficiency, etc. The emphasis in this article is on behaviour patterns of aerosol particles when exposed to ultrasonic and electrostatic fields in different conditions of air temperature and relative humidity. Wood flour having sizes of interest (characteristic particle diameter about 10 μm) is chosen as a model aerosol. The article considers a physical and mathematical model presenting the evolution of aerosol particles in external fields, taking into account the moisture content and the temperature of a dispersive medium. The efficiency of ultrasonic and electrostatic precipitation in different relative humidity and temperature conditions in an enclosed space was studied using optical measurement methods of particle size and concentration.

Acoustic excitation of electric field in water solution NaCl

Avrunin Oleg G., Bondarenko Igor S., Bondarenko Stanislav I., Kuzmenko Yulia V., Pinaieva Olga Yu., Kisała Piotr, Tleshova Akmaral, Luganskaya Saule

Przegląd Elektrotechniczny

2019

R. 95, nr 4

158--161

The electric field value has been measured in an electroconducting water solution with NaCl, arising at simultaneously action on it of ultrasound and a direct magnetic field. Basic approaches and scheme of the laboratory device are proposed and designed. The basic characteristics of ultrasonic radiation in a place of measurement of electric field are defined, proceeding from its value and the experimental installation parameters. It is possible to assume, that at constant values of intensity of radiation and a magnetic field the value of measured voltage in the set areas of a body will give the new quantitative information on an organism state. Possibility of use of measurements of electric field for studying of properties of the biological tissue is discussed.

Wartość pola elektrycznego została zmierzona w elektroprzewodzącym roztworze wodnym z NaCl, powstającym przy równoczesnym oddziaływaniu na nie ultradźwiękami i bezpośrednim polem magnetycznym. Zaproponowano i zaprojektowano podstawowe podejścia i schemat urządzenia laboratoryjnego. Określono podstawowe właściwości promieniowania ultradźwiękowego w miejscu pomiaru pola elektrycznego, wychodząc z jego wartości i eksperymentalnych parametrów instalacji. Można założyć, że przy stałych wartościach natężenia promieniowania i pola magnetycznego wartość mierzonego napięcia w zadanych obszarach ciała da nową informację ilościową o stanie organizmu. Omówiono możliwości wykorzystania pomiarów pola elektrycznego do badania właściwości tkanki biologicznej.

Changes in the fractal and electronic structures of activated carbons produced by ultrasonic radiation and the effect on their performance in supercapacitors

Venhryn B., Grygorchak I., Stotsko Z., Kulyk Y., Mudry S., Strelchuk V., Budzulyak S., Dovbeshko G., Fesenko O.

Archives of Materials Science and Engineering

2012

Vol. 57, nr 1

28-37

Purpose: Effect of ultrasonic irradiation on change of electron structure as well as fractal one of activated carbons and motivation that these changes are most responsible for the improvement of functional parameters in supercapacitors, were the aim of this paper. Design/methodology/approach: Experimental studies were carried out by means of impedance spectroscopy, cyclic voltammetry, X-Ray diffraction, small angle X-Ray diffraction, X-Ray photoelectron spectroscopy, IR-spectroscopy, Micro-Raman spectroscopy and galvanostatic cycling methods. Findings: Ultrasonic modification of carbon is effective method to increase the specific capacitance as well as power of carbon-based supercapacitors. Changes of parameters of double electric layer are tightly related with change of fractal dimension and allow increasing the percolate mobility of charge carries. Research limitations/implications: This research is a complete and accomplished work. Practical implications: Carbon materials, modified by ultrasonic irradiation, can be used as promising electrode materials in energy storage devices of new generation. Originality/value: This work is of urgent importance for studying of physical and chemical processes in energy storage systems. It is shown that method of ultrasonic irradiation is highly effective for modification of carbon-based materials as electrodes in supercapacitors.