Vol.2, No 4, 2002 pp. 197 - 208
UDC 556.113+556.114

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EXPERIMENT OF WATER AEROSOL ESTIMATIONS OF DROPLET PARAMETERS
Dragan Šarković, Vukota Babović
Department of Physics, Faculty of Science, University of Kragujevac, Serbia

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Abstract. Recently we developed two types of ultrasonic sprayers, one operating in megahertz domain and the other aimed to work in kilohertz domain. This paper is devoted to droplet sizing for aerosols produced by both apparatuses. Two independent methods of physical characterizations are applied, microscopic method and static light scattering method. We conclude that water aerosols generated with a 1.7 MHz piezoelectric plate are rich with droplets of very fine and fine classes (diameters D < 2 ľm). The same is valid for 40 kHz generator, except the relevant groups are those with D < 20 ľm. Because our starting intentions was relating to possible applications of aerosols in tobacco industry and similar branches, these result must be evaluated as sufficiently encouraging. In the paper we present data, figures and tables for water as a working fluid, but a comment is made in order to relate conclusions with expected results for other (low-viscous) liquids. Finally, a short remark is done concerning a simple theoretical model of probability functions for droplet sizing in aerosols.
Key words: Ultrasound, aerosol, droplet.

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EKSPERIMENTI SA VODENIM AEROSOLOM OCENA PARAMETARA KAPLJICA Izradili smo dva tipa ultrazvučnih raspršivača tečnosti, jedan za rad u megahercnom, a drugi za rad u kilohercnom domenu. Ovaj rad je posvećen ocenjivanju veličina kapljica aerosola, proizvedenog obema aparaturama. Dva nezavisna fizička metoda karakterizacije su primenjena: mikroskopski metod i metod rasejanja svetlosti na malim česticama. Mi smo realizovali generator vodenog aerosola sa 1,7 MHz piezoelektričnom pločicom, koji proizvodi kapljice vrlo fine i fine klase, prečnika D < 2 ľm. Od posebne važnosti je 40 kHz generator za grupu kapljica D < 20 ľm, zbog potencijalne mogućnosti njegove primene u duvanskoj industriji i sličnim granama, gde su postignuti početni ohrabrujući rezulati. U ovom radu prikazani su podaci, slike i tabele za vodu kao radni fluid, ali komentar važi i za druge niskoviskozne tečnosti. Na kraju je dato kratko sagledavanje prostog teorijskog modela verovatnoće raspodele veličine kapljica aerosola.