Acoustic streaming generated by ultrasonic transducers, measurements by means of 32 MHz Doppler

• Autorzy: Nowicki A. , Secomski W. , Wójcik J.
• Konferencja: International Symposium on HYDROACOUSTICS AND ULTRASONICS EAA Symposium (formerly 13th FASE Symposium) Gdańsk-Jurata, 12-16 May 1997
• Języki publikacji: EN

Abstrakty

EN

An approximate solution for the streaming velocity generated by flat and weakly focused transducers was derived by directly solving the Dirichlet boundary conditions for the Poisson equation. The theoretical calculations were verified using a purpose-designed 32 MHz pulsed Doppler unit. The applied average acoustic power was changed from l µW to 6 mW. The experiments were done on 4 mm diameter flat and focused transducers. The streaming velocity was measured along the ultrasonic beam from 0 to 20 mm. Streaming was induced in a solution of water and com starch. The experimental results showed that for a given acoustic power the streaming velocity was independent of the starch density in water changed from 0.3 grams to 40 grams of starch in 1 litre of distilled water. For applied acoustic powers, the streaming velocity changed Iinearly from 0.2 to 40 mm/s. Both, the theoretical solutions for pIane and focused waves, and the experimental results were in good agreement.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 1997
• Tom: Vol. 1
• Strony: 337--342
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Nowicki A.

• Department of Ultrasound, Institute of Fundamental TechnologicaJ Research, Polish Academy of Sciences, Swietokrzyska 21, 00-049 Warsaw, Poland

autor

Secomski W.

• Department of Ultrasound, Institute of Fundamental TechnologicaJ Research, Polish Academy of Sciences, Swietokrzyska 21, 00-049 Warsaw, Poland

autor

Wójcik J.

• Department of Ultrasound, Institute of Fundamental TechnologicaJ Research, Polish Academy of Sciences, Swietokrzyska 21, 00-049 Warsaw, Poland

Bibliografia

• 1. Abramowitz M. and L.A. Stegun, (eds.), (1968) Handbook of mathematical functions, Dover Publ, New York,
• 2. Nyborg, W.L, (1953) Acoustic streaming due to attenuating piane waves, J.Acoust. Soc. Am.,25:68-75.
• 3. Nyborg, W. L, (1965) Acoustic streaming, In Mason, W.P., ed., Physical acoustics, IIB, New York: Academic Press, 265-331.
• 4. Starritt HC., Duck F.A., Humphrey V.F., (1989) An experimental investigation of streaming in pulsed diagnostic ultrasound beams, Ultrasound in Med. Biol 15, 4, 363- 373.
• 5. Wu J., Du G., (1993) Acoustic streaming generated by focused gaussian beam and finite amplitude toneburst, Ultrasound in Med. Biol, 19,2: 167-176.