Experiments on the nonlinear interaction of crossed turbulent streaming jets: A case study in mentorship

• Published in: The Journal of the Acoustical Society of America Vol. 152; no. 4; pp. A254 - A255
• Main Authors: Cartron, Jenna M., Korman, Murray S.
• Format: Journal Article
• Language: English
• Published: 01-10-2022
• ISSN: 0001-4966; 1520-8524
• DOI: 10.1121/10.0016190

During (2017–2018) co-author JMC began a mentorship at USNA as a HS senior. Projects led to developing an apparatus to study the interaction between crossed turbulent streaming jets in water. The ISNA 21 (Santa Fe) was an opportunity to present this research – which included a live demonstration. See [Proc. Mtgs. Acoust. 34, 045022 (2018)]. Majoring in material science at JHU, JMC worked as a college intern at USNA (during 4 summers) to further develop the turbulent streaming jets experiment which now included a LaVision 2-D PIV (particle imaging velocimeter). Home-made MOSFET power amplifiers, Langevin 28 kHz ultrasonic transducers and aluminum stepped horns, were replaced by kits developed by Sonics & Materials. The kits including 40-kHz oscillators, 20 Watt amplifiers, impedance matching to the 40 kHz transducers CV245 and titanium 1/2, 1/4 and 1/8 inch diameter stepped horns Part # 630-0594 – to generate stronger downward East and West crossed turbulent jets (at a 60 deg angle) in an open 10 cc acrylic tank. As a by-product, cavitation bubbles allow flow visualization. Lighthill’s nonlinear theory of acoustic streaming (1978) for a single source will be discussed including “Stuart streaming,” Reichardt and Schlicting’s (turbulent jets) and Squire’s theory on nonlinear laminar jet flow.