The performance of an acoustic levitator

C. H. Hsu, H. Y. Lin, A. Agarwal, I. Davis, K. P. Nolan, Kim Boon Lua*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


An acoustic levitator uses an array of ultrasonic transducers to generate a standing acoustic pressure field which exerts a radiation force on small particles, allowing the particles to be trapped, relocated, separated or combined. Experiments on levitating particles of different densities and calculations of the acoustic radiation force and moment have been reported in the literature. However, direct inspection on the acoustic pressure field pattern is seldom carried out. This paper reports an investigation on the performance of an existing acoustic levitator design, which uses off-the-shelf components, by comparing the visualized pressure field from Schlieren imaging to analytical simulations. The ability to compare Schlieren imaging results to analytical simulations readily can prove to be a vital tool. Since the simulations provide an ideal pressure field, the imaging of the levitator pressure field can highlight discrepancies between the real and ideal cases. This can be especially useful as a diagnostic tool to identify the cause of a drop in performance of the acoustic levitator in a real world scenario.

Original languageEnglish
Article number012027
Pages (from-to)1-14
Number of pages14
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 28 Aug 2019
Event10th Asian-Pacific Conference on Aerospace Technology and Science, APCATS 2019 and the 4th Asian Joint Symposium on Aerospace Engineering, AJSAE 2019 - Hsin Chu, Taiwan
Duration: 28 Aug 201931 Aug 2019


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