Journal ArticleDOI
Compact acoustic levitation device for studies in fluid dynamics and material science in the laboratory and microgravity
Reads0
Chats0
TLDR
In this article, an ultrasonic levitation device is described together with its various applications in the fields of fluid dynamics, material science, and light scattering, including surface waves on freely suspended liquids, the variations of the surface tension with temperature and contamination, the deep undercooling of materials with the temperature variations of their density and viscosity.Abstract:
An ultrasonic levitation device operable in both ordinary ground-based as well as in potential space-borne laboratories is described together with its various applications in the fields of fluid dynamics, material science, and light scattering. Some of the phenomena which can be studied by this instrument include surface waves on freely suspended liquids, the variations of the surface tension with temperature and contamination, the deep undercooling of materials with the temperature variations of their density and viscosity, and finally some of the optical diffraction properties of transparent substances.read more
Citations
More filters
Journal ArticleDOI
Levitation in Physics
TL;DR: Levitation is used for containerless processing and investigation of materials, for frictionless bearings and high-speed ground transportation, for spectroscopy of single atoms and microparticles, and for demonstrating superconductivity in the new oxide superconductors.
Journal ArticleDOI
Containerless processing in the study of metallic melts and their solidification
TL;DR: The study of metallic melts, their physical properties, and their solidification behavior is of relevance to understanding of fundamental principles and to metallurgical applications as discussed by the authors, and many, if not all, of them have been studied.
Journal ArticleDOI
Observation of a Single-Beam Gradient Force Acoustical Trap for Elastic Particles: Acoustical Tweezers.
TL;DR: The trapping of elastic particles by the large gradient force of a single acoustical beam in three dimensions is demonstrated, demonstrating the large spectrum of frequencies covered by coherent ultrasonic sources and could open the way to important applications in biology and biophysics at the cellular scale and for the design of acoustic machines in microfluidic environments.
Journal ArticleDOI
Acoustic physics. Suspended by sound.
TL;DR: Ultrasound waves can levitate heavy balls of tungsten and this contact-free method of keeping items suspended in the air can be applied to the investigation and processing of new materials.
Journal ArticleDOI
TinyLev: A multi-emitter single-axis acoustic levitator
TL;DR: A single-axis levitator based on multiple, low-voltage (ca. 20 V), well-matched, and commercially available ultrasonic transducers is designed and evaluated and Levitation of water, fused-silica spheres, small insects, and electronic components is demonstrated.
References
More filters
Journal ArticleDOI
On the Acoustic Radiation Pressure on Spheres
TL;DR: In this paper, it has been shown that at supersonic frequencies the acoustic radiation pressures on spheres and discs become sufficiently large to be measured easily, at any rate, in liquids.
Journal ArticleDOI
Acoustic radiation pressure produced by a beam of sound
Boa‐Teh Chu,Robert E. Apfel +1 more
TL;DR: In this paper, the second-order force produced by a sound beam directed normally at a plane target is calculated and a number of general relations are established using a new approach which avoids the necessity of dealing with detailed solutions of the governing nonlinear equations.
Journal ArticleDOI
Free oscillations of drops and bubbles: the initial-value problem
TL;DR: In this paper, the authors study the initial value problem posed by the small amplitude free oscillations of free drops, gas bubbles, and drops in a host liquid when viscous effects cannot be neglected.
Journal ArticleDOI
Large-amplitude free and driven drop-shape oscillations - Experimental observations
E. H. Trinh,T. G. Wang +1 more
TL;DR: In this article, a quantitative study of drop-shape oscillations in a liquid-liquid system has been completed, and the results suggest a soft nonlinearity in the fundamental resonant mode frequency as the oscillation amplitude is increased.
Journal ArticleDOI
Clustering in supercooled water
TL;DR: In this article, the specific heat and densities of supercooled water and heavy water were measured from their respective melting points to their respective homogeneous nucleation temperatures, and the results were interpreted in terms of Frenkel's heterophase fluctuation theory.