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Some limitations on processing materials in acoustic levitation devicesThe spot heating of samples, suspended in an acoustic field, was investigated to determine if the technique could be used to process materials. A single axis resonance device operating in air at 25 C with an rms pressure maximum of 160 to 170 db was used in the experiments. The heat flow from a hot object suspended in a levitation node is dominated by the effects of the field, with the heat loss approximately 20 times larger than that due to natural convection. The acoustic forces which suspend the body at a node also serve to eject the heated air. The coupling between the locally heated region around the body and the acoustic field results in instabilities in both the pressure wave and force field. The investigations indicated the extreme difficulties in developing a materials processing device based on acoustic/spot heating for use in a terrestrial environment.
Document ID
19810026299
Document Type
Conference Proceedings
Authors
Oran, W. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Witherow, W. K. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Ross, B. B. (NASA Marshall Space Flight Center Huntsville, Ala., United States)
Rush, J. E. (Alabama, University Huntsville, Ala., United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1979
Subject Category
ASTRONAUTICS (GENERAL)
Meeting Information
Ultrasonics Symposium(New Orleans, LA)
Distribution Limits
Public
Copyright
Other