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Acoustic Effects in Classical Nucleation TheoryThe effect of sound wave oscillations on the rate of nucleation in a parent phase can be calculated by expanding the free energy of formation of a nucleus of the second phase in powers of the acoustic pressure. Since the period of sound wave oscillation is much shorter than the time scale for nucleation, the acoustic effect can be calculated as a time average of the free energy of formation of the nucleus. The leading non-zero term in the time average of the free energy is proportional to the square of the acoustic pressure. The Young-Laplace equation for the surface tension of the nucleus can be used to link the time average of the square of the pressure in the parent phase to its time average in the nucleus of the second phase. Due to the surface tension, the pressure in the nuclear phase is higher than the pressure in the parent phase. The effect is to lower the free energy of formation of the nucleus and increase the rate of nucleation.
Document ID
20170003412
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Baird, J. K.
(Alabama Univ. Huntsville, AL, United States)
Su, C.-H.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
April 12, 2017
Publication Date
March 13, 2017
Subject Category
Acoustics
Report/Patent Number
M17-5643
Meeting Information
Meeting: American Physical Society (APS) March Meeting 2017
Location: New Orleans, LA
Country: United States
Start Date: March 13, 2017
End Date: March 17, 2017
Sponsors: American Physical Society
Distribution Limits
Public
Copyright
Public Use Permitted.
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