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Vapor Supersaturation in Collapsing Bubbles. Relevance to the Mechanisms of Sonochemistry and Sonoluminescence

Colussi, A. J. and Hoffmann, M. R. (1999) Vapor Supersaturation in Collapsing Bubbles. Relevance to the Mechanisms of Sonochemistry and Sonoluminescence. Journal of Physical Chemistry A, 103 (51). pp. 11336-11339. ISSN 1089-5639. https://resolver.caltech.edu/CaltechAUTHORS:20150623-154759987

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Abstract

Small amplitude oscillations of gas bubbles in sonicated liquids are quasi-reversible events, but the sudden collapse of widely expanded bubbles results in extensive vapor supersaturation. However, Hilgenfeldt et al. (Nature 1999, 398, 402) explain single-bubble sonoluminescence by assuming that collapsing bubbles revisit their equilibrium radii, R_o, filled with vapor-saturated gas ([gas]/[H_2O] ≈ 31 at 300 K) before becoming impermeable and adiabatic en route to uniform ≥25 kK temperatures. We find that the above assumption is physically untenable and seriously in error. In contrast, we calculate robust [gas]/[H_2O] ≤ 0.12 ratios at R_o by using realistic α_(H_2O) ≤ 0.3 values for the mass accommodation coefficient of H_2O molecules on liquid water at 300 K, and by taking into account the diffusive resistance developing within collapsing bubbles. Therefore, water vapor, rather than any particular gas, is the main component of collapsing bubbles. Its large heat capacity and atomization energies preclude reaching uniform peak temperatures exceeding 5 kK. We briefly analyze the consequences of this analysis and their relation to existing information.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/jp9927202DOIArticle
http://pubs.acs.org/doi/abs/10.1021/jp9927202PublisherArticle
ORCID:
AuthorORCID
Colussi, A. J.0000-0002-3400-4101
Hoffmann, M. R.0000-0001-6495-1946
Additional Information:© 1999 American Chemical Society. Received: August 2, 1999; In Final Form: October 18, 1999.
Issue or Number:51
Record Number:CaltechAUTHORS:20150623-154759987
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150623-154759987
Official Citation:Vapor Supersaturation in Collapsing Bubbles. Relevance to the Mechanisms of Sonochemistry and Sonoluminescence A. J. Colussi and M. R. Hoffmann The Journal of Physical Chemistry A 1999 103 (51), 11336-11339 DOI: 10.1021/jp9927202
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58492
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:28 Jul 2015 19:49
Last Modified:03 Mar 2020 13:01

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