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- From: crb7q@kelvin.seas.Virginia.EDU (Cameron Randale Bass)
- Subject: Re: Sonoluminescence - certain knowledge?
- Message-ID: <1993Jan7.164414.17497@murdoch.acc.Virginia.EDU>
- Sender: usenet@murdoch.acc.Virginia.EDU
- Organization: University of Virginia
- References: <00966330.AB98DB60.10309@dancer.nscl.msu.edu> <1993Jan6.191134.19959@murdoch.acc.Virginia.EDU> <1993Jan7.073202.22731@coplex.com>
- Date: Thu, 7 Jan 1993 16:44:14 GMT
- Lines: 58
-
- In article <1993Jan7.073202.22731@coplex.com> chuck@coplex.com (Chuck Sites) writes:
- >crb7q@kelvin.seas.Virginia.EDU (Cameron Randale Bass) writes:
- >
- >>In article <00966330.AB98DB60.10309@dancer.nscl.msu.edu> blue@nscl01.nscl.msu.edu writes:
- >>>Could someone set my mind at ease by making a clear statement as to
- >>>what is know about sonoluminescence, ultracavitation, and related
- >>>topics as opposed to conjecture based on doubtful interpretations of
- >>>a very limited data set?
- >
- >> The dataset is not as limited as it sounds, and the recent results
- >> are a) consistent with earlier results, b) plausable on theoretical
- >> grounds, and c) apparently well done.
- >
- >>>My understanding of cavitation and bubble formation is that it can
- >>>involve a very small move away from equilibrium conditions. All that
- >>>is required is that the local pressure in the liquid fall below the
- >>>vapour pressure. I would assume that the bubble fills with vapour
- >>>on a time scale close to that required for collapse so I don't
- >>>understand why there is any talk about collapse into a "void".
- >
- >> Yes. Void is used by fluid dynamicists to talk about a
- >> space filled with vapour. We shouldn't be talking about a vacuum.
- >
- > Some food for thought. What we seem to be discussing is how the
- >energy of cavitation can lead to fusion. IMHO, it's an excellent
- >question, so let me give you my simple thought model of how it works.
- >Get a balloon, and put some dots on it. The dots represent molecules
- >of the liquid at the void/liquid interface. As you blow the balloon
- >up (representing the expansion of the void), add more dots to maintain
- >an equal spacing of dots. As you draw lines between the dots (representing
- >bonding) you can see this should collect a large number of electrons at the
- >surface interface (many weakly bonded). The vapor molecules are self-
- >contained. The collapse of the balloon, must then either push the additional
- >dots back to it source, or be pushed into the void area. Either way a
- >significant number of bonds are broken at the surface, and that suggests
- >the emission of quanta.
-
- Actually, it suggests that the molecules move around and
- the pressure changes. Equal spacing is not maintained
- in most fluids.
-
- > Still the the release of electrons during the void collapse should
- >concentrate at the center of the void. If we assume the void is a fusible
- >vapor, two actions occur. Kinetic energy is transferred from the
- >collapsing surface to the center by EM forces of the lattice, and
- >free electron densities increase at the center. It follows from
- >the work of S. Koonin, that these combinations are optimal enhanced
- >fusion rates.
-
- There are good electromagnetic reasons to suggest that any
- ionization does *not* concentrate electrons in the center of
- an ordinary vapor bubble. To which work of Koonin's are you referring?
-
- dale bass
- --
- C. R. Bass crb7q@virginia.edu
- Department of Wildebeest
- Transvaal (804) 924-7926
-