(sorry if you are getting this twice) Nice analysis.
If the cavity is at a lower pressure than the surrounding fluid, does the surface tension of the fluid act like the hull of submarine? Harry Grimer wrote: > In the light of the parallel between the > "Tiny Bubbles in the Sky . . ." and the truly tiny > bubbles in sonoluminescence I thought I'd revisit > my files and find how the insights gained from those > space "Bubbles" might increase understanding of the > connection between the two. > > The most significant recent work is, of course, that > by Taleyarkhan. As might be expected, his claim of > fusion has caused a similar furore as that of F&P. > > The distinctive feature of Taleyarkhan's experiments > was the use of neutrons to seed the bubbles rather > than relying on: > > "small air bubbles already in the liquid. Using this > new method, the team was able to produce stable > bubbles that could expand to nearly a millimeter in > radius before collapsing. In this way, the researchers > stated, they were able to create the conditions > necessary to produce very high pressures and > temperatures." > > Now it is significant that the high temperatures > claimed (10 megakelvins) and the relatively huge > expansion are the same as that claimed for the > "Tiny Bubbles in the Sky . . .". This suggests > that from a General Systems viewpoint we are > dealing with the same phenomena, a highly rarified > gas in an intense Beta-atmosphere vacuum. > > I believe that the mistake Taleyarkhan and others > are making is to focus their attention on the > collapse of the bubble. In the first place we are > not dealing with bubbles but with their inverse, > with not-bubbles. In other words we are dealing > with cavities. > > Bubbles are at a higher internal pressure than > the surrounding environment. Cavities are at a > lower internal pressure. Therefore, though > "Tiny cavities in the sky...." may be less poetic > than "Tiny bubbles..." being more suggestive of > rotten teeth than a mountain spring, it would > be a more accurate title for this thread. > The bubbles in the sky aren't bursting but > collapsing. > > The temperature increase in Taleyarkhan's > cavities must take place as the cavity expands > and the temperature of the low pressure gas > inside the cavity increases to that of the sun's > interior. Any action that takes place must occur > when the cavity is large. As the cavity > decreases in size the temperature of the > rarified gas within will drop. > > The same conditions must apply in the case of > cold fusion. The temperature of the rarified > gas within expanding cavities will increase > to levels sufficient for fusion to take place. > > What causes the expansion of the cavities in > palladium. Who knows? Redistribution of the > stresses inbuilt during manufacture perhaps > giving rise to increase in compressive strains > in some places and increase in tensile strains > in other. > > I suppose a more likely cause is the > differential tensile strains that arise from > the pressure of deuterium nuclei as they > saturate the metal. > > Perhaps a more accurate name for Cold Fusion > would be Cavitation Fusion, cos, clearly, > that's what it is. 8-) > > Cheers, > > Frank Grimer > > The high temperature inside metal cavities > also explains what the researches detected > inside the cup and cone cavity that forms > just prior to failure in steel. It's a > pity I never been able to find that reference > again. No doubt someone will turn it up one > of these days. 8-) > > > > > > > > > > > > > > > > > > > > > > > >
