err..i guess the surface of the cavity is in compression instead of tension. so would the fusion occur there?
Harry Harry Veeder wrote: > > 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-) >>
