Thanks Robin,
That is a good estimate of the melting energy and it demonstrates that a coordinated reaction is required in order to generate one of the crater events. I hope that a chain reaction of this type will always proceed at a slow enough rate to limit the heat released to a safe value. This overall process reminds me of the behavior of a laser medium. It will emit continuous radiation when the pump energy is below a certain value, but a chain reaction begins in earnest once the system gain exceeds a threshold. The activity and density of the NAE sets the effective system gain in the LENR case. Here, the equivalent to lasing is the generation of hot spots and in the spectacular case, a crater. Dave -----Original Message----- From: mixent <[email protected]> To: vortex-l <[email protected]> Sent: Mon, Feb 25, 2013 3:43 pm Subject: Re: [Vo]:Explaining Cold fusion -IV In reply to David Roberson's message of Sun, 24 Feb 2013 17:06:28 -0500 (EST): Hi, [snip] >The big question is whether or not a single fusion event is capable of doing this degree of damage and creating the relatively large heating associated with hot spots. It is well established that temperature does effect the LENR systems in a positive manner. Elevated metal temperature is required to obtain any significant LENR and it is apparent that the higher the temperature of a device such as the ECAT, the more heat is produced. > Assuming a fairly typical crater is a cone with a radius of 1 micron, and a depth of 2 microns, and a face centered cubic lattice (I used Ni), then such a cone would contain about 2E11 Ni atoms. For a metal to melt, the kinetic energy of the atoms needs to exceed the bond energy of the metal, so by calculating the average kinetic energy associated with the melting point of the metal, we can get a rough idea of the energy required to melt the material in the crater. That works out to be 2E11 atoms x 0.233 eV / atom ~= 43000 MeV, or roughly 10 thousand fusion reactions. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
