http://www.lanl.gov/science/NSS/issue1_2011/story6full.shtml
500C On Fri, Jun 21, 2013 at 9:15 PM, David Roberson <dlrober...@aol.com> wrote: > That sounds like a good material for Rossi to experiment with for active > cooling. He might be able to reverse the thermal run away process while > operating much closer to the limit of his ECAT thermal capacity. Do you > know the temperature at which that these devices typically operate? > > > Dave > -----Original Message----- > From: Axil Axil <janap...@gmail.com> > To: vortex-l <vortex-l@eskimo.com> > Sent: Fri, Jun 21, 2013 9:03 pm > Subject: Re: [Vo]:Passive High Temperature Convective Thermal Control > > *A *lithium heat pipe provides enough thermal capacity and power > transfer density than you could ever want or need. Gravity is not a factor. > > The heat transfer can be controlled by a temperature regulation of the > liquid lithium return flow. More flow results in more cooling through heat > transfer through phase change from liquid to vapor. This phase change > mechanism is 1000 more powerful than convection cooling. ** > * * > * * > > > On Fri, Jun 21, 2013 at 8:42 PM, James Bowery <jabow...@gmail.com> wrote: > >> Systems like the LFTR have passive high temperature thermal control based >> on thermal expansion of a near-critical mass density. As the temperature >> increases, thermal expansion produces a rapid drop in power production >> thereby stabilizing the reactor core. >> >> Systems like the E-Cat HT are solid state and, in any event, are not >> dependent on critical mass density, but another approach to utilization of >> thermal expansion might work: >> >> Thermal Convection >> >> To make thermal convection work, passive (free) convective forces must >> be large enough to move enough thermal capacity past the power source and >> must be in a regime where the rate of cooling exceeds the power production >> at the target temperature. >> >> The 3 variables one has to play with to reach the target temperature >> are material thermal properties, power density of the E-Cat and g forces. >> Of these three, only g forces and power density are amenable to continuous >> alteration via centrifugation and reactor fabrication respectively. >> >> In my ultracentrifugal rocket engine patent, the g-forces are so >> enormous that enormous fluid flow, hence enormous thermal capacity flow >> enables relatively small heat exchange surfaces to cool the engine. A >> material that might be worthwhile analyzing in this regard is NaCl (sodium >> chloride) with a melting point near the high end of the E-Cat HT, and a >> heat capacity comparable to that of H2O. It is problematic to run molten >> NaCl in an ultracentrifuge due to material strength limits as they detemper >> at high temperature. >> >> On the other hand, power density might be reduced to the point that the >> heat capacity flow rate, even under only 1-g, might be sufficient. >> >> Clearly some arithmetic needs to be done here. >> > >
