Axil--
Your question:
<<<How can the surface of the reactor sustain a temperature of 1420C if
the nickel particles are cooler that that temperature.>>>
Answer---The energy is generated by the particles is radiant energy and all is
absorbed by the alumina near the inner surface with none being absorbed by the
Ni particles. This seems unlikely to me.
Bob
----- Original Message -----
From: Axil Axil
To: vortex-l
Sent: Saturday, October 18, 2014 11:38 AM
Subject: Re: [Vo]: Gettering in the Lugano IH reactor
This idea contributes the belief that the nickel particles are the source of
heat production. What you are saying is that the particles caused heat to be
generated somewhere else in the reactor, not in or near the nickel particles.
How can the surface of the reactor sustain a temperature of 1420C if the nickel
particles are cooler that that temperature.
On Sat, Oct 18, 2014 at 2:10 PM, Bob Higgins <[email protected]> wrote:
The left side (in Figure 1) 45-50mm of the reactor are much cooler than the
heated core between the insulated supports. This end near the thermocouple
plug probably never exceeded 700C. Particles that ended up there did not
undergo as much sintering. As I recall the Lugano test particle was nearly 500
microns across and probably was that size due to substantial sintering with
smaller particles. Sintering of Ni would still occur in the colder part.
On Sat, Oct 18, 2014 at 11:59 AM, Axil Axil <[email protected]> wrote:
And yet, particle 1 which showed Ni62 transmutation also shower that the
tubercle nano-surface was still in place after days of 1400C operation. Any
ideas?
On Sat, Oct 18, 2014 at 1:13 PM, Bob Higgins <[email protected]>
wrote:
As someone who has first hand experience working with micro-scale
carbonyl Ni powder, and treating these powders in a thermochemical reactor, I
can tell you that what you are saying about the nickel particles is 100% wrong.
Even these 4-10 micron scale nickel particles will sinter into a porous mass
by heating at 500-700C. Ni melts at 1455C and the nano-scale features will all
melt at about half of this temperature - the nanoscale features will ball-up
onto the micro-scale nickel particle to which the feature may be attached. Any
nanopowder of Ni present is melted before 800C and becomes a larger particle -
and then condenses. And Rossi specifically says he does not use nickel
nanopowder anyway. The same is true for other free nanoparticles. By the time
the IH reactor is operating above 1000C, there are no nickel nanoparticles or
nano-features of any kind left - they are all melted into larger agglomerations.
I don't know what your experience is with, but it is not with nickel
powder. Alumina does not store hydrogen in any significant measure.
