Yes Bob, Thanks. The effect due to thermal expansion has been evaluated by Alan Goldwater to be a fraction of a percent. This pales in comparison to the ~40% effect of the 2-volume 2-temperature calculation, the ~12% effect of van der Walls vs. ideal gas, and the uncertainties in the actual mass of LiAlH4. But, it should be a part of the calculation.
Another effect that could be at least as large is the mechanical expansion of the alumina tube under the forces of the high pressure. Thermal expansion increases the size of both the displacement rod and the tube, but mechanical strain would only increase the tube diameter, causing a bigger change in the dead volume. Bob Higgins On Fri, Feb 20, 2015 at 9:10 AM, Bob Cook <[email protected]> wrote: > Bob and Mark-- > > One potential minor correction to the volume should account for the > increase (or decrease)in volume with temperature due to thermal expansion > of the alumina tube and the added materials inside the tube. > > Bob > > ----- Original Message ----- > *From:* Bob Higgins <[email protected]> > *To:* [email protected] > *Sent:* Thursday, February 19, 2015 2:08 PM > *Subject:* Re: [Vo]:Explosion May Be Out of Control LENR > > Mark, > > Alan Goldwater is working on a complete description of this that is being > reviewed. One thing I recently added was the 2-volume, 2-temperature > calculation, which, even with the ideal gas formula cuts the theoretical > pressure to about 60%. I think Alan may be planning to discuss with you > the 2-volume, 2-temperature calculation extended with the van der Walls > formulation. So, Alan created a document walking through the volumes and > mass calculations for the fuel and it is being reviewed at this time - it > still is not ready with all of the effects. However, there is no reason > not to give you what he is starting with to see if you come up with the > same pressure estimates. The primary heated volume having the fuel was > calculated to be 0.844ml, and the cooler dead volume was 0.611ml. The best > estimates of the fuel (by Alan) was 0.565g of Vale T255 Ni + 0.105g of > LiAlH4. The initial fuel volume displacement estimate was 0.177ml which > reduces the internal volume of the heated area. > > The alumina tube ID was 3.81mm, and the OD of the rod taking up the dead > space was 3.17mm. The OD was slightly under 6.35mm (1/4"), leaving a wall > thickness of about 1.25mm. The sintered Ni rod that remained was about > 3.15mm diameter. The Li-Al film on the ID of the tube is estimated to be > 25-100 microns in thickness. Aside from the dimensions, there is no way to > estimate the proximity of the OD of the sintered Ni and the ID of the > alumina. > > Bob > > >
