Ryan Hunt would better to ask this question. I believe the reactor tube in the Bang! experiment was from CoorsTek. The other dogbone alumina tubes were also from CoorsTek. They have an online store.
It is the dogbone Lugano HotCat replica that has the heater coil wrapped around a second alumina "heater" tube and then overmolded with the finned convection surface. The design called for a heater tube ID of 7.95mm and a reactor tube OD of 6.35mm. I don't know what the actual tube measurements were. However, the Bang! experiment did not use the dogbone as the tube furnace for the experiment. Bob Greenyer had gotten some sample SiC tube heaters that could go to very high temperature. They tried molding one into a dogbone, but it was too fragile and just shattered during the molding process. The closed-one-end reactor tube was slipped into the SiC tube heater with no convection surface other than the bare SiC heater tube. I don't know what the clearance was for the SiC heater tube, but it was probably about 4-5mm in diameter. The SiC heater could go easily to 1500C, so there was no problem in getting the reactor tube as hot as they wanted. It would have been difficult to measure a real COP for that experiment. The thermocouple was attached to the reactor tube and it was also measured using the Williamson pyrometer. When the alumina tube exploded in the Bang! experiment, it completely shattered the SiC heater tube around it and that was the last sample. Future experiments will likely be in the dogbone. On Wed, Mar 4, 2015 at 8:16 AM, Mark Jurich <jur...@hotmail.com> wrote: > Bob, what was the Free Tolerance between the Reaction Tube OD > and the Heater Tube ID in the MFMP Bang! Experiment? > > Who was the manufacturer of the alumina tubes? > > Thanks, > Mark Jurich > >
