I have seen various tubing sizes tossed around in regard to the recent video demonstration. Does anyone have direct knowledge of the inside diameter of the copper cooling tubing?
Since .5 liters per minute of cooling water flow was demonstrated in the Argon test, let's assume that this flow rate was accurate for the flow rate when the hydrogen was used. It was apparent that the tubing could handle the assumed .5 liters per minute with no problem so the question becomes; what effect does the conversion to vapor have upon that behavior? I noted that the temperature languished at 100 C for a long period of time as the system was coming up to power. This would be consistent with the condition of water passing through that is being vaporized at atmospheric pressure. Initially it would be expected to remain at that temperature and flow rate as long as the vapor is not restricted significantly by the pipe friction losses. This is where we need some knowledge of what should happen at elevated vaporization rates. It should be noted that the net flow rate of cooling water through the device is the same whether or not the water is vaporized by conduction of heat from the device if we assume that the meter at the input reads correctly when reverse pressure is applied. I would like to find a method of estimating the reverse pressure that is expected due to the vapor flow as heat is applied. Does anyone among this group have a good understanding of the pressure drop generated by flowing vapor in a condition such as we are observing? Is there reason to believe that several bars of reverse pressure is present at the output thermocouple at the maximum power point? My main issue is the apparent lack of noise being generated by the vapor exiting the tubing into the sink. This may just be an error in expectation on my part, but perhaps others share that concern. The purpose of this post is to attempt to apply logic to the observations from the demonstration. It would be interesting to squeeze as much information as possible from what was shown. Please offer any evidence or knowledge that you might harbor as we pursue these ideas. Thanks, Dave
