We just let normal conduction take its course which as mentioned took about
a half hour as time wasn't a critical factor in our testing. If it were in
a flight scenario I would recommend a circulation pump and heat exchanger.
To elaborate a bit, the test apparatus consisted of a 1" OD by ~12"
long clear polycarbonate tube restrained at both ends with running threaded
rod and aluminum bulkheads. 98% H2O2 was in the bottom half with ~ 1" of
liquid nitrous oxide floated on top. It was this small amount of liquids
that took so long to equilibrate. The apparatus operated at room temp and
at the vapor pressure of N2O or ~900 psig.
Ken
On Thu, Jul 23, 2020 at 2:03 PM <mark.spiegl@xxxxxxxxx> wrote:
ken mason wrote:
[N2O thermal equilibrium]
Very interesting.. you are the first person other than myself to
acknowledge this issue as serious.
I have struggled with N2O temperature striations over and over and over
again. Almost always, my goal is heating the N2O, not cooling it. I have
played with a few possibilities:
-A collapsible rain barrel filled with ice for the supply tank.
-Paint the rocket or static tank black to get help from the sun.
-A magnetic object inside the tank, moved by an external magnet. (like a
chem lab magnetic stirrer on steroids)
-Agitator in the tank... but my machining abilities aren’t good enough for
dynamic seals, etc.
Ken, do you have a practical solution for small amounts of Nitrous?
(20-50lbs)
--MCS