Reproducing the "rapid phase change" phenomenon with the sides of the tuna can used to support the aquarium gravel cut away for a better view..
Now I think it can be. very clearly seen that the effect is due to the rapid formation, expansion, contraction and disappearance of water vapor bubbles.
The engine, however is apparently NOT able to reach operating temperature in this condition, or possibly the presence of so much liquid water in the phase-change medium has an inhibiting effect on the running of the engine in some way, as yet unknown.
My suspicion is that for the engine to run, at least some of the water vapor needs to be in a superheated condition. For that, the engine needs to be operated on the dry side so that the bottom of the engine can reach a temperature higher than the normal boiling point of the liquid.
Unfortunately, the epoxy that was holding the top of this engine together did not hold, coming loose after the conclusion of this video, so testing with this engine was cut short and it will need to be rebuilt, again before further testing can take place.
Негізгі бет Better view of the rapid phase change in "wet thermoacoustic" Stirling engine.
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