( I'm sure Add'y will explain) It seems that you would have all kinds of juice in top of the carto but you don't? I did have a problem with new cart the silicone trap was sitting on the fill easily fixed it got a little messy.
I do have a hypothesis that works to address all those concerns - since I was "invoked" and all.
My hypothesis:
You don't have juice at the top nor in the air passage because it doesn't adhere strongly enough to overcome the force of the vacuum being generated. When you draw the condom back off you draw off the juice that was in the air passage and free area of the carto with the vacuum generated. The vacuum is not enough to overcome the attraction of the batting.
Take a bunch of dirt and drop it on the tile. The vacuum picks it up for several inches away - there's nothing adhering it or attracting it outside of friction which is very small at that fine a scale. Now do the same thing on the carpet. Notice that the dirt deep in the fibers is very difficult to release. Even harder with a liquid that has been absorbed into the fibers which have a tremendous amount of surface area.
When you apply force on the mouth piece side you push the silicon o-ring down against the batting. When you draw back, you pull it back to exactly the position it was originally. The amount of air being displaced remains constant. That, however, assumes a perfect seal and perfect location of force applied. Assuming the you pressed to one side or another, the opposite side may depress more or less, causing the o-ring to suffer more or less friction or lose more or less vacuum, and it may then release the air bubble. So when you draw back it may move less or not at all.
The risk with filling to the battery-side is that the oring will be pushed out and then potentially drawn tight against the batting if you lose proper seal.
.
Without a
Taryn Centrifuge being employed I suspect you won't ever get a full fill. The pressure can't be applied slowly enough, and the upper layers will become saturated and push the liquid back in towards the center, while the lower layers remain dry. You could, perhaps, fill that way partially, release, put a condom on the bottom, then plug the top hole and use vacuum pressure to draw filling into the lower layers. That would function in the same principle as the
Taryn Spin.
In fact, I think giving this just some cursory thought that we can even calculate this. I believe we are observing Bernoulli's Principle at play here. That being the case, going very slowly will be key to getting the best possible results. For those that aren't physics-of-fluid-dynamics fans, Bernoulli states, simply, that if we increase the speed of the fluid flow, the potential energy of the fluid will decrease -
for an inviscid fluid. Now this is an exceptionally viscid fluid we're dealing with here, but the problem should still be capable of being modeled in its simple form using the Euler equations and simplifying with the Reynolds number. There is some substantial compressibility here, so we need to turn to Navier-Stokes...
Errr - sorry forgot for a moment there what forum I'm on. I'll save this one for another forum.
