/diy/ - Do It Yourself

>>2705257
it'd help if you spent even 3 seconds using google and learning you lazy zoomer

How small is the tube, could you tun another tube up inside it as a breather line with a valve on it?

>>2705257
Right pic is women when I walk by

>>2705271
Left is when op walks by
>no verification

>>2705262
It's about 5mm in diameter. It's the water outlet in this picture, after the water of the lower jar has been partially depleted.

The lower jar contains a very weak pump that drains the water. The upper part acts like a water reservoir

>>2705273
forgot picture

>>2705275
having two tubes like this doesn't work either

>>2705262
forgot to mention that i want the system completely passive without any interactions needed. I would pick a larger tube if it was possible but that's not an option

>>2705257
Alter surface tension by quickly spinning tube?

>>2705277
https://www.youtube.com/watch?v=3hiElajSgvo
??

>>2705278
Can you alter the lower jar?It would take some figuring but if you could make it much taller and narrower and had the tube letting out right at the bottom you might be able to create enough pressure to stop the water flowing down until the water level dropped

>>2705283
Yes I'm trying to build something like that at a rather small scale

>>2705284
can't lower the jar

Glue a thin, stiff rod or wire to the inside of the tube running vertically and extending past the tube opening, this will break the surface tension that's preventing the water from running out and cause the water to flow down the rod/wire.

>>2705291
Can you just miniaturize what he did there?

>>2705257
>left
turn it upside down
>right
turn it the other way

>>2705257
Put tiny tube in a vaccum chamber upside down and watch it drain.
Alternatively, can you boil off the water?

>>2705257
Put a string of yarn in the tube and leading out, it will empty it

>>2705422
nope can not boil

>>2705478
>>2705299
these two have someting in common and seem interesting

>>2705299
how can a rod break the tension? Do you have any reference on that principle?

>>2705664
>how can a rod break the tension?

Surface tension at the end of a round tube is equally distributed along the edges of the tube, the rod extends that edge surface in a way that imbalances the tension and breaks it the same way a soap bubble is weakened by contact with pointy objects.

>Do you have any reference on that principle?

Yeah, get your tube full to where it's not draining and place a rod in the end as described.

You could also do the reverse and fill a vessel with a round rim like a drinking glass so full that water rises above the rim but is held in a shallow elliptical shape (meniscus) by surface tension...

Then touch a rod to the edge of the rim so that it contacts the water and see what happens. You can do the same experiment with a bead of water on a flat surface, lay a needle or wire on the surface so that it touches the bead surface at the interface with the surface and watch it wick away as the tension balance collapses.

https://en.m.wikipedia.org/wiki/Meniscus_(liquid)

https://en.m.wikipedia.org/wiki/Capillary_action

>>2705257
You can coat the inner walls of the tube to become superhydrophobic (I.e. contact angle >90) that way the capillary pressure becomes negative and water will be pushed out when the tube is inverted. Depending on the material of the tube, there are usually all sorts of ‘nanocoatings’ being sold that can be applied as a solution.

>>2705257
Consider that it's atmospheric pressure and surface tension holding the water up.
so, either increase the pressure inside the tube or decrease the pressure outside the tube.

>>2705673

I tried your rod suggestion. The water was not impressed. No matter if i put the rod near the wall or into the centre, the water stays in the tube.

But "extends the edge surface" gave me another idea. I cut an angle into the tube and the air started moving up the tube. My tube is made of silicone and has an inner diameter of 6mm. I tried the same approach with a 4mm inner diameter tube and it did not work.

Moments before i tried poking a hole into the side of the tube near the lower end in hope that that would for whatever reason do the trick. It did not

>>2705257
solution in the picture

Can you whack it real hard from the outside?

>>2705257
maybe if you increase the density of the water it will overcome the thin pipe surface tension
try chilling it to near 0c

im glad im not the only highschool dropout here lol

Am I missing something or is OP just a retard? Look up automatic water dispensers, primarily for small livestock like chickens