by "Berang" (berang)
Published 03/14/2017 at 04:05
by "Berang" (berang)
Published 03/14/2017 at 04:05
Tags: what
STARS: 0
I have one of these old air-driven aquarium filters, but I’m wondering a bit about how the tapering of the intake and exhaust tubes effects the deal.
So at first thought it seems very simple, the air comes down from a pump through a line into the tube on the right, as the diameter of the tube increases the speed of the air should decrease. Then that air spills/bubbles into the tube on the left (which is open on the bottom allowing water in), and as it rises in the tube its speed should increase as the diameter of the tube narrows.
But then I began thinking it about it (dangerous), air bubbles travel faster the larger they get, and unenclosed by a tube a bubble will expand as the pressure of the water decreases in correlation to the decrease in the depth of the water. But these bubbles are in a tube which gets more constrictive as the bubble moves up. So should the bubble exit the tube at speed faster than it entered? Or will the tube slow it down? Or does it make any difference at all?
"Shoop" (shoopdawoop993)
03/14/2017 at 04:48, STARS: 2
Lol idk, To keep the fish from escaping
"Berang" (berang)
03/14/2017 at 04:49, STARS: 1
I’m not sure that’s what filters do.
"4muddyfeet - bare knuckle with an EZ30" (4muddyfeet)
03/14/2017 at 04:56, STARS: 6
"Twingo Tamer - About to descend into project car hell." (oppisitelock)
03/14/2017 at 05:02, STARS: 0
I would imagine there’s enough fluid for them to continue speeding up until they reach the neck. That was the case with our old protein skimmer at least.
"garagemonkee" (monke)
03/14/2017 at 05:41, STARS: 1
I think you’re overthinking it as a quick search shows that most of them just have straight tubes and the conical tubes in your example is probably more due to manufacturing (draft for removing from a mold).
"Berang" (berang)
03/14/2017 at 05:43, STARS: 0
This is probably true, but the straight tube models use an air stone which may also have something to do with it.
"500 Days of Kittens" (500daysofkittens)
03/14/2017 at 05:46, STARS: 0
H2Oh wait what?
" The Compromiser" (charger)
03/14/2017 at 21:13, STARS: 0
Tapered tube for air? Venturi effect. I have no actual idea, but cones and air makes me say venturi. Just because it makes me sound smarter than I am.