Register to reply

Water Does Not Leak Back To The Other Side.

by Dug Fmjamul
Tags: leak, water
Share this thread:
Dug Fmjamul
#1
May23-13, 01:11 PM
P: 4
I sealed with silicone and partitioned a 10 Gallon Aquarium with an 8 inch by 8 inch double glass plate with about 3 gallons on one side and 7 gallons on the other. The 3 gallon side was to be dry and filled with gravel and rocks, while the 7 gallon side would have a thin bottom layer of gravel and filled with water. After some time the water links over to the 3 gallon side until it is level with the water on the 7 gallon side. But when I drain the 7 gallon side of water the 3 gallon side does not leak over to the 7 gallon side and the water level does not drop.

Any clues as to the 'why'? Because I don't have any and I'm baffled why the water doesn't leak back over to the 7 gallon side.
Phys.Org News Partner Engineering news on Phys.org
New filter technology uses inert gas to bore holes in high-quality steel
Augmented reality helps in industrial troubleshooting
How wireless technology can dramatically improve ship safety
Travis_King
#2
May23-13, 03:48 PM
P: 841
You didn't seal it properly
davenn
#3
May23-13, 03:58 PM
Sci Advisor
PF Gold
davenn's Avatar
P: 2,646
and the poor seal you did do is acting like a valve

Dave

berkeman
#4
May23-13, 04:04 PM
Mentor
berkeman's Avatar
P: 41,084
Water Does Not Leak Back To The Other Side.

Quote Quote by Dug Fmjamul View Post
I sealed with silicone and partitioned a 10 Gallon Aquarium with an 8 inch by 8 inch double glass plate with about 3 gallons on one side and 7 gallons on the other. The 3 gallon side was to be dry and filled with gravel and rocks, while the 7 gallon side would have a thin bottom layer of gravel and filled with water. After some time the water links over to the 3 gallon side until it is level with the water on the 7 gallon side. But when I drain the 7 gallon side of water the 3 gallon side does not leak over to the 7 gallon side and the water level does not drop.

Any clues as to the 'why'? Because I don't have any and I'm baffled why the water doesn't leak back over to the 7 gallon side.
Welcome to the PF. Can you upload a picture of the setup? How did you brace the partition?
BobG
#5
May23-13, 04:29 PM
Sci Advisor
HW Helper
BobG's Avatar
P: 2,280
To expand on previous posts, the water pressure is higher on the 7 gallon side than the 3 gallon side. Your seal may be good enough to handle the pressure on the 3 gallon side, but not good enough to handle the pressure on the 7 gallon side.

That said, I'm surprised the water would continue to leak until both sides were level.

Once initially broken in the direction from the 7 gallon side to the 3 gallon side, they fail to close up again as long as there is any water between the seal and the wall?

While in the opposite scenario, water on the 3 gallon side and none on the 7 gallon side, the pressure from the 3 gallon side acts to close the seals that were initially broken?
Dug Fmjamul
#6
May23-13, 05:40 PM
P: 4
Quote Quote by Travis_King View Post
You didn't seal it properly
I know that.
Dug Fmjamul
#7
May23-13, 05:43 PM
P: 4
Quote Quote by davenn View Post
and the poor seal you did do is acting like a valve

Dave
That makes sense, but a one-way valve?
Dug Fmjamul
#8
May23-13, 05:47 PM
P: 4
Quote Quote by BobG View Post
To expand on previous posts, the water pressure is higher on the 7 gallon side than the 3 gallon side. Your seal may be good enough to handle the pressure on the 3 gallon side, but not good enough to handle the pressure on the 7 gallon side.

That said, I'm surprised the water would continue to leak until both sides were level.

Once initially broken in the direction from the 7 gallon side to the 3 gallon side, they fail to close up again as long as there is any water between the seal and the wall?

While in the opposite scenario, water on the 3 gallon side and none on the 7 gallon side, the pressure from the 3 gallon side acts to close the seals that were initially broken?
Thanks, that sounds plausible. But if I gradually add water to the 7 gallon side would there be a point where the 3 Gallon side would start to release water to the 7 gallon side? I'm going to try that and see what happens.
physwizard
#9
May23-13, 06:21 PM
P: 153
It is possible that there may be some small stones or obstacles near where the leak happens but only on one side. So this would allow allow water to flow more easily from one side to the other.
I don't really support the caging of fish or animals/birds. They have the same right to freedom as we do.
256bits
#10
May24-13, 02:02 AM
P: 1,481
Quote Quote by Dug Fmjamul View Post
That makes sense, but a one-way valve?
Similar to the valves in your heart.
Or the PCV in your car, a foot valve at the bottom of the pipe in a well, ....
Averagesupernova
#11
May24-13, 06:10 PM
P: 2,528
Quote Quote by BobG View Post
To expand on previous posts, the water pressure is higher on the 7 gallon side than the 3 gallon side. Your seal may be good enough to handle the pressure on the 3 gallon side, but not good enough to handle the pressure on the 7 gallon side.
How do you figure there is a pressure difference from one side to the other?
BobG
#12
May24-13, 06:22 PM
Sci Advisor
HW Helper
BobG's Avatar
P: 2,280
Because one side is empty and the other is full?

Or are you asking why 7 gallons of water exerts more pressure on the divider than 3 gallons will when one side is full and the other is empty?

As straight forward as the question should seem to be, I'm pretty sure I don't really understand what you're asking.
russ_watters
#13
May24-13, 07:23 PM
Mentor
P: 22,297
Bob, you aren't suggesting volume has anything to do with pressure, are you? The only thing that matters is the height of the water. (I got the same impression from reading your first post as well.)
Averagesupernova
#14
May25-13, 03:07 PM
P: 2,528
Quote Quote by russ_watters View Post
Bob, you aren't suggesting volume has anything to do with pressure, are you? The only thing that matters is the height of the water. (I got the same impression from reading your first post as well.)
Yes russ, I read that post the same way you do.
256bits
#15
May26-13, 10:15 AM
P: 1,481
While in the opposite scenario, water on the 3 gallon side and none on the 7 gallon side, the pressure from the 3 gallon side acts to close the seals that were initially broken?
Because one side is empty and the other is full?

Or are you asking why 7 gallons of water exerts more pressure on the divider than 3 gallons will when one side is full and the other is empty?
i think it can be assumed that with one side full and the other empty the full side exerts more pressure than the empty side.

after all the questioner does state
After some time the water links over to the 3 gallon side until it is level with the water on the 7 gallon side. But when I drain the 7 gallon side of water the 3 gallon side does not leak over to the 7 gallon side and the water level does not drop.
Since after the water equalizes in height of both sides, there had to be more pressure on the 7 gallon side than the 3 gallon side.
i don't see any reference to pressure being a result of volume.
Averagesupernova
#16
May26-13, 11:24 AM
P: 2,528
Quote Quote by 256bits View Post
i think it can be assumed that with one side full and the other empty the full side exerts more pressure than the empty side.

after all the questioner does state

Since after the water equalizes in height of both sides, there had to be more pressure on the 7 gallon side than the 3 gallon side.
i don't see any reference to pressure being a result of volume.
I DO see a reference to it and I want to know if I am missing something because I think it is pretty common knowledge that the height of the water is what determines the pressure. Obviously the 7 gallon side will have more pressure than the 3 gallon side when the 3 gallon side is lower than the 7 gallon side. But it seemed to me that it was implied that the 3 gallon side does not develop the same pressure in reverse when the 7 gallon side is lower than the 3 gallon side.
-
This is the statement in question:
To expand on previous posts, the water pressure is higher on the 7 gallon side than the 3 gallon side. Your seal may be good enough to handle the pressure on the 3 gallon side, but not good enough to handle the pressure on the 7 gallon side.
-
So what is it? Did I miss something?
256bits
#17
May26-13, 04:47 PM
P: 1,481
the 7 gallons side leaks to the 3 gallon side ( originally empty) until both are of the same height. Then the 7 gallon side is drained and water does not leak from the 3 gallon side to the 7 gallon side. The original height h of the 7 gallon side would have to have been greater than the starting h of the 3 gallon side. That is how I interpreted the original scenario and carried that along from post to post.

It is cumbersome to be calling the containers the 7 gallon side and 3 gallon side.

I am not saying my interpretation is any more correct than yours - just that I did not notice any problem with the statments. You and Russ did. Now I tend to wonder by polling readers what the percentage of readers would see it either way. I cringe at the possibility of being a lonely minority of 1.

Other than Bob coming in with his explanation.
Averagesupernova
#18
May26-13, 06:03 PM
P: 2,528
Ok 256. I was just wondering if I misunderstood the setup. Yes it is a cumbersome description.


Register to reply

Related Discussions
Water Leak Problem General Engineering 4
How to stop leak of water tank while steel rod enters and exits? Engineering Systems & Design 1
Leak correlation between water and air General Engineering 0
Fluid Mechanics: Water leak in a water tower Introductory Physics Homework 1
Locating a leak in high pressure water plastic plumbing General Discussion 20