Cichlids_au Posted June 10, 2004 Share Posted June 10, 2004 I'm not sure Luke. I'll get my calculator out and see if I can work it out for you Link to comment Share on other sites More sharing options...
Luke Posted June 10, 2004 Share Posted June 10, 2004 Link to comment Share on other sites More sharing options...
Gigitt Posted June 12, 2004 Share Posted June 12, 2004 My Turn! I think I have solved the mystery! The problem of water flow is not hose diameter or length! The problem of water flow is related to hose length but length is not the cause. The cause is distance you are from the tank. Yep! You see.. Fish are curios things... every time I'm syphoning water I have to keep my fish away from the inlet hose in the tank! Your problem of lower flow rate with a much longer hose might be that because you are too far from your tank (distance) you CANNOT see you poor fish getting stuck in the inlet of the syphon... all you are worried about it WHY I have poor flow... Personally I think you take a head count of fish before and after syphoning. Also look out for a fish with a BIG hickie the diameter of the hose! hehe Link to comment Share on other sites More sharing options...
dean1987 Posted June 12, 2004 Share Posted June 12, 2004 im no water scientist guy or anything but.... although this was mentioned before just use a thicker hose and make it as short as possable. cheers Dean Link to comment Share on other sites More sharing options...
anchar Posted June 12, 2004 Share Posted June 12, 2004 LOL Gigitt, not too sure about the hickies....but goldfish come out in pieces (only restricts the flow for a few seconds ). Ever wondered how they make Telescope and other boggly-eyed goldies???? merjo Link to comment Share on other sites More sharing options...
TSMill Posted June 15, 2004 Share Posted June 15, 2004 cihlids_au is on the money with the Darcy equation. Now to modify it a bit and put some numbers in there. Assuming laminar flow: Looks tricky so far, but to get a ratio between velocity 1 (where h=1.2m and L=1.2m) and velocity 2 (h=4m and L=15m), like terms (diameter, denisty and viscosity) cancel out to give: Now if both were turbulent, friction factors would be about the same in each case, and the ratio between the 2 velocities would be closer to the square of the above, or around 1.9 times more water flow in the shorter pipe. OK, think I have geeked up this thread sufficiently..... Link to comment Share on other sites More sharing options...
Gigitt Posted June 15, 2004 Share Posted June 15, 2004 maths = headache Link to comment Share on other sites More sharing options...
Fixem Posted June 15, 2004 Share Posted June 15, 2004 Fish keeping aint "rocket science" otherwise most of us could be counted out! But hey, 3 pages of this is pretty good going isn't it? Link to comment Share on other sites More sharing options...
anchar Posted June 15, 2004 Share Posted June 15, 2004 Ok lets chuck in another variable....what about if there is water already lying in the hose, before you start to siphon ....therefore having a break in the water column.............now we are looking at PE and KE merjo Link to comment Share on other sites More sharing options...
TSMill Posted June 15, 2004 Share Posted June 15, 2004 Nah, wont make a difference other than the potential for a mouthfull of tank water! Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.