Maximum Water Velocity without Creating Vortex

[iken]

Hi,

I have a "feature pool", which we do not want ripples on the surface of due to water circulation.

Can anyone advise what the maximum water surface velocity should be, to ensure no "ripples" occur. Also, what the maximum water velocity of the suction ports should be, to ensure a vortex is not created (little wirl pools wouldn't go down to good).

Cheers,

 

[Artisi]

Look at the following thread378-255070 - this might give you some idea's.

 

[FredRosse]

The process of a vortex in flow problems is tied to rotational flow. If there is any rotation of the flow, the angular momentum is theoretically preserved, and as the liquid mass travels toward the fluid outlet, the radius decreases, and the rotational speed increases. This is similar to what we see when a spinning ice skater pulls their limbs, they spin faster.

The formation of a vortex is difficult to predict for all but the simplest configurations, as it involves multi-dimensional, rotational flow. The remedy is often found by inserting fluid flow friction that dissipates the rotational tendencies. In a small pool, placing baffles by experiment could be used, or the fliud space could be filled with porous media (say, stainless steel wool) to kill the rotational momentum. If the fill is kept just below the surface, you can approach the "stillness" that you are looking for.