Quote:
Originally posted by bigben2k
My pump is fairly powerfull: Little Giant 2-MDQ-SC (see PQ curve below). Max flow around 525 gph, max head 14.6 feet.
What I meant about the flow being at 1mm is just that: if you look at the first graph I posted (from Roscal's analysis), it shows that out of all the channels, most of the flow is concentrated at the bottom 1mm: the rest is almost stagnant. I'm kinda hoping that the new inlet geometry will kinda help this too.
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That's one nice pump. I seen one at Ace yesterday and debated to get it or not.
I see what you mean now. Your getting more flow/velocity at the base of the block and towards the top of your fins the flow/velocity is slower or almost stagnate. You can see the effect of it in the thermo graph you got from Roscal also. I know why your seeing that. It's just the nature of the impingement. The velocity/flow is faster at the base in a thin layer where the water hits it and is deflected off the surface of the base. Then there is eddies (water swirling up and away from the faster layer), that swirl up and almost back the opposite way slowing the water flow down. How to change that I don't know. Some how you would need to direct the some of the flow/velocity at the top of the fins also.
what's happening on a big scale.
If the nozzle exit is made big enough, I would think about adding some kind of deflector that sits half way down inside your channels and extends just enough into the center of the nozzle grabbing some of that faster moving water. Use maybe, thin copper sheet?