Quote:
Originally posted by Cathar
Now myv65 was onto something when he talks about what I call diminishing returns with respect to making the nozzle smaller than a small number of millimeters. For a 3PSI pump like an Eheim 1250, the smaller the nozzle is made, the higher the water velocity, but to a point. Eventually you reach a stage where the water velocity goes up VERY slowly as the nozzle is decreased in size. A bit like plotting a hyperbola.
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Depends on what your block design is and it's surface geometry. Throw in micro channels and too small of a nozzle size will kill the flow rate to the point your channels no longer function as intended. Your right. Can only make the nozzle diameter so small till the point that velocity levels off and then drops along with flow rate.
Quote:
Originally posted by Cathar
It's easy to think that making the nozzle smaller will boost velocity and hence performance, but the reality is that it's not that simple. There are many things to consider here, and it's not all that obvious at first glance.
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I found that out also. Making it smaller will just kill the flow rate to the point the impingement is useless. Shape of the nozzle effects the impingement region also which I find interesting. The circlular impingement is actually the worst compared to an ellipse, triangle, the square in that order. Have to consider the shape to work with in your design and take advantage of it. There is alot of variables to keep in mind. One will effect the other and there is a balance in it all. Impingement by it's self I believe can be very promising.