Quote:
Originally posted by Cathar
There's a second effect that happens here too. The width of the nozzle also dictates the width of the jet impingement region. The higher the volumetric flow rate, the wider the jet region. Also, the wider the nozzle, the wider the region - to an extent - if the nozzle is made too wide then no real jet region forms and the water just mashes out the side and never really hits the base hard where we want it.
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I think you can see an example of this in BillA's MCW462-H vs MCW462-UH data.
One can compare the thermal resistance of the two blocks at operating points with equal inlet nozzle velocity. Even though the MCW462-UH is has a greater volumetric (and mass) flowrate at the same inlet velocity, the MCW462-H still has lower thermal resistance.