Quote:
Originally posted by electrip_flip
What is the purpose of 'jet forming'?
What is the scientific background?
Will there be a special 'afterburner effect',
like a second acceleration after the water left the nozzle?
Or is its purpose just to minimise retroaction caused by the impingement?
flip
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Seek and you shall find.
Jets develop fully over about a 4d distance. Less than this and what tends to occur is a concentrated "mash" of turbulent water striking the base.
Also, while the jet travelling down will lose a small amount of power due to the distance travelled, it also becomes more turbulent (or so it is hypothesised in scientific papers) and this leads to greater thermal efficiency. Again, search through google. There are many studies of the jet distance vs efficiency effect, and every single scientific paper I read found that getting less than 4d in height results in a performance drop off, hitting a peak plateau between 4-5d (different papers differ on the exact best distance) and then dropping off after that.