Quote:
Originally posted by Aleck
As only the bottom part walls of the cavity is involved in the secondary impingement...so i was thingking if making helical groves on the walls will give added performance..?
The groves could be easily made by using a small inner threadmaker (taps)..
Theoriticaly, this will surely thin the boundary layer of the fluid flowing out of the cavity walls because of the turbulance created by the whirling effect
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Yes, I had considered tapping the holes like you say. Aside from the difficulty of tapping into copper into such small holes and not breaking taps when doing so, I was concerned that the pitch of the thread would be such that no real swirling would develop as the vertical velocity is just too quick. Instead there may be a more dangerous scenario developing whereby the water inside the thread grooves remains fairly static and the water just rushes up the middle. I never directly experimented with it though.