Pro/Forums - View Single Post - "Nazca"

bobo5195 · 01-18-2006, 05:46 PM

the base of the cup holes needs to flat smooth and square. Putting a cone in the middle will lower performance and putting a radius on the edge in this case is not a good idea (this is counter to normal design principals.)

I'll try this weekend and write up something in the wiki about jet impingement and how it works but these days i dont seem to have the time for things like that so i make no promises and whatever i have time for this weekend is going to be very bried and probably a bit crap.

Key thing to remember is that the spacing of the plate and the nozzle exit is exceptionally important and given you nozzle size is going to be very small i have concerns about the construction. I would think the MAX you would want to make it is 3 times the nozzle diameter so good luck! Above about 9 to 15 times and its not jet impingement. The walls of the holes need not be that deep but it requires some serious number crunching and fluid mech knowledge to know what "not that big" means. The characteristic length scale is the nozzle exit diameter so maybe 10 times that is a good guess.

01-18-2006, 05:46 PM	#30
bobo5195 Cooling Savant Join Date: Aug 2005 Location: uk Posts: 400	Re: "Nazca" - Waterblock Concept the base of the cup holes needs to flat smooth and square. Putting a cone in the middle will lower performance and putting a radius on the edge in this case is not a good idea (this is counter to normal design principals.) I'll try this weekend and write up something in the wiki about jet impingement and how it works but these days i dont seem to have the time for things like that so i make no promises and whatever i have time for this weekend is going to be very bried and probably a bit crap. Key thing to remember is that the spacing of the plate and the nozzle exit is exceptionally important and given you nozzle size is going to be very small i have concerns about the construction. I would think the MAX you would want to make it is 3 times the nozzle diameter so good luck! Above about 9 to 15 times and its not jet impingement. The walls of the holes need not be that deep but it requires some serious number crunching and fluid mech knowledge to know what "not that big" means. The characteristic length scale is the nozzle exit diameter so maybe 10 times that is a good guess.