Quote:
Originally posted by Cathar
I would not recommend getting closer than 4mm for most any setup/nozzle configuration, and depending on how large your nozzle is, you may see better results being a little further away (say up to 8mm).
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Be interested to see the work on which this recommendation is based.
For 1.5mm nozzles results* indicate that h increases as the nozzle/plate*** seperation(H) is decreased from 3mm to 1.5mm.
For other nozzle IDs I keep an open mind until I see some data (or undertand the theory).
However all the calculations I have done with Flomerics** show an increase in h with decreasing H ("down to" and "below" the calculator's lower limit of H=2D)
*
http://widget.ecn.purdue.edu/~eclweb/jet_benchmark/
**
http://www.coolingzone.com/Content/D...as/fcalc10.htm
*** Ceiling is lowered "along with nozzle" to 1.5mm (In light of Cathar's 12.13 am post)