Quote:
Originally posted by unregistered
Les
quite excellent, extraordinary fit
define some terms for me
r = what amounts to the 'effective' area ?
so how did you arrive at this value ?
more crucially, is it a function of the (opposite side) die area - or the nozzle dia ?
I have difficulty understanding it being independent of the nozzle dia
the real value of H is 0.013m
a shame the nozzle configuration is so different
so why is the correspondence so good ?
a ‘monkeys typing the encyclopedia’ thing ? (distressing, don't like)
here, try another
the -U values are: D = 0.010, H = 0.005m
(I'm thinking we're gonna fall off the rails here)
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Yes the agreement is somewhat scary and probably unreal but worthy of of further investigation.
Wanted to use two values for r
(1)the min value(2.5D) allowed,this gives the max h value,to use as as an "effective impingement area. area".
(2)an r value representative of the bp area (30mm?) to get by manipulation a value to use as "background convection"*.
However as 2.5D(36.25mm) in the 0.57"(14.5mm) case is larger than the bp area I decided,somewhat arbitarily, to use the same r value of 25mm. This 25mm was intended as representative of a 50x50mm bp.Unfortunately mid way thro calcs memory said a more realistic bp was 60x60mm and used this in Waterloo calcs. Probably should redo with r=30mm(and correction of D= 0.0145 not 0.014)but ... ..and quick look showed little difference.
Apologise if this is as clear as mud but .................
Can (and have 1/4 done,somewhere) the two r (and hence two h) sums when nozzle diam approaches 3mm.
Using "the real value of H is 0.013m" get
Get the same for "the -U values are: D = 0.010, H = 0.005m".
Will "Press (Calculate Now) to calculate anyway"for both cases,but allow a little time ........ slow and oft befuddled brain.
Dunno whether to change r to 30mm.
.* As used in last my post here (but called Wall Jet)
http://forums.procooling.com/vbb/sho...5&pagenumber=7