needle valve spreadsheet?

R

rjack

Active Member
Does anyone have a spreadsheet that illustrates the changes in choked flow through a needle valve as IP increases?
Like if I wanted to have 0.65 L/min flow at 75m what would the flow be at the surface? I have seen the formulas for this and I'm not sure I can make the not quite algebraic way excel reads a formula do what its supposed to do. Was hoping someone had already coded this.
 
i posted a scr sim on rebreather world think its in one of the storm trooper thread ,

if you cant find it send me a pm with email address ill send you a copy ,
 
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