K coefecient of nozzles
K coefecient of nozzles
(OP)
Hi
do anyone know what is the K value of discharge nozzles of wash down lines and fire hose reels?
do anyone know what is the K value of discharge nozzles of wash down lines and fire hose reels?





RE: K coefecient of nozzles
K2=(1-beta^2)*0.8* sin (theta/2)/(Beta^4)
Beta = area of outlet /Area of inlet
Theta is the cone angle as the nozzle reduces.
in my 1988 version of the book it is on page 52.
RE: K coefecient of nozzles
what velocity is used to detemine the pressure loss; inlet or outlet velocity?
RE: K coefecient of nozzles
Note that CRANE defines
beta = d1/d2
d1 = smaller diameter
d2 = larger diameter
beta is defined in page 2-11 Title: contraction and enlargement
mechanicaldup... in the Flow of Fluids Technical paper subindex 1 always refers to the smaller diameter and subindex 2 to the larger diameter...
so, K2 is referring to the larger diameter.
In case of a tapered contraction (your discharge nozzle), K2 refers then to the INLET (larger diameter).
the relationship between K1 and K2 is:
K2 = K1/beta^4
saludos.
a.