GK-e

eReference Springer Verlag

Arrays of nozzles

(a) The single round nozzle (SRN), (b) the single slot nozzle (SSN), (c) the array of round nozzles (ARNs), and (d) the array of slot nozzles (ASNs).)

Impinging flow from round and slot nozzles

Optimization of geometry of arrays of round nozzles and slot nozzles

With the side condition H = constant, the almost same optimum geometrical data occur for arrays of round nozzles and slot nozzles (D = 2 · B):

D_opt = 0,2 · H

L_T,opt = 1,4 · H

Influence of nozzle shape (contraction coefficient e)

For sharp-edged round and slot orifices, the jet is constricted and the cross-sectional area reduces by the factor ε.

Jet contraction at hole and slot aperture plates.

For the diameter of a round jet from an orifice it can be written

D¢ = ·D

The width of a planar jet from a slot orifice is analogously

B¢ = e ·B

For sharp-edged orifices the contraction coefficient has the value

e_Blende = 0,61