Patent ID: 6132512
Filing Date: 2000-10-17
Classification: C23C,C30B

Abstract:
A gas ejection head comprising:a planar nozzle head body including a plurality of nozzle orifices, at least one of said nozzle orifices having a minimum cross-sectional area F.sub.c (m.sup.2) satisfying the following expression:F.sub.c .ltoreq.m.sub.c /[{2/(k+1)}.sup.1/(k-1) {k/(k+1)}.sup.1/2 {2(p.sub.1 /v.sub.1)}.sup.1/2 ]wherein: m.sub.c =the mass flow (kg/s) per orifice;k the ratio of specific heats (a constant dependant on the gas);p.sub.1 =the pressure (Pa) of the gas at the gas inlet side of the orifice; andv.sub.1 =the specific volume (m.sup.3 /kg) of the gas at the gas inlet side of the nozzle orifice.