(a) Comparison between static pressure drops across the (11–0.5–0.33–0) orifice computed using steady-state k-ϵ RANS model and Low-Re k-ϵ RANS model. (b) and (c) Mean axial velocity within (11–0.5–0.33–0) orifice at and slightly downstream of the orifice at from k-ϵ RANS model and Low-Re k-ϵ RANS model. The horizontal dotted (▪▪▪) line represents calculated from RANS using equation (2).