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Figure 5 Relative error ([calculated flow – actual flow)/actual flow] · 100) of both the interaliasing distance (R_calc[IAD]) and conventional flow convergence (R_meas[FC]) methods for estimating the flow rate depending on the distance to the orifice, which is expressed as normalized distance. The normalized distance equals to r/d, r being the radius of the flow convergence surface and d the diameter of the orifice (see text).