(a) Definition of D_{new c} with in this snapshot d_p = 190 μm, D_x = 25 mm and D_y = 20 mm. (b) Mass flow rate Q normalised by versus D_{new c}∕W for all the experiments with d_p = 190 μm. The full line represents the asymptotic regime of equation (1) when D∕d_p ≫ 1 with C = 1.41 (case D_y = 0). The dashed line represents the asymptotic regime of equation (2) when D_{new c} ∕W ≫ 1 (case D_x = 0).