Table 1: Properties of the fluids used in the experiments.

Wetting phase, water (with 0.05 g/L nigrosine)

Density, 1000 kg/m3
Dynamic viscosity,  N.s/m2

Non-wetting phase, mineral oil

Density, 880 kg/m3
Dynamic viscosity, 0.068 N.s/m2
Interfacial tension [22], γ
0.049 N/m

Viscosity Ratio, M 0.015