ρA, ρB	Fluid phases
μA, μB	Viscosities: 1.0 × 10−3 Pa·s
σ	Interfacial tension between phases A and B: 7 × 10−2 N·m−1
L	Distance: 500 µm
θW,in	Contact angles of the inner surface
θW,out	Contact angles of the outer surface
θW,1	Contact angle of the front faces of the plates
Uin	Flows at a constant volumetric flow rate with a uniform velocity
Oh	Ohnesorge number: Oh = μA/(ρAσL)0.5 = 5.35 × 10−3
Re	Reynolds number: Re = ρALUin/μA = 0.9982
Ca	Capillary number: Ca = μAUin/σ = 2.857 × 10−5
h	Height of the liquid phase penetrating the vertical capillary tube
σ	Surface tension of the liquid phase
r	Radius of the capillary tube
ρ	Density of the liquid phase
g	Acceleration due to gravity
∂s/L	Interfacial displacement