$A_B$	Cross section area of the bubble	m2
$A_{\mathrm{film}}$	Cross section area of the liquid film	m2
$A_{\mathrm{MC}}$	Cross section area of the microchannel	m2
D	Internal diameter of the tube	m
$d^{*}$	Liquid film development length	m
$d_B$	Distance between two consecutive bubbles	m
$\overrightarrow{f}$	Surface tension contribution	Pa·m−1
g	Acceleration due to gravity	m·s−2
k	Curvature of the interface	m−1
$L_{\mathrm{s}}$	Bubble length	m
p	Pressure	Pa
$Q_{\mathrm{I}}$	Volumetric flow rate of the liquid moving faster than the bubble	m3·s−1
$Q_{\mathrm{T}}$	Volumetric flow rate of the liquid flowing in the tube	m3·s−1
R	Internal radius of the tube	m
$\overrightarrow{v}$	Velocity vector	m·s−1
$V_B$	Taylor bubble velocity	m·s−1
$V_{\mathrm{film}}$	Mean velocity in the liquid film	m·s−1
$V_{\mathrm{inlet}}$	Mean velocity at the inlet	m·s−1
$V_{\mathrm{L}}$	Mean velocity in the liquid	m·s−1
$V_{\mathrm{TP}}$	Two-phase velocity	m·s−1
$V_{\mathrm{wall}}$	Velocity of the wall in the CFD model	m·s−1
x,r	Coordinates in the 2D simulation domain	m