$A$	Area of the coupon (L2)
$C$	Bulk IPTG concentration (M L−3)
$d$	Hydraulic diameter (L)
$D$	Dilution rate (T−1)
$D_{aq}$	Diffusion coefficient of IPTG in water (L2 T−1)
$F$	Volumetric flow rate (L3 T−1)
$K_m$	External mass transfer coefficient (L T−1)
$\dot{n}$	Mass transfer rate (M T−1)
$Re$	Reynolds number (-)
$Sc$	Schmidt number (-)
$Sh$	Sherwood number (-)
$t$	Time (T)
$V$	Total system volume (L3)
$\tau$	Average residence time (T)