Fig. 4.

(A and B) Typical fit of the quantity $\zeta -{\zeta }_0=t^3\left(d^2\psi /d{x}^2\right)-t_0^3{\left(d^2\psi /d{x}^2\right)|}_{x=0}$ as a function of $x$ and $\left(\psi -{\psi }_0\right)$ as described in Eq. 3. The symbols ○ and □ represent data obtained for channels (diameter $d=450$ μm, minimum skin thickness $t_0=20$ μm, and film thickness $h=470$ μm) and ($d=180$ μm, $t_0=25$ μm, and $h=205$ μm) filled with perfluorooctane, and △ represents one ($d=450$ μm, $t_0=30$ μm, and $h=480$ μm) filled with nitromethane, respectively. The solid line represents that obtained by using respective fit equations.