  Viscoelastic liquid transfer from one surface to another is a process that
finds applications in many technologies, primarily in printing. Here,
cylindrical shaped capillary bridges pinned between two parallel disks are
considered. Specifically, the effects of polymer mass fraction, solution
viscosity, disk diameter, initial aspect ratio, final aspect ratio, stretching
velocity and filling fraction (alike contact angle) are experimentally
investigated in uniaxial extensional flow. Both Newtonian and viscoelastic
polymer solutions are prepared using polyethylene glycol (PEG) and polyethylene
oxide (PEO), with a wide variety of mass fractions. The results show that the
increase in polymer mass fraction and solvent viscosity reduces the liquid
transfer to the top surface. Moreover, the increase in the initial and final
stretching height of the capillary bridge also decreases the liquid transfer,
for both Newtonian and viscoelastic solutions. Finally, the shape of the
capillary bridge is varied by changing the liquid volume. Now, Newtonian and
viscoelastic solutions exhibit opposite behaviors for the liquid transfer.
These findings are discussed in terms of interfacial shape instability and
gravitational drainage.
