Measurements of Contact Angles between an Oil–Water Interface and a Fiber by the ACDPAC Technique

Numerical investigation on the velocity fields during droplet formation in a microfluidic T-junction

“…For the investigation of altering the dispersed phase velocity, the capillary number ( = ⁄ ) is fixed by keeping the continuous phase velocity constant. The walls are set to be no-slip, and a constant contact angle model was used with an oil-wetting angle of = 142° (Gu and Li, 1998). For the numerical settings, the PISO scheme is used for pressure-velocity coupling.…”

Shapes, contact angles, and line tensions of droplets on cylinders

“…Since contact angles of liquid droplets on solid substrates provide a valuable characterization of such wetting properties there are numerous experimental and theoretical studies of the shape and the spreading of droplets deposited on a cylindrical substrate (see, e.g., Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]). The morphology of liquid drops on a fiber is particularly interesting insofar as on a planar substrate there is only one, spherical caplike droplet shape, whereas on a cylindrical substrate droplets may exhibit two, topologically different shapes, a "clamshell"-and a "barrel"-type one, depending on the droplet volume, the contact angle, and the cylinder radius [1][2][3].…”

Microscopic treatment of a barrel drop on fibers and nanofibers

“…The potential energy of this molecule is given by Eq. (4). A molecule at a distance l < η from the droplet surface interacts only with those molecules which are present both in the drop and in the interaction sphere described above (Fig.…”