Shape relaxation of an elongated viscous drop

Contactless prompt tumbling rebound of drops from a sublimating slope

“…The drop rapidly detaches from the surface by rotating almost as a rigid body. The transition to a different rebound regime at high viscosities can be understood by comparing the drop relaxation time t rel ∝ μD 0 /2σ [43] to the characteristic oscillation time τ , whose ratio is proportional to Oh. Indeed, at high viscosities, when t rel /τ ∼ Oh > 1, the longer t rel delays drop recoiling and leads to sustaining the drop rotational energy during tumbling.…”

Effect of solvent addition on bitumen–air bubble attachment in process water

“…Since there are no organic carbon materials in the original simulated process water, the detected organic carbons are considered to be completely released from the immersed bitumen or diluted bitumen. Adding the solvent to bitumen decreases the viscosity of bitumen Moran et al, 2003), which makes the surface active molecules in the bitumen more mobile to move to the bitumen-water interface. Upon in contact with water at the interface, the surfactants become ionized as follows (Schramm et al, 2000;Takamura and Chow, 1985):…”

Emulsion drops in external flow fields — The role of liquid interfaces

“…On the experimental side, drop deformation experiments are performed in optical flow cells, such as: (a) the four roll mill that creates all flow fields from pure elongational to pure shear flow [45,[59][60][61][62], (b) the parallel band shear cell for simple shear flow [10,39,63], (c) Couette geometries consisting of concentrically rotating or counterrotating transparent cylinders [47,64,65], (d) rotating parallel disks [66], cone/plate [67,68] and sliding glass plate devices in combination with a movable microscope [69], and more recently (e) miniaturized and microfluidic flow cells [30,32,70], and micropipettes [71].…”