Immiscible liquid-liquid displacement in capillary tubes: viscoelastic effects

Flow regimes for the immiscible liquid–liquid displacement in capillary tubes with complete wetting of the displaced liquid

“…Also, the analysis of Allouche et al (2000) is in agreement with the recent numerical analysis presented by Sousa et al (2007) and Dimakopoulos & Tsamopoulos (2007). Soares, Carvalho & de Souza Mendes (2008) experimentally investigated the effect of viscoelasticity on the liquid-liquid displacement and found that, within the covered range, the fraction of mass deposited at the wall is higher when viscoelastic Boger-like fluid is displaced by a Newtonian one when compared with a Newtonian-Newtonian displacement. As discussed previously, this result follows the same trend as the gas-viscoelastic Boger-like displacement.…”

The Role of Air–Electrode Structure on the Incorporation of Immiscible PFCs in Nonaqueous Li–O2 Battery

“…The PFC-modified Li–O 2 system investigation was extended, and the wettability phenomenon involving two immiscible liquids and solid carbon particles was explored. − The penetration rates and interfacial tensions of 1 M LiTf/triglyme and PFCs in the investigated activated carbon powder were determined via the Washburn capillary rise method and pendent drop and are deliberated at length in Supporting Information sections 3.2 and 3.3, respectively. With the aim of accounting not only for the free energy of cohesion within each liquid and the free energy of adhesion of the interface between two liquids, but also for the adhesion of each liquid to the porous carbon cathode, the investigation was further extended.…”

“…These two observations strengthen the partial wettability scenario with a preferential electrolyte wetting also derived from contact angle measurements (Figure ). , When two immiscible fluids were simultaneously in the carbon powder and occupied the pore space, interfaces of complex geometry formed between these phases and the distribution of the two immiscible phases in the void space of the porous carbon depended on the wettability of the solid carbon surface. Because of surface tension phenomenon, when 1 M LiTf/triglyme entered the PFC-prefilled capillary tube, it adhered to the solid wall of the capillary tube while the nonwetting fluid, PFC, tended to stay away from the solid walls.…”