Film thickness distribution in gravity-driven pancake-shaped droplets rising in a Hele-Shaw cell.

ABSTRACT: We study here experimentally, numerically and using a lubrication approach, the shape, velocity and lubrication film thickness distribution of a droplet rising in a vertical Hele-Shaw cell. The droplet is surrounded by a stationary immiscible fluid and moves purely due to buoyancy. A low density difference between the two media helps to operate in a regime with capillary number Ca lying between 0.03 and 0.35, where Ca =μ_o U_d /γ is built with the surrounding oil viscosity γ₀ , the droplet velocity U_d and surface tension γ. The experimental data show that in this regime the droplet velocity is not influenced by the thickness of the thin lubricating film and the dynamic meniscus. For iso-viscous cases, exper

SUBMITTER: Shukla I 

PROVIDER: S-EPMC7116120 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature