Breakup of a Fluid Thread in a Confined Geometry: Droplet-Plug Transition Perturbation Sensitivity and Kinetic Stabilization with Confinement

Published

May 26, 2004

Author(s)

John G. Hagedorn, Nicos Martys, Jack F. Douglas

Abstract

The breakup of a fluid thread surrounded by another Newtonian fluid in a coaxial tube in the absence of imposed flow is investigated using the Lattice Boltzmann (LB) model. We observe a confinement-induced transition between spherical droplets to plugs in the late-stage of capillary breakup when the tube radius R_tube becomes less than approximately twice the inital thread radius R_thread and metastable distorted droplets ('capsules') form at intermediate levels of confinement. The interaction of the liquid components with the tube boundary influences the rate of capillary breakup in confined threads and a strong slowing of instability growth ('kinetic stabilization') is generally found when the thread and tube have comparable dimensions. The thread breakup process for the confined threads is sensitive to the nature of the initial thread perturbation- discrete impulsive perturbations led to breakup through a bulging instability developing from near the tube wall followed by thread breakup through an in-pinch instability while random impulses along the thread led to a complex breakup process involving a competition between the capillary wave and end-pinch type breakup process. We also briefly consider the breakup of fluid threads between parallel plates and find similar phenomena to fluid threads confined to tubes.

Citation

Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)

Volume

39

Issue

No. 5

Pub Type

Journals

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Keywords

capillary breakup, instability, Lattice Bolzmann, surface tensions, Taylor-Tomotika

Citation

Hagedorn, J. , Martys, N. and Douglas, J. (2004), Breakup of a Fluid Thread in a Confined Geometry: Droplet-Plug Transition Perturbation Sensitivity and Kinetic Stabilization with Confinement, Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=860489 (Accessed September 17, 2024)