Title: Dripping, jetting, breaking and „gobbling” of polymeric liquid jets
Authors: McKinley, G.H.
Clasen, Christian
Bico, J.
Entov, V. #
Issue Date: Nov-2004
Conference: AIChE Annual Meeting 2004 location:Austin, TX, USA date:7-12 November 2004
Abstract: In free-surface flows of low-viscosity complex fluids such as dilute polymer solutions and micellar fluids, viscous effects are frequently negligible. The dominant force balance may involve elastic, inertial gravitational and capillary forces, and one is interested in the rarely-studied limit of inviscid viscoelastic fluid motion. A quantitative analysis of such flows can be carried out using high-speed digital video-imaging. To illustrate this, we investigate thin jets of dilute polymer solutions at flow rates corresponding to a transition from dripping to jetting. The study reveals a novel periodic break-up process. In the initial stages, Rayleigh disturbances grow and as viscoelastic effects grow the jet evolves towards the familiar beads-on-a-string structure. However the jet terminates in a large terminal drop which is almost stationary and appears to progressively swallow or ‘gobble’ the beads on the string. As the mass of the terminal drop increases, it accelerates and ultimately pinches off. The process then repeats leading to a quasi-periodic break-up process, with droplets significantly larger than the scale of the jet or nozzle. A simple axial momentum balance incorporating capillarity, gravity and fluid elasticity but neglecting viscous stresses captures many of the essential features of this “gobbling” phenomenon
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Soft Matter, Rheology and Technology Section
# (joint) last author

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