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Differential analysis of capillary breakup rheometry for Newtonian liquids

  • Louise L. McCarroll (a1), Michael J. Solomon (a2) and William W. Schultz (a1) (a3)


We present a Newtonian, one-dimensional, differential analysis for capillary breakup rheometry (CBR) to determine the surface tension to viscosity ratio $\unicode[STIX]{x1D6FC}$ . Our local differential analysis does not require specific assumptions for the axial force to preclude its measurement. Our analysis indicates that measuring gradients in filament curvature is necessary to accurately determine $\unicode[STIX]{x1D6FC}$ when axial force is not measured. CBR experiments were performed on five silicone oils ( $0.35~\text{Pa}~\text{s}<\unicode[STIX]{x1D707}<10~\text{ Pa}~\text{s}$ ), three sample volumes, and three strains to evaluate the operating range of the differential analysis and compare its performance to that of a standard integral method from literature. We investigate the role of filament asymmetry, caused mainly by gravity, on the performance of the differential method for the range of conditions studied. Experimental and analytical details for resolving gradients of curvature are also given.


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Differential analysis of capillary breakup rheometry for Newtonian liquids

  • Louise L. McCarroll (a1), Michael J. Solomon (a2) and William W. Schultz (a1) (a3)


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