Abstract
Displacements of a viscous fluid by a miscible fluid of a lesser viscosity and density in cylindrical tubes were investigated experimentally. Details of velocity and Stokes streamline fields in vertical tubes were measured using a DPIV (digital particle image velocimetry) technique. In a reference frame moving with the fingertip, the streamline patterns around the fingertip obtained from the present measurements confirm the hypothesis of Taylor (1961) for the external patterns, and that of Petitjeans and Maxworthy (1996) for the internal patterns. As discussed in these papers, the dependent variable, m, a measure of the volume of viscous fluid left on the tube wall after the passage of the displacing finger, is a parameter that determines the flow pattern. When m>0.5 there is one stagnation point at the tip of the finger; when m<0.5 there are two stagnation points on the centerline, one at the tip and the other inside the fingertip, and a stagnation ring on the finger surface with a toroidal recirculation in the fingertip between the two stagnation points. The finger profile is obtained from the zero streamline of the streamline pattern.
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Acknowledgements
This work was supported by the NASA Microgravity Program under grant Number NAG3–2125 to the University of Southern California.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00348-004-0842-y
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Kuang, J., Petitjeans, P. & Maxworthy, T. Velocity fields and streamline patterns of miscible displacements in cylindrical tubes. Exp Fluids 37, 301–308 (2004). https://doi.org/10.1007/s00348-004-0824-0
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DOI: https://doi.org/10.1007/s00348-004-0824-0