Book Chapter10.1007/978-3-662-12809-1_49
An experimental investigation of velocity fields around spheres and bubbles moving in non-Newtonian liquids
C Bisgaard,Ole Hassager +1 more
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TL;DR: In this paper, the existence of negative wake behind spheres moving in a non-Newtonian liquid was investigated using tracer particles, and the negative wake was shown to exist in the downward direction away from the rising bubble.
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Abstract: Spheres and bubbles moving in non-Newtonian liquids are known to show several interesting phenomena. For example Hassager [1] found that the liquid velocity behind the bubbles rising in a non-Newtonian liquid is in the downward direction away from the rising bubble. This phenomenon was called the “Negative wake”. Sigh and Coutanceau [2] reported the existence of a negative wake behind spheres moving in a non-Newtonian liquid, by using a visualization technique with tracer particles.
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Citations
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67
Mechanisms of in-line coalescence of two-unequal bubbles in a non-Newtonian fluid
Tsao-Jen Lin,Gen-Ming Lin +1 more
TL;DR: In this article, the authors studied the coalescing mechanism of in-line two-unequal bubbles rising in a bubble column with a non-Newtonian fluid and found that the coalescence of two equal and two unequal bubbles has higher acceleration than two equal bubbles.
47
A study of velocity discontinuity for single air bubbles rising in an associative polymer
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47
References
A finite element code for initial value problems with a Maxwell model
Ole Hassager,C Bisgaard +1 more
TL;DR: In this paper, the authors present numerical methods for the simulation of nonhomogeneous flow of viscoelastic fluids described by models of the Oldroyd-Maxwell type.
5
Effect of finite boundaries on the slow laminar isothermal flow of a viscoelastic fluid around a spherical obstacle
D. Sigli,Madeleine Coutanceau +1 more
TL;DR: In this article, an experimental investigation of the laminar isothermal flow of moderately concentrated polymers (polyethylene oxide) around a spherical obstacle, which moves along the axis of a cylinder at low Reynolds number, is carried out.
Negative wake behind bubbles in non-newtonian liquids
TL;DR: The measurements described here reveal the unexpected result that the liquid velocity behind the bubbles is in the downwards direction away from the rising bubbles, which is called the phenomenon ‘negative wake’.