The interaction between two spheres falling in a viscoelastic fluid
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Date
Authors
Caporale, Daniel Freire
Sarasua, Gustavo
Pena, Anton Vernet
Ballesta, Sylvana Varela
Usera, Gabriel
Cabeza, Cecilia
Journal Title
Journal ISSN
Volume Title
Publisher
HEFAT
Abstract
The time evolution of the distance between two identical
spheres falling in a viscoelastic fluid has been analyzed exper-
imentally. The working fluid was a dilute solution of polyacry-
lamide in an aqueous solution of glycerin. Several concentra-
tions of polyacrylamide and glycerin have been used in order to
analyze fluids with different viscoelastic properties. Two experi-
mental configuration allow analyzing the effect of the boundary
conditions. A CCD camera was used to record the movement of
the spheres allowing the computation of evolution of the space
separation between them. It has been found that beyond cer-
tain critical initial elapsed time (tdc) the distance between the
spheres grows in time, while the distance decrease for elapsed
times smaller than the tdc. Reduction of the shear-thinning ef-
fect tends to eliminate the repulsion interaction.
Description
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.
Keywords
Viscoelastic fluid