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Drag reduction in polymer solutions based on splash
visualization
E. Sabadini, M. Alkschbirs
A1 Departamento de Físico-Química, Universidade
Estadual de Campinas, Caixa Postal 6154, CEP 13083-970, Campinas, São
Paulo, Brazil
Abstract:
Abstract. The drag-reduction phenomenon is produced when very small
amounts of some substances such as high-molar-mass polymers are dissolved
in a solvent. In this paper some aspects of drag reduction were studied
through the observation of the liquid deformation due to the impact of a
droplet against a shallow surface using aqueous solutions of
poly(ethylene oxide). The presence of polymer leads to a change in the
splash morphology, mainly for the Rayleigh jet. The amplitude of the
Rayleigh jet is highly sensitive to the concentration and molar mass of
the polymer and can be used to determine the percentage of the drag
reduction.
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