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Open AccessArticle

Influence of the Polarity of the Electric Field on Electrorheometry

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Departamento de Ingeniería Mecánica y Diseño Industrial, Escuela Superior de Ingeniería, Universidad de Cádiz, Av. Universidad de Cádiz, 10, Puerto Real, 11519 Cádiz, Spain
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Departamento de Engenharia Mecânica, Centro de Estudos de Fenómenos de Transporte (CEFT), Faculdade de Engenharia da universidade do Porto, Rua Dr. Roberto Frias s/n, CP4200-465 Porto, Portugal
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Departamento de Engenharia Química, Centro de Estudos de Fenómenos de Transporte (CEFT), Faculdade de Engenharia da universidade do Porto, Rua Dr. Roberto Frias s/n, CP4200-465 Porto, Portugal
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Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5273; https://doi.org/10.3390/app9245273
Received: 5 November 2019 / Revised: 23 November 2019 / Accepted: 25 November 2019 / Published: 4 December 2019
Uniaxial extensional flow is a canonical flow typically used in rheological characterization to provide complementary information to that obtained by imposing simple shear flow. In spite of the importance of having a full rheological characterization of complex fluids, publications on the rheological characterization of mobile liquids under extensional flow have increased significantly only in the last 20 years. In the case of the rheological characterization of electrorheological fluids, the situation is even more dramatic, as the ERFs have been exclusively determined under simple shear flow, where an electrorheological cell is attached to the rotational rheometer generating an electric field perpendicular to the flow direction and that does not allow for inverting the polarity. The very recent work published by Sadek et al., who developed a new electrorheological cell to be used with the commercial Capillary Breakup Extensional Rheometer (CaBER), allows for the very first time performing electrorheometry under extensional flow. By means of the same experimental setup, this study investigates the influence of the polarity of the imposed electric field on the filament thinning process of a Newtonian and an electrorheological fluid. Results show that a polarity against the gravity results in filament thinning processes that live longer or reach a stable configuration at lower intensities of the applied electric field. View Full-Text
Keywords: electrorheology; extensional flow; capillary breakup extensional electrorheometry (CaBEER); dielectric liquid bridge electrorheology; extensional flow; capillary breakup extensional electrorheometry (CaBEER); dielectric liquid bridge
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García-Ortiz, J.H.; Sadek, S.H.; Galindo-Rosales, F.J. Influence of the Polarity of the Electric Field on Electrorheometry. Appl. Sci. 2019, 9, 5273.

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