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research-article

Drag reducing flows by polymer solutions in annular spaces

[+] Author and Article Information
Michell Luiz Costalonga

Master student, LAMEFT-PPGEM, Department of Mechanical Engineering, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
mlcostalonga@gmail.com

Bruno V. Loureiro

Professor, LAMEFT-PPGEM, Department of Mechanical Engineering, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
bruno.loureiro@ufes.br

Edson J. Soares

Professor, LABREO-PPGEM, Department of Mechanical Engineering, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
edson.soares@ufes.br

1Corresponding author.

ASME doi:10.1115/1.4038531 History: Received May 25, 2017; Revised October 18, 2017

Abstract

We analyze the use of water solutions of Xantham Gum for drag reduction (DR) in annular spaces. We provide a direct quantitative comparison between the DR in an annulus and that in straight tubes. We can fairly compare the data from the two geometries by using the general definition of the Reynolds number, which is independent of the geometry. With such a definition, the product of the friction factor by Re is a constant in laminar flows. Moreover, the friction factor for a turbulent flow of Newtonian fluids in an annulus fits Colebrook's correlation. Our main results show that the DR is more pronounced in annular spaces than tubes. We believe this is due to the relative increase of the buffer zone in an annular geometry.

Copyright (c) 2017 by ASME
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