Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Rheological Behaviour of Diutan Gum and Its Effects as a Drag Reducing Agent
Submission Author:
Walber Ronconi dos Santos , ES
Co-Authors:
Walber Ronconi dos Santos, Edson Soares, Renato Siqueira
Presenter: Walber Ronconi dos Santos
doi://10.26678/ABCM.COBEM2019.COB2019-0781
Abstract
The drag reduction phenomenon by addition of small amounts of polymer has been known for more than 70 years. The synthetic polymers Polyethylene Oxide (PEO) and Polyacrylamide (PAM) and the biological polymer Xanthan Gum (XG) are some of the most used drag reducing agents. Researches on a recent biopolymer, called Diutan Gum (DG), show promising results concerning its drag reduction ability. However, its rheological characteristics lack further information. With this objective, Diutan Gum is analyzed in terms of viscosity and its effects as a drag reducing agent. It is verified that Diutan Gum presents high pseudoplastic behaviour, even for concentrations as low as 25 ppm. Diutan Gum has a lower overlap concentration in relation to Xanthan Gum, which suggests that it has a higher molecular weight. The elastic modulus is more prominent than the viscous modulus for a wide frequency range and concentrations above 750 ppm. Therefore, Diutan Gum is expected to show greater drag reduction than Xanthan Gum.
Keywords
biopolymer, diutan gum, drag reduction
