Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
DRAG REDUCTION IN NUTRIENT SALINE SOLUTION
Submission Author:
Renata da Silva , ES
Co-Authors:
Renata da Silva, Edson Soares, Renato Siqueira, Leonardo dos Santos , Aloysio Abdo Silva Campos
Presenter: Renato Siqueira
doi://10.26678/ABCM.COBEM2019.COB2019-0398
Abstract
Drag reduction by high molecular weight polymers has been studied over the past decades and presents several applications in many industrial processes. Soluble drag reducing polymers have also been shown to produce beneficial effects on blood circulation and may represent a way to treat cardiovascular disorders, like atherosclerosis and hypertension. However, the efficiency of these polymers as friction factor reducers is not constant due to degradation caused by the turbulent flow. In the present work, we investigate the effects of concentration and degradation of three soluble polymers in the drag reduction capacity of a nutrient Krebs-HEPES saline solution. Polyacrylamide (PAM), Polyethylene Oxide (PEO) and Xanthan Gum (XG) are tested in a cylindrical double gap rheometer device for the concentrations of 10, 50 and 100ppm. Viscosity and flow curves were obtained for all concentrations, in order to understand the rheological characterization of the fluid, and constant shear rate tests were performed to analyze the loss of efficiency along the time of the experiments. All the tests were conducted using both distilled water (reference solution) and Krebs-HEPES (nutrient saline solution) as solvent. Our findings suggest that the nutrient saline solution composition doesn’t make PAM and PEO to react differently, but affect the efficiency of XG. The results may contribute to better understand the interaction of polymers chains with a different solvent, which has physiological applications.
Keywords
Bioengineering, Rheology, drag reduction, polymer, Nutrient saline solution
