Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
DRAG REDUCTION IN NUTRIENT SALINE SOLUTION: EFFECT OF CONCENTRATION AND DEGRADATION
Submission Author:
Renata da Silva , ES
Co-Authors:
Edson Soares, Renato Siqueira, Leonardo dos Santos , Anselmo Soeiro Pereira
Presenter: Renata da Silva
doi://10.26678/ABCM.ENCIT2016.CIT2016-0095
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 different types of polymers in the drag reduction capacity of a nutrient Krebs-HEPES saline solution. Three different polymers are tested in a cylindrical double gap rheometer device: Polyacrylamide (PAM), Polyethylene Oxide (PEO) and Xanthan Gum (XG), 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 test 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 makes the polymers to react differently, changing the drag reduction behavior. The results may contribute to better understand the interaction of polymers chains with a different solvent, which has physiological applications.
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