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Experiment Study of Drag-Reducing Characteristics for Aqueous Polyacrylamide Solution

Author: CaiWeiHua
Tutor: ZhuMengSheng
School: Harbin Institute of Technology
Course: Fluid Mechanics
Keywords: High polymer Polyacrylamide aqueous solution Drag reduction Energy-saving
CLC: O357.5
Type: Master's thesis
Year: 2008
Downloads: 106
Quote: 2
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Abstract


In 1948, Toms on the first session of the International Conference on rheology, published experimental results on polymer drag reduction. Drag reduction of this unique phenomenon has attracted many scholars of all ages, the problem of drag reduction is increasingly important position in modern fluid engineering. Drag reduction effect so that the the DRA fluid resistance in the course of transmission is substantially reduced; at the same time due to the deterioration of the heat transfer performance of the drag-reducing fluid, reducing the heat loss along the drive, so that the drag-reducing fluid in the district cooling, heating and other systems and has broad prospects for industrial applications. Accordingly, the additive drag reduction on the HVAC field has important significance. High polymer drag reduction is because this technology has great economic value, and have invested less and drag reduction effect notable features. Can be the kind of high polymer as DRA polyacrylamide than other polymers have a stronger shear and high temperature resistance. The paper begins with a brief overview of several existing polymer drag reduction mechanism, so that the deeper the departure from the viscoelastic theory, derived according to Professor Dou when averaged velocity, turbulent fluctuation and Reynolds stress formula to analyze Newton fluid, and when the drag-reducing fluid speed, longitudinal velocity fluctuation, and the laminar flow boundary layer flow velocity distribution difference. Followed in the hydraulics laboratory bench build a closed cycle system drag reduction, water experimental results show that the water in laminar flow well with the Hagen-Poiseuille law, in the turbulent region in line with the Prandtl-Karman law drag reduction to rate pipe diameter and PAM aqueous solution drag reduction experiments provide strong evidence; establish the drag reducing experimental results based on three benchmarks: Hagen-Poiseuille law, Prandtl-Karman law and Virk lines; derived drag reduction experiment required friction resistance coefficient and Reynolds number relationship. Finally, according to the different temperatures and concentrations and different Reynolds numbers, the drag reduction experiments in PVC pipe and copper pipe, so as to arrive PAM drag reduction effect: under the same temperature and Reynolds number, the drag reduction effect as the solution increasing concentrations of enhanced; in the same concentration and the Reynolds number, drag reduction effect is enhanced with increasing solution temperature; 200 ppm of the aqueous solution of PAM in the PVC pipe in the maximum drag reduction percentage of 65% at a temperature of 10 ° C or when, at a temperature of 20 ℃ to 50%; PAM aqueous solution of 200 ppm of copper pipe in the maximum drag reduction percentage at a temperature of 17 ° C when 63% to 38% at a temperature of 60 ° C; The experimental results show that PAM aqueous solution at a low temperature having a high Save barrier effect, while there is a significant degradation in high temperature conditions, consistent with the experimental results, etc. USChoi, the experimental results obtained with a reference value for engineering applications.

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Viscous fluid > Turbulence ( turbulence )
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