黄原胶溶液减阻特性实验  

Drag Reduction in Turbulent Pipe Flows of Aqueous Xanthan Gum Solutions

作　　者：张根广[1] 张鸣远[1] 杨万英[1] 朱宪然[1] 

机构地区：[1]西安交通大学能源与动力工程学院

出　　处：《西安交通大学学报》2007年第9期1092-1095,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50576074)

摘　　要：采用较粗水平圆管对两种温度多种浓度黄原胶溶液进行了较系统的实验研究,并应用Metzner-Reed广义雷诺数定义,对管道中不同流动状态的广义雷诺数进行了计算,得到了Fanning系数和广义雷诺数关系图,发现黄原胶溶液从层流到紊流转捩点的广义雷诺数随着溶液浓度的升高而增大,给出了转捩点广义雷诺数与溶液浓度变化的关系表达式.此外还发现:在层流区,黄原胶溶液的Fanning阻力系数与广义雷诺数之间具有良好的线性关系,与牛顿流体阻力系数图吻合,这与前人的理论分析及实验研究结果一致;在紊流区,黄原胶溶液具有明显的减阻效应,减阻效应随着溶液浓度的升高而增大.An experimental investigation on friction pressure drop of aqueous Xanthan gum solutions in a horizontal pipe with an inside diameter of 25 mm was conducted. Measurements were performed and the generalized Reynolds numbers of laminar-turbulent transition were calculated according to the definition by Metzner-Reed at 15 ℃ and 20 ℃ for the solution concentrations of 0. 04%, 0. 06%, 0. 1%, and 0. 2%, respectively. It is found that the critical generalized Reynolds number of laminar-turbulent transition increases with the solution concentration, and a correlation between the critical Reynolds number and the solution concentration can be derived. In the laminar flow region the Fanning friction factor is linearly dependent on the generalized Reynolds number, and the friction factor chart resembles that of Newtonian fluid. In the turbulent flow region, however, distinct drag reduction can be observed, and it increases with the increase of solution concentration.

关 键 词：黄原胶水溶液 非牛顿流体 减阻效应 

分 类 号：TK123[动力工程及工程热物理—工程热物理]