颗粒物料浆体流变特性变化及其机理分析  

Variant Rheological Properties of Particle Material Slurry and Mechanism Analysis

作　　者：曹华德[1] 曹斌[1] 夏建新[1] 

机构地区：[1]中央民族大学生命与环境科学学院,北京100081

出　　处：《矿冶工程》2014年第2期1-3,9,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金项目(51179213;51209238;51339008)

摘　　要：利用毛细管流变仪进行了流变特性试验,并结合已有的浆体流变特性试验结果,得到了不同浓度浆体流变特性变化规律。结果表明,浆体粘度随浓度增加而加大,并存在临界转变浓度。当浓度小于临界浓度时,粘度系数变化缓慢,但超过临界浓度后,粘度系数急剧加大。其转变机理是浆体中颗粒作用方式产生了变化,由低浓度时颗粒间断碰撞向高浓度时颗粒持续接触转变。研究结果揭示了不同浓度浆体流变特性变化的物理机制。Based on previous slurry rheological property test resulis, experiments with capillary rheometer have led to a varying pattern of rheological properties of slurry with different concentration. Results show that the slurry viscosity increases with an increase in its volume concentration and there exists a critical volume concentration in the graph of relative viscosity plotted against volume concentration. The viscosity coefficient changes slowly as the concentration is less than the critical value, but increases rapidly after the concentration exceeds that critical point. Mechanism for the phenomena is that behavior between particles changes from intermittent collision at low concentration to constant contacts between particles at high concentration. The experimental research has revealed the physical mechanism for the change in the rheological property of slurry with different concentration.

关 键 词：管道输送 流变特性 颗粒 浆体 临界浓度 粘度系数 

分 类 号：O359[理学—流体力学]