摘要
根据实验数据探讨了剪切力作用下胶体颗粒凝聚过程的机理:颗粒聚集体在絮凝过程中经历生长和破碎两个阶段,在生长阶段主要影响因素为絮凝剂、G值和溶液的pH值。提出了表征剪切力大小的能量概念G值,并给出不同流动条件下的估算方法及物理意义。最后讨论了在快混初期出现的三个特殊现象:突变、衰减和震荡。
An analysis of aggregation and breakup mechanics of particles under a shear flow was carried out based on the experimental data. The particle-aggregation experience growing and breakup phases during the aggregation process and the main inflection factors in the growing process are coagulant, G value and pH value of the solution. G value, an energy concept was put forward to represent the magnitude of the shear flow. Also, estimate methods and physical significance of G value in different flow conditions were given in the paper. Finally, three special phenomena appeared in the initial stage of fast mixing were discussed, which were mutation, attenuation and concussion.
出处
《热科学与技术》
CAS
CSCD
2007年第3期189-192,共4页
Journal of Thermal Science and Technology
关键词
絮凝
G值
机理研究
aggregation
G value
mechanism research