Hydrodynamic Properties of Flocculation and Dispersion of Clay Colloid

粘土胶体絮凝与分散的水动力特性

• 批准号: 09460105
• 负责人: ADACHI Yasuhisa
• 金额: $ 6.4万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09460105/
• 关键词: Colloid; Clay; Flocculation; Dispersion; Hidering Sedimentation; Turbulence; Floc Strength; Montmorillonite; アロフェン; スケーリング則; 電気粘性効果

The objective of present research is to clarity the framework of the analysis of the behavior of lay colloid suspension which is vital issue in aquatic enviroment. The obtained results are summariged as follows :1. By using the model colloid, we have successfully developed the experimental procedure to standardize the mixing intensity of turbulent flow in terms of collision frequency between colloidal particles.2. The developed procedure is applied to the analysis of bridging flocculation. With this method, the adsorbing process of pdymer molecules was revealed in terms of hydrodynamics and the rate constant of this process, was determined.3. The strength of flocs is also analysed in the standardiged turbulent flow. We submitted the very simple model to describe the strengh of floc(F)as follows : F=N_c・fwhere N_c is the number of contacts between clusters and f is the cohesive strength at each contact.4. The developed procedure was turned out to be very effective to analyze the system involved in clay particles.5. In the dispersed system, the presence of electrostatic double layer and their interaction were found to be very important to determine the rheology of clay suspension.

本研究的目的是明确的分析框架奠定了胶体悬浮液的行为，这是水环境中的重要问题。主要研究结果如下：1.利用模型胶体，我们成功地发展了一套以胶体粒子间碰撞频率标准化湍流混合强度的实验方法.所开发的程序适用于桥絮凝分析。利用该方法，从流体力学角度揭示了聚合物分子的吸附过程，并测定了该过程的速率常数.本文还分析了标准紊流条件下絮体的强度。我们提出了一个非常简单的模型来描述絮凝体的强度（F）：F=N_c·f其中N_c是团簇之间的接触数，f是每个接触点的内聚强度.所开发的程序被证明是非常有效的分析系统中涉及的粘土颗粒.在分散体系中，静电双电层的存在及其相互作用对粘土悬浮液的流变性有重要影响。

项目成果

Y.Adachi, K.Nakanishi, K.Miyahara and M.Ohtsubo: "Viscosity and yield stress of dilute suspension of Na-montmorillonite"Clay Science for Engineering. 207-212 (2001)

Y.Adachi、K.Nakanishi、K.Miyahara 和 M.Ohtsubo：“Na-蒙脱石稀悬浮液的粘度和屈服应力”工程粘土科学。

Motoyoshi Kobayashi, Yasuhisa Adachi, Setsuo Ooi: "Effect of particle Size on Breakup of Flocs in a Turbulent Flow"Annual Journal of Hydraulic Engineering, JSCE. vol.45. 1249-1253 (2001)

Motoyoshi Kobayashi、Yasuhisa Adachi、Setsuo Ooi：“湍流中颗粒尺寸对絮凝体破碎的影响”水利工程学年刊，JSCE。

Yasuhisa Adachi: "Yield Stress of Sodium Montmorillonite Dispersions in a Electrostaticall Dispersed State"農業土木学会論文集. 200. 53-58 (1999)

Yasuhisa Adachi：“静电分散状态下钠蒙脱石分散体的屈服应力”日本农业和土木工程师学会会刊 200. 53-58 (1999)。

Y.Adachi and T.Wada: "Initial Stage Dynamics of Bridging Floculation of Polystyrene Latex Spheres with Polyethylen Oxide"J.Colloid Interface Sci.. vol.229. 148-154 (2000)

Y.Adachi 和 T.Wada：“聚苯乙烯乳胶球与聚环氧乙烷桥接絮凝的初始阶段动力学”J.Colloid Interface Sci.. vol.229。

Kazumi Miyahara, Masami Ohtsubo, Katsuya Nakaishi, Yasuhisa Adachi: "Sedimentation Rate of Sodium Montmorillonite Suspension under High Ionic Strength"Nendo Kagaku. vol.40. 179-184 (2001)

Kazumi Miyahara、Masami Ohtsubo、Katsuya Nakaishi、Yasuhisa Adachi：“高离子强度下蒙脱石钠悬浮液的沉降率”Nendo Kagaku。