Size, orientation, and strength of Na-montmorillonite flocs flowing in a laminar shear flow
文献类型：期刊论文
| 作者 | Adachi, Yasuhisa; Di, Chuan; Xiao, Feng ; Kobayashi, Motoyoshi
|
| 刊名 | COLLOID AND POLYMER SCIENCE
 |
| 出版日期 | 2019-08-01 |
| 卷号 | 297期号:7-8页码:979-987 |
| 关键词 | Morphology of flocs Orientation Floc strength Na-montmorillonite Laminar shear flow Hydration force |
| ISSN号 | 0303-402X |
| 英文摘要 | The flowing behavior of montmorillonite flocs coagulated in NaCl solution was visualized using a device called Couette chamber which was designed to analyze the strength of floc against breakup in a laminar shear flow generated in the gap between two concentric cylinders. The rotation ax of cylinders was oriented horizontally to avoid the effect of sedimentation during measurement. Observation of the morphology of flowing flocs was performed with a high-speed camera under sufficiently high salt concentration to induce rapid coagulation of montmorillonite as a function of shear rate. The recorded image of flocs demonstrated that the average flowing flocs is approximated by an ellipsoid of equivalent inertial moment with a length ratio of two principal axes being around 2. The most probable orientation of the major axis was found to be the flow direction. Assuming flocs are ellipsoids and will be disrupted by the effect of extensional component of the flow field, the cohesive strength supporting the disintegrating clusters was calculated on the basis of the simple model of floc strength proposed previously for the breakup of a floc under turbulent flow. The tendency of structural enforcement by the rearrangement of internal clusters was recorded with an increase in size of floc irrespective of ionic strength. In addition, the enforcement of cohesive strength by the effect of dehydration of proximately adsorbed sodium ions at extremely high ionic strength was confirmed. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/42673]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 作者单位 | 1.Univ Tsukuba, Grad Sch Life & Environm Sci, Tennoudai 1-1, Tsukuba, Ibaraki 3058572, Japan 2.Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, 18 Shuangingking Rd, Beijing 100085, Peoples R China 3.North China Elect Power Univ, Sch Renewable Energy, Beinong Rd 2, Beijing 102206, Peoples R China |
| 推荐引用方式 GB/T 7714 | Adachi, Yasuhisa,Di, Chuan,Xiao, Feng,et al. Size, orientation, and strength of Na-montmorillonite flocs flowing in a laminar shear flow[J]. COLLOID AND POLYMER SCIENCE,2019,297(7-8):979-987. |
| APA | Adachi, Yasuhisa,Di, Chuan,Xiao, Feng,&Kobayashi, Motoyoshi.(2019).Size, orientation, and strength of Na-montmorillonite flocs flowing in a laminar shear flow.COLLOID AND POLYMER SCIENCE,297(7-8),979-987. |
| MLA | Adachi, Yasuhisa,et al."Size, orientation, and strength of Na-montmorillonite flocs flowing in a laminar shear flow".COLLOID AND POLYMER SCIENCE 297.7-8(2019):979-987. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。