Collective and individual motions of particulate dispersion with concentration interface

颗粒分散体与浓度界面的集体和个体运动

• 批准号: 23560178
• 负责人: HARADA Shusaku
• 金额: $ 3.41万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23560178/
• 关键词: 混相流; 微粒子分散系; 沈降; 微粒子; 微粒子懸濁液; 流体工学

Collective motion of fine particles in liquid can be widely seen in engineering processes such as water treatment or sediment transport. We have studied whether collective or individual settling motion of particles reveals in liquid. The results showed that the concentration interface which is an ambiguous interface between suspended particles and pure fluid plays a significant role in these extreme behaviors. In cases of small particle size with high concentration, the interfacial instability occurs at the lower concentration interface and consequently the settling velocity is much faster than that of an isolated particle. On the other hand, in case of large particles with low concentration, the concentration interface is less distinct and the suspended particles settle individually. We showed that the transition from these collective to individual motions of suspended particles can be controlled by the border resolution of concentration interface.

液体中细颗粒的集体运动在水处理、泥沙输运等工程过程中广泛存在。研究了液体中颗粒的沉降运动是集体沉降还是个体沉降。结果表明，浓度界面是悬浮颗粒和纯流体之间的一个模糊界面，在这些极端行为中起着重要作用。在高浓度的小颗粒尺寸的情况下，界面不稳定性发生在较低浓度界面处，因此沉降速度比孤立颗粒的沉降速度快得多。另一方面，在具有低浓度的大颗粒的情况下，浓度界面不太明显，并且悬浮颗粒单独沉降。我们发现，从这些集体的悬浮颗粒的运动到个人的过渡可以控制的浓度界面的边界分辨率。

项目成果

Fluid Permeability in Stratified Unconsolidated Particulate Bed

• DOI: 10.1007/s11242-012-0098-6
• 发表时间: 2013-02-01
• 期刊: TRANSPORT IN POROUS MEDIA
• 影响因子: 2.7
• 作者: Otomo, Ryoko;Harada, Shusaku
• 通讯作者: Harada, Shusaku

多分散粒子層中の透過流動における成層度の影響

分层程度对多分散颗粒层渗透流量的影响

• 发表时间: 2012
• 作者: 大友涼子;原田周作
• 通讯作者: 原田周作

懸濁液における濃度界面のふるまいに関するシミュレーション

悬浮液中浓度界面行为的模拟

• 发表时间: 2013
• 作者: 村上敬;乾晴行;内島大地，香取丈寛，平木祐哉，酒井利奈，馬渕清資;久高文也,城後健二,山本恭史,原田周作
• 通讯作者: 久高文也,城後健二,山本恭史,原田周作

微粒子分散系の集団的挙動と個別的挙動

细颗粒分散系统的集体行为和个体行为

• 发表时间: 2012
• 作者: Tanaka K;Sakai R;Mabuchi K;原田周作
• 通讯作者: 原田周作

Non-Invasive Measurement of Concentration Field on Mass Transfer in Porous Media

多孔介质传质浓度场的非侵入式测量

• 发表时间: 2013
• 作者: Tanikoshi;T.;Otomo;R.;Ishii;N. and Harada;S.
• 通讯作者: S.