Investigation of vertical velocity distribution in debris flows by PIV measurement

被引：11

作者：

Chen, Huayong ^{[1
,2
]}

Hu, Kaiheng ^{[1
,2
]}

Cui, Peng ^{[1
,2
,3
]}

Chen, Xiaoqing ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu, Sichuan, Peoples R China

[2] Univ Chinese Acad Sci, Beijing, Peoples R China

[3] CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China

来源：

GEOMATICS NATURAL HAZARDS & RISK | 2017年 / 8卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Vertical velocity distribution; debris flow; particle image velocimetry (PIV); flow viscosity; log-law model; INTERNAL VELOCITY; IMAGE VELOCIMETRY; CROSS-SECTIONS; STIRRED VESSEL; BEHAVIOR;

D O I：

10.1080/19475705.2017.1366955

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Vertical velocity distribution in some fluid-solid flows such as debris flows has not been well recognized and lacked a commonly accepted form. The particle image velocimetry (PIV) measurement system was employed to investigate the velocity distribution of high-viscosity fluid-solid flows. The velocity distribution was greatly affected by the particles due to the particle-particle collision and momentum exchange between the particle and fluid. Both of them show a similar increasing trend only in the range of the dimensionless flow depth from 0 to 0.7. In addition, based on the log-law model for sediment-laden flows, a modified model was proposed to predict vertical velocity distribution in debris flows. The results indicated that the calculated results were in good agreement with the experimental ones. The coefficient and index for the modified item was about 0.92 and -1/6, respectively.

引用

页码：1631 / 1642

页数：12

共 31 条

[1] Measurements of debris flow velocity through cross-correlation of instrumentation data [J].