摘要
本文通过试验和分析研究了非牛顿体明渠不稳定流的机理,阐明了不稳定流的产生和发展是由于流体具有屈服应力,利用这一机理,解释了高含沙洪水的波动和“浆河”现象、冰川流和泥流的不稳定流和泥石流的阵流现象。
, The mechanism of instability of non-Newtonian flow in an. open channel is studied by means of experiment and theoretical analysis. It is proved that the instability of non-Newtonian flow results essentially from the Bingham yield stress τB of the fluid. The larger the yield stress, is and the smaller the rigidity coefficient η is, the more unstable the non-New-t.onian flow will be. Based on the theory, the phenomena of 'river clogging' in hypercon-centrated flow in the Yellow River and its tributories, the intermittent flow and the 'paving way process' in highviscous debris flow, and the instability of glacial flow and mud flow are discussed in the paper.
出处
《力学学报》
EI
CSCD
北大核心
1990年第3期266-275,共10页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金
关键词
非牛顿
不稳定性
流体
浆河
Non-Newtonian flow, instability, bingham yield- stress, river clogging
