應用直立旋轉式水槽研究土石流體之流動現象

Application of a Vertically Rotating Flume to Study the Flow Behavior of Sediments

詹錢登(Chyan-Deng Jan) ； 陳晉琪(Jinn-Chyi Chen)

《中華水土保持學報》 28卷2期 (1997/06) Pp. 157-164

https://doi.org/10.29417/JCSWC.199706_28(2).0008

摘要

本文研究直立旋轉式水槽內，泥砂顆粒在水槽轉動時之流動現象，以及泥砂顆粒流動時所受之剪力。藉由實驗的觀測，探討泥砂顆粒在水槽內滑動、擺盪及滾動等流動形態，並由力矩及力平衡觀念，推求底床剪切力與泥砂密度、水槽外徑、底床坡角及土石流體剖面形狀之關係式。當泥砂密度、水槽外徑及底床坡角給定時，配合攝影機拍攝所讀取之剖面形狀，將可由此關係式推算剪切力，並進而分析底床剪切力與福祿數及剪切率之關係。

關鍵字

土石流體 ； 直立旋轉式水槽 ； 底床剪切力 ； 剪切率

並列摘要

This work presents experimental observations on flow behaviors of sediments in a vertically rotating flume. The flow behaviors of seiliments in the flume varied with the angular velocity of the flume and could be classified into three types: sliding, slumping and rolling movements. The dependence of bottom shear stress on the factors, e. g. density of sediments, the flume's outer radius, the bottom slope and the surface profile of sediments in the rotating flume was theoretically developed. As the above mentioned factors are given, one can assess the bottom shear stress. According to experimental data, the relations of the bottom shear stress and the shear rate as well as the Froude number was assessed.

並列關鍵字

Sediment mixture ； Vertically Rotating Flume ； Bottom Shear Stress ； Shear Rate