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標題: | 研究垂直旋轉式流變儀中不同濃度下泥流的運動型態與流變參數 A Study on the Motion and Rheological Parameters of Mud Flow in Rotating Viscometer |
作者: | Yi-An Ai 艾昱安 |
指導教授: | 劉格非(Ko-Fei Liu) |
關鍵字: | 高嶺土混合液,垂直旋轉式流變儀,賓漢流體,本構關係式,流變參數, Kaolin mixed with water,Rotating viscometer,Bingham,Constitutive model,Rheological parameter, |
出版年 : | 2009 |
學位: | 碩士 |
摘要: | 本文研究不同濃度的高嶺土加水在垂直旋轉式流變儀中的流動現象。使用固定量(9000ml左右)、不同濃度的高嶺土混合液進行實驗,過程中觀測並紀錄流體在流變儀中,在不同速度下的運動型態(包含非穩態),如穩定、擺盪、環狀。而理論部分則採用賓漢流體作為本構關係式,搭配張哲維(2008)所發展出的流變參數率定公式,將符合二維、穩態及長波理論假設下的運動型態進行參數檢定。
本實驗儀器的旋轉方向為順時針旋轉,所選用的濃度從最濃47.96%到最稀25.38%,共有8組。每組濃度都以不同的速度進行觀察,從3.51rpm到43.8rpm,共有12個速度。流動現象會隨不同的濃度及速度改變;一般而言,流體運動可分:上層逆時鐘朝下流動和下層底床順時鐘朝上兩層。自43.62%以後的濃度,由於黏滯力較強,在超過該濃度的臨界速度之前(表層流體的運動方向改變時,圓盤儀的旋轉速度),流體會順時針朝上穩定的運動,此時仍然滿足質量守恆。 In this study, we observe the motion of Kaolin mixed with water in the Rotating viscometer. The liquid of mixture in our experiment is constant volume (900ml) with various concentrations. The types of the motion of the liquid in different conditions, that is different rotating speeds and concentrations, in the viscometer include slipping, slumping, cataracting, and centrifuging. In theory, we use the result of K.F Liu and C.W Chang(2008), that is the calibration formula for steady and two-dimentional BIngham fluid, to calibrate the rheological parameters of mud flow. We set the rotational direction is clockwise. There are 8 different concentrations in our experiment, which range from 47.96% to 25.38%, with 12 different rotation speed (from 3.51rpm to 43.8rpm).Both the vary of concentration and speed affects the type of motion. Generally speaking, we got two types: the surface type and the bed type. The surface type is counter-clockwise and the bed type is clockwise. However, when the concentration exceeds 43.62% and under the critical speed, which is the rotational speed during the moving direction of the surface type was changed into another direction, the outcome of the experiments shows that types are both clockwise. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/8926 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 土木工程學系 |
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