关于落体法测蓖麻油黏度实验中的预留高度问题  

On the reserved height in the experiment of castor oil viscosity using falling body method

作　　者：王晓凯[1] 韩秋菊[1] 彭艳辉[1] 白士刚[1] 刘勇[1] 赵宏伟[1] 李楠[1] 

机构地区：[1]东北农业大学理学院,黑龙江哈尔滨150030

出　　处：《物理实验》2008年第7期36-39,共4页Physics Experimentation

基　　金：东北农业大学教务处资金资助

摘　　要：采用高速摄像机跟踪小钢球下落全程,找出匀速运动的起始位置并测量速度.为方便学生使用简单量具就能较准确地测量蓖麻油的黏度,给出了较准确的预留高度hT.还分析了小钢球在黏性流体中运动时的受力情况,给出球受力的表达式.并应用Mathematics软件对受力表达式求数值解,画出v-h图,与实测的v-h曲线对比基本吻合.Using high-speed camera to record the falling process of the ball, the starting point of uniform motion is found out and the velocity of the ball is measured. The reserve height hT is got accurately in order that the students can measure the viscosity of the castor oil conveniently. The force exerting on the small steel ball in the oil is analyzed in detail and an analytical expression is given. The software of Mathematica is apPlied to numerically calculate the force and draw the v-h curve, and the theoretical curve in accordance with that obtained in the experiment.

关 键 词：黏度 预留高度 高速摄像 受力分析 

分 类 号：O351.2[理学—流体力学]