利用磁力搅拌器探究磁悬浮现象  

Investigate on magnetic levitation phenomenon by magnetic stirrer

作　　者：刘梦妮 张杨林 晏志远 孙美满 范婷 LIU Meng-ni;ZHANG Yang-lin;YAN Zhi-yuan;SUN Mei-man;FAN Ting(College of Physics,Shihezi University,Shihezi,Xinjiang 832003,China;College of Public Security Information Technology and Intelligence,Criminal Investigation Police university,Shenyang,Liaoning 110854,China)

机构地区：[1]石河子大学理学院,新疆石河子832003 [2]中国刑事警察学院公安信息技术与情报学院,辽宁沈阳110854

出　　处：《大学物理》2021年第9期63-67,共5页College Physics

基　　金：教育部高等学校大学物理课程教指委教学研究立项项目(DJZW202014xb);石河子大学通识教育选修课重点项目(TXKZ2020-7)资助。

摘　　要：磁力搅拌器中的搅拌子在具有黏性的流体中随磁力搅拌器转速的改变能实现稳定上升和悬浮.本文利用动力学方程对磁悬浮现象中搅拌子的运动规律进行了理论分析,通过控制变量对影响稳定悬浮的参量进行了实验探究.实验和理论结果一致表明:流体黏度越大,搅拌子悬浮高度越低;随着磁力搅拌器驱动转速增大,搅拌子摆动角速度ωw加强,转动角速度ωs减弱,悬浮高度降低;较小的搅拌子更容易稳定在中心,直径小的烧杯容易提供初始的稳定态;当搅拌子初始距底高度z b固定,驱动转速越大,或当驱动转速固定,搅拌子z b高度越高,对应的摆动振幅都越小.The flea in the magnetic stirrer can steadily rise and suspend in the viscous fluid with the change of the speed of magnetic stirrer.The motion of the flea in magnetic levitation is analyzed theoretically by means of dynamical equation,and the parameters affecting the stable levitation are investigated experimentally by means of variable controlling.The experimental and theoretical results show that the higher the fluid viscosity coefficient,the lower the suspension height of the flea.As the driving speed of magnetic stirrer increasing,the flea oscillation angular velocityωw strengthened,rotation angular velocityωs weakens,suspension height decreases;Smaller flea tended to be more stable in the center,and smaller beakers tended to provide an initial stable state.When the initial height z b from the bottom of the flea is fixed,the higher the driving speed,or when the driving speed is fixed,the higher the initial height z b from the bottom of the flea,the smaller the corresponding swing amplitude.

关 键 词：磁力搅拌器 粘性流体 动态稳定 IYPT 

分 类 号：O441.2[理学—电磁学]