置于冷瓶口硬币的弹起现象研究
收稿日期: 2019-04-11
修回日期: 2019-06-03
网络出版日期: 2020-01-22
基金资助
教育部高等学校教学研究项目( DWJZW201705xb) ; 西安交通大学本科教学改革研究基础课专题( 1802Z-04) ; 西安交通大学本科教学改革研究项目( 17ZX05，1803Z) 资助
Research on the jumping coin placed on cooled bottle neck
Received date: 2019-04-11
Revised date: 2019-06-03
Online published: 2020-01-22
本文研究了将硬币置于冷却的瓶子瓶口，放置于相对高温环境中，硬币发生多次弹起的现象.本文利用零维非稳态传热学方程描述了瓶内气体温度的变化，通过力矩分析得到了硬币弹起的条件，并采用MATLAB 数值模拟研究了硬币多次弹起时压强和弹起周期随时间的变化规律.并通过不同材质的瓶子和不同的硬币研究了对该弹起现象的影响，实验得到了和理论一致的结果.
关键词： 热力学; 零维非稳态传热学方程; 硬币弹起; 冷瓶
庆秉承, 刘萍, 袁识博, 孔春才, 方爱平, 田蓬勃, 李宏荣, 高宏, 王小力 . 置于冷瓶口硬币的弹起现象研究[J]. 大学物理, 2019 , 38(12) : 52 . DOI: 10.16854 /j.cnki.1000-0712.190167
In this paper，we study the phenomenon that the coin placed on a cooled bottle neck will jump for several times when placing them in a relatively high temperature. The zero-dimensional transient heat transferring equation is used to describe the change of air temperature in the bottle. The condition for the jumping of coin is obtained from the force moment analysis. And MATLAB numerical simulation is used to study the change of air pressure in bottle and period of jumping. Then，the effects of the phenomenon are studied through different kinds of bottles and of coins，which obtain the same results as the theoretical analysis.
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