﻿ 分离夹层有水玻璃所需较大拉力的产生原理与影响因素 Formation Principle and Influence Factors of the Force Required to Separate Two Sheets of Glass with a Thin Layer of Water between Them

Applied Physics
Vol.07 No.04(2017), Article ID:20241,7 pages
10.12677/APP.2017.74012

Formation Principle and Influence Factors of the Force Required to Separate Two Sheets of Glass with a Thin Layer of Water between Them

Xinyang Su, Fang Lin*

Collegeof Physical Science and Technology, Sichuan University, Chengdu Sichuan

Received: Apr. 6th, 2017; accepted: Apr. 18th, 2017; published: Apr. 24th, 2017

ABSTRACT

Put a thin layer of water between two sheets of glass and try to separate them, it could be found that the force required was much larger than the one when the water layer did not exist. Based on the effect of atmosphere and surface tension, the formula for the pulling force required was derived and obtained, which has come to a conclusion that the force would mainly depend on the surface tension coefficient between water and glass, the area of water layer, and the curvatures of the water layer’s edge. Furthermore, experiments were executed to verify the correctness of theory and investigate the influence of the volume of water as well as the glass material.

Keywords:Glasses with a Layer of Water, Separation, Surface Tension, Pressure Difference

1. 引言

2. 理论分析

Figure 1. Schematic diagram of the system studied and force analysis of the upper glass

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(2)

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(6)

；逐渐施加拉力，由平衡方程(6)可知竖直曲率半径逐渐减小，即边缘液面从外凸逐渐内凹，曲率半径将从减小为负无穷(此时，边缘液面呈竖直平面)，再从正无穷减小为(此时边

3. 实验探究

3.1. 验证水铺满玻璃夹层时的最小分离拉力公式

1) 使用胶头滴管往下层玻璃片表面加足量的水，将安装有挂钩的上层玻璃片轻放于水面上；

2) 将质量为1.67 kg的重物置于玻璃片上，持续20秒，从而使夹层内气泡尽可能地排出，玻璃片和水层尽可能地相互贴紧；

3) 用纸巾轻轻地将玻璃夹层以外的水吸干，使水刚好铺满整个玻璃夹层；

4) 移除重物，用电子测力计连接挂钩，在竖直方向上逐渐增大拉力直到玻璃片被拉开，此时电子测力计将记录该过程的最大拉力，及分离玻璃片所需拉力。

3.2. 夹层水量对分离拉力的影响

Figure 2. When water fully covered the interlayer, the separation force was proportional to the area of glass

3.3. 初始施压对分离拉力的影响

Figure 3. The relationship between the separation force and the amount of water in glass interlayer

Figure 4. The relationship between separation force and the initial pressure on the upper glass

3.4. 玻璃材质对分离拉力的影响

Table 1. The relationship between separation force and glass material

4. 总结

Formation Principle and Influence Factors of the Force Required to Separate Two Sheets of Glass with a Thin Layer of Water between Them[J]. 应用物理, 2017, 07(04): 85-91. http://dx.doi.org/10.12677/APP.2017.74012

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*通讯作者。