摘要高粘度液体真空脱泡，是要求在真空环境下对用在不能存在气泡的场合的高粘度 液体进行脱泡。目前在冶金、石油、纺织和化工等工程领域运用的很广阔。真空脱泡 主要是依靠真空环境下气泡在液体中膨胀上升而破裂，对于真空环境密封性的要求非 常严格。但对如何加快真空脱泡速度研究较少，特别是对气泡破裂在高粘度液体中产 生的力与破坏研究甚少。84956

本次毕业设计主要研究内容包括： 1）改变容器里面压力的实验，研究不同压力环境下液体的脱泡效果。 实验表明，随着容器压力不断的降低，粘度液体的脱泡性能越来越好，在真空环境下达到最强。

2）将容器环境保持在真空下，改变液体粘度分析液体脱泡效果和气泡半径变化， 验证低粘度液体的脱泡效果高于高粘度液体的脱泡效果。

实验表明，粘度越低，液体在真空环境下气泡的半径变化越大。 3）改变液体温度，观察液体脱泡速度的快慢。 实验表明，增加液体温度可以使高粘度液体降低粘度，从而降低液体阻滞性，进而加强了液体的脱泡性能。 4）实验观察气泡在真空环境下的半径随时间的变化。 通过实验，直观的观察到液体表面的气泡逐渐变大直至破裂的过程。 5）实验观察气泡的上升过程及气泡上升速度随时间的变化。

实验表明，气泡从底部上升到临近液体表面的速度很大，在液面下析出的速度会 变慢。

6）对气泡破裂产生的能量进行实验，观察气泡破裂产生的破坏，观察不同半径 破裂对悬臂梁产生位移的状态图，通过计算得出气泡破裂产生的力和能量。

实验表明，气泡半径越大，气泡破裂产生的能量越大；相同半径下，气泡粘度越 大，气泡破裂能量越大。

本课题对提高液体的脱泡速度，增强真空脱泡的实际应用具有现实意义。

毕业论文关键字：高粘度液体；真空脱泡；真空环境；气泡；破裂

Abstract High viscosity liquid vacuum deaeration is in vacuum environment of in cannot exist bubble occasions of high viscosity liquid deaeration。 At present, it is widely used in metallurgy, petroleum, textile, chemical engineering and other engineering fields。 Vacuum deaeration is mainly rely on vacuum bubbles in the liquid rising and swelling and rupture for vacuum sealing of the requirements are very strict。 But on how to speed up the vacuum defoaming rate of less, especially on the bubble breakdown in high viscosity liquids produced by force and failure of a little。

The main research contents of this graduation project include:

1)change the container pressure experiment, defoaming effect of liquid under different pressures。

Experiments show that with decrease of pressure vessel continuously, viscosity liquid deaeration performance is getting better and better, in the vacuum environment reaches the maximum。

2)will container environment keep under vacuum, change the liquid viscosity of liquid defoaming effect and the bubble radius changes, verification of low viscosity liquid defoaming effect is higher than that of the high viscosity liquid defoaming effect。

The experimental results show that the lower the viscosity, the greater the radius of the bubble in the vacuum environment。

3)to change the temperature of the liquid, observe the liquid defoaming speed。

Experiments show that increase the temperature of the liquid can make high viscosity liquid viscosity is reduced, thereby reducing the liquid block, thereby strengthening the defoaming performance liquid。

4)the change of the radius of the bubble in vacuum environment with time。

Through experiments, it is observed that the bubbles in the liquid surface gradually become larger and larger until the rupture process。