泡沫运动模拟与印花色浆泡沫的稳定性试验

Foam motion modeling simulation and stability experiments of printing paste foam

针对泡沫印花所用泡沫稳定性差的问题,使用流体体积法(VOF)和连续表面力(CSF)模型对泡沫运动过程进行模拟,结合试验共同探讨表面张力、液相黏度、气泡间距、气泡直径差对稳定性的影响。结果表明:降低表面张力更有利于在气泡上升过程中维持气泡形状,减少气体扩散,同时能够在试验条件下得到更高的发泡体积;提高液相黏度能够减弱气泡上升过程中的速度,提高泡沫的稳定性;当气泡间距较小时气泡会发生兼并,汇聚成大气泡,缩小气泡直径差距和增大气泡间距能够减弱气泡兼并进程,提高稳定性;使用较高黏度的发泡液制备的泡沫均匀度更高、气泡运动更弱,具有较高的整体稳定性。

In response to stability concerns in foam printing,the fluid volume method(VOF)and continuous surface force(CSF)model were used to simulate the foam movement process,and the influence of surface tension,liquid viscosity,bubble spacing and bubble diameter difference on the stability was discussed.The results show that reducing the surface tension is more conducive to maintaining the bubble shape during the bubble rise,reducing the gas diffusion,and obtaining a higher foam volume under the test conditions.Increasing the viscosity of liquid phase can reduce the speed of bubble rise and improve the stability of foam.When the bubble spacing is small,bubbles will merge and converge into large bubbles.Reducing the bubble diameter gap and increasing the bubble spacing can weaken the bubble merging process and improve the stability.The foam prepared by the foaming solution with higher viscosity has higher uniformity,weaker bubble movement and higher overall stability.