Study of droplet flow in a T-shape microchannel with bottom wall fluctuation
Study of droplet flow in a T-shape microchannel with bottom wall fluctuation
复制标题
底壁波动的T型微通道内液滴流动研究
DOI：
10.1007/s10409-018-0750-7
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发表时间：
2018
影响因子：
3.5
通讯作者：
Zhaomiao Liu
中科院分区：
文献类型：
--
作者：
Yan Pang;Xiang Wang;Zhaomiao Liu
模拟了主通道宽度为50、侧通道宽度为25、高度为50的T型微通道中液滴的生成，研究了底壁强迫涨落对液滴生成的影响。在T形微通道中，在主通道的近结部分施加了底壁的周期性起伏。该协议的研究涵盖了底壁形状、波动周期和幅度对液滴产生的影响。在模拟中，液滴的平均尺寸受波动的影响较小，但受变形底壁形状的固定影响很大，而在大多数情况下，波动扩大了液滴的尺寸范围。当波动作用在T型结附近的底壁上时，液滴尺寸沿相对时间呈周期性的小幅度分布，而液滴的出现频率不受波动的影响。液滴速度受底壁运动的影响较大，特别是在较短的周期和较大的波幅下。当波动周期与液滴出现周期相似时，液滴的大小在流动开始的一个发展阶段后保持稳定，而液滴速度随运动壁面的变化而变化，在本研究条件下，变化幅度可达平均速度的80%。
Droplet generation in a T-shape microchannel, with a main channel width of 50, side channel width of 25, and height of 50, is simulated to study the effects of the forced fluctuation of the bottom wall. The periodic fluctuations of the bottom wall are applied on the near junction part of the main channel in the T-shape microchannel. Effects of bottom wall’s shape, fluctuation periods, and amplitudes on the droplet generation are covered in the research of this protocol. In the simulation, the average size is affected a little by the fluctuations, but significantly by the fixed shape of the deformed bottom wall, while the droplet size range is expanded by the fluctuations under most of the conditions. Droplet sizes are distributed in a periodic pattern with small amplitude along the relative time when the fluctuation is forced on the bottom wall near the T-junction, while the droplet emerging frequency is not varied by the fluctuation. The droplet velocity is varied by the bottom wall motion, especially under the shorter period and the larger amplitude. When the fluctuation period is similar to the droplet emerging period, the droplet size is as stable as the non-fluctuation case after a development stage at the beginning of flow, while the droplet velocity is varied by the moving wall with the scope up to 80% of the average velocity under the conditions of this investigation.