| 鲍鲁威,张超,包福兵*.T型微通道内液滴生成过程中的压力研究[J].实验力学,2020,35(5):851~858 |
| T型微通道内液滴生成过程中的压力研究 |
| The pressure measurement of T-junction during droplet formation |
| 投稿时间：2019-08-31 修订日期：2019-09-17 |
| DOI：10.7520/1001-4888-19-153 |
| 中文关键词: 微流控 T型通道 液滴生成 压力 振动 |
| 英文关键词:microfluidic T-junction droplet formation pressure vibration |
| 基金项目:国家自然科学基金(11672284)；国家重点研发计划(2017YFB0603701) |
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| 中文摘要: |
| 微流控技术以其可控性好、样品消耗少和可以消除交叉污染等优点被广泛应用于材料合成、细胞工程和生物检测等诸多领域。文中通过实验研究了在低毛细管数下(Ca<0.01)T型微通道生成液滴时连续相、分散相和出口处压力随输入相流量的变化，同时讨论了外加管路振动对液滴生成的影响。根据实验结果，发现液滴的生成频率和通道各处压力均与输入流量呈良好的线性关系，确定了对于T型微通道能产生稳定液滴应满足的通道压力条件为分散相＞连续相＞出口处，明确通道出口处的平均能损与输入相流量相关，并得到当振动施加在分散相管路上时会引起该通道内与外加振动周期相同的压力波动，从而造成液滴界面的振动。 |
| 英文摘要: |
| Microfluidic technology has been widely used in many fields such as material synthesis, cell engineering and biological detection because of its good controllability, low sample consumption and elimination of cross-contamination. In this paper, all experiments are performed at low Capillary number (Ca＜0.01). The variation of pressure in each T-junction micro-channel during droplet formation under different input flow rates is investigated, and the effect of external piping vibration on droplet generation is analyzed. The results show that the frequency of droplet formation and the pressure in each channel have a good linear relationship with the input flow rate. And the channel pressure conditions that should be satisfied for the T-junction to steadily produce droplets are: pressures in dispersed phase > in continuous phase > at the outlet. Besides, the average energy per unit weight of fluid at the outlet channel is related to the input flow. Finally, the same pressure fluctuation of micro-channel can be formed due to the vibration on the pipeline of the dispersed phase, leading to the vibration of the droplet interface. |
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