T型微通道入口角度对剪切变稀流体微液滴制备影响
Effects of T-junction microchannel entrance angles on the preparation of shear-thinning fluid microdroplets
邢雷 1綦航 2蒋明虎 3张爽 3韩国鑫 4关帅3
作者信息
- 1. 东北石油大学 机械科学与工程学院,黑龙江 大庆 163318;黑龙江省石油石化多相介质处理及污染防治重点实验室,黑龙江 大庆 163318;大庆油田博士后科研工作站,黑龙江 大庆 163458
- 2. 东北石油大学 机械科学与工程学院,黑龙江 大庆 163318
- 3. 东北石油大学 机械科学与工程学院,黑龙江 大庆 163318;黑龙江省石油石化多相介质处理及污染防治重点实验室,黑龙江 大庆 163318
- 4. 大庆油田采油十厂,黑龙江 大庆 166405
- 折叠
摘要
为了研究 T 型微通道入口角度对非牛顿微液滴制备影响,采用流体体积(VOF)模型对聚丙烯酰胺水溶液微液滴形成过程进行数值模拟,开展高速数码显微实验对数值模拟结果进行验证.结果表明:在相同工况条件下,非牛顿微液滴生成频率随着分散相入口角度的增大呈先增大后减小的趋势,相对长度呈现先减小后增大的趋势.在入口角度小于 90°时,随着入口角度的增加,微通道内两相平均压差、液滴断裂时刻两相压差最低值随之升高,在入口角度大于 90°时,上述压差则随着入口角度的增加而降低.考虑两相体积流量比与连续相毛细数并引入关于分散相入口角度的修正系数,提出聚丙烯酰胺水溶液微液滴相对长度预测公式,为剪切变稀流体微液滴制备提供参考.
Abstract
In order to study the effect of T-junction microchannel entrance angle on the preparation of non-Newtonian microdroplets,the fluid volume model was used to simulate microdroplet formation processes of polyacrylamide aqueous solution,and the accuracy of the numerical simulation results was verified by high-speed digital microscopic experiments.The results show that under the same operating conditions,the frequency of non-Newtonian microdroplet generation tends to increase and then decrease with the increase of dispersed phase inlet angles,while the relative length tends to decrease and then increase.When the inlet angle was less than 90°,the average pressure difference between the two phases in the microchannel and the lowest pressure difference at the time of droplet breakup increased with the increase of the inlet angle,and the above pressure difference decreased with the increase of the inlet angle when the inlet angle was higher than 90°.A formula for predicting the relative length of microdroplets of polyacrylamide aqueous solution was proposed considering two-phase flow ratios and the continuous phase capillary numbers,together with the correction coefficient of dispersed phase inlet angles,which provides reference for the preparation of shear-thinning fluid droplets.
关键词
微通道/非牛顿流体/入口角度/毛细数/微液滴Key words
microchannel/non-Newtonian fluid/inlet angle/capillary number/microdroplets引用本文复制引用
基金项目
国家自然科学基金区域创新发展联合基金重点支持项目(U21A20104)
国家自然科学基金(52304064)
黑龙江省自然科学基金(LH2022E017)
中国博士后科学基金(2023M730481)
黑龙江省博士后资助项目(LBH-Z23039)
出版年
2024
国家科技期刊平台
NSTL
万方数据