This study investigates the droplet formation for the liquid–liquid two-phase flow within a square T-junction microchannel through numerical simulation using volume of fluid method and experimental visualization usin...This study investigates the droplet formation for the liquid–liquid two-phase flow within a square T-junction microchannel through numerical simulation using volume of fluid method and experimental visualization using high-speed camera imaging.The T-junction microchannel has a cross-sectional width of 0.6 mm and a total length of 27.3 mm.The solution of cyclohexane with 2%and 3%mass concentrations of sorbitan trioleate surfactant were used as the continuous phase,and water was used as the dispersed phase.Slug flow,characteristic of squeezing regime,were predominantly observed.The effects of liquid–liquid two-phase flow rate ratio,and dimensionless number on droplet size,and pressure drop were investigated.The squeezing regime was mapped for 0.0005≤Ca_(c)≤0.0052(capillary number)and 0.1≤q≤10(flow rate ratio).The pressure drops of slugs were in the range from 40 Pa to 200 Pa.The slug lengths were measured between 1 mm and 9 mm.A universal flow map dependent on Ca_(c)Re_(d)^(0.5) are projected to investigate the droplet formation behavior in T-junction microchannel.Correlation expressions are proposed to predict pressure drops and the slug lengths for liquid–liquid two-phase flow in a square T-junction microchannel,using dimensionless numbers such as flow rate ratio and capillary number.The result shows that large continuous phase flow rates facilitate smaller slugs,whereas higher dispersed phase flow rates result in longer shorts.展开更多
受限空间的气泡浮升过程因其特殊的流体动力学行为而受到广泛关注。利用Hele-Shaw实验装置,以该装置的狭缝宽度为受限空间的受限尺度,通过实验研究受限尺度的变化对受限空间的浮升气泡流体动力学行为的影响。实验分别测量了在0.5、1.0、...受限空间的气泡浮升过程因其特殊的流体动力学行为而受到广泛关注。利用Hele-Shaw实验装置,以该装置的狭缝宽度为受限空间的受限尺度,通过实验研究受限尺度的变化对受限空间的浮升气泡流体动力学行为的影响。实验分别测量了在0.5、1.0、1.5和2.0 mm 4个狭缝宽度下的CO_(2)气泡在水中运动过程的流体动力学参数,分别分析了气泡尺寸大小和狭缝宽度对受限空间内气泡动力学参数的影响,定量地展示了气泡的多种流体动力学参数随狭缝宽度的变化关系。展开更多
基金supports for this project from the National Natural Science Foundation of China(22378295).
文摘This study investigates the droplet formation for the liquid–liquid two-phase flow within a square T-junction microchannel through numerical simulation using volume of fluid method and experimental visualization using high-speed camera imaging.The T-junction microchannel has a cross-sectional width of 0.6 mm and a total length of 27.3 mm.The solution of cyclohexane with 2%and 3%mass concentrations of sorbitan trioleate surfactant were used as the continuous phase,and water was used as the dispersed phase.Slug flow,characteristic of squeezing regime,were predominantly observed.The effects of liquid–liquid two-phase flow rate ratio,and dimensionless number on droplet size,and pressure drop were investigated.The squeezing regime was mapped for 0.0005≤Ca_(c)≤0.0052(capillary number)and 0.1≤q≤10(flow rate ratio).The pressure drops of slugs were in the range from 40 Pa to 200 Pa.The slug lengths were measured between 1 mm and 9 mm.A universal flow map dependent on Ca_(c)Re_(d)^(0.5) are projected to investigate the droplet formation behavior in T-junction microchannel.Correlation expressions are proposed to predict pressure drops and the slug lengths for liquid–liquid two-phase flow in a square T-junction microchannel,using dimensionless numbers such as flow rate ratio and capillary number.The result shows that large continuous phase flow rates facilitate smaller slugs,whereas higher dispersed phase flow rates result in longer shorts.
文摘受限空间的气泡浮升过程因其特殊的流体动力学行为而受到广泛关注。利用Hele-Shaw实验装置,以该装置的狭缝宽度为受限空间的受限尺度,通过实验研究受限尺度的变化对受限空间的浮升气泡流体动力学行为的影响。实验分别测量了在0.5、1.0、1.5和2.0 mm 4个狭缝宽度下的CO_(2)气泡在水中运动过程的流体动力学参数,分别分析了气泡尺寸大小和狭缝宽度对受限空间内气泡动力学参数的影响,定量地展示了气泡的多种流体动力学参数随狭缝宽度的变化关系。
