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RISS 인기검색어
- 검색키워드
- 저자 : Zhaomiao Liu (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Dynamics of droplet breakup in unilateral Y-junctions with different angles
Zhaomiao Liu,Chenchen Zhang,Yan Pang,Wenchao Liu,Xiang Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Dynamic behaviors of droplets in asymmetric unilateral Y-junctions are experimentally studied. Threebreakup regimes are categorized, namely no breakup, breakup with gaps and breakup with obstruction,and regime diagrams are constructed by the capillary number and the normalized droplet length. Influences of the bifurcation angle and the viscosity ratio on the two critical conditions between neighboringregimes are revealed. In particular, necking processes in the obstructed breakup regime are discussedand they are divided into three stages according to the evolution of the thinning rate. At thetwo previous stages driven by the two-phase flow, the necking processes show distinct characteristicsunder the influences of four different parameters, including capillary number, droplet length, viscosityratio, and bifurcation angle, and the corresponding reasons are provided in detail. By contrast, the finalpinch-off stage is driven by two different mechanisms depending merely on the physical properties ofliquid systems. The neck collapsing of the low-viscosity droplet is driven by the potential flow while thatof the high-viscosity droplet is driven by the two-fluid Stokes flow. Quantitative relations between theminimum neck width and the remaining time are built in the two situations and are found to coincidewith the theoretical predictions, respectively.
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Breakup dynamics and scaling laws of liquid metal droplets formed in a cross junction
Zhaomiao Liu,Chenchen Zhang,Siyu Zhao,Yan Pang,Xiang Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
The formation of liquid metal droplets in a microfluidic cross junction with different viscosities of thecontinuous phase is experimentally and theoretically investigated. The flow pattern is distinguished intosqueezing and dripping by the presence of gaps. The differences in driving forces between the two patternsare analyzed theoretically and confirmed experimentally by Micro-PIV results. Roles of the squeezingforce and the shear force in droplet formation are varying due to the dynamic evolutions of the gapwidth which reduces with time. Therefore, critical values of the initial gap width are obtained which arethe outcome of the competition between neck thinning and tip growing. Compared to water–oil systems,gaps are more difficult to be formed due to the extremely high interfacial tension. Moreover, universalflow pattern maps are constructed using dimensionless parameters of Wed, Cac, and Rec, proving theimportant roles of both the squeezing force and the shear force. A scaling law of the droplet volume consideringthe influence of the viscosity ratio is proposed and a very good agreement between experimentaldata and theoretical predictions is obtained for different liquid systems.
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Collision characteristics of droplet pairs with the presence of arriving distance differences
Xiang Wang,Zhaomiao Liu,Yan Pang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
Four collision behaviors are observed for droplet pairs at a T-junction and phase diagrams are constructed by considering the arriving distance difference, the droplet length and the capillary number. Critical conditions for both coalescence and splitting are shown. The main coalescence regime is varied for asynchronous droplet pairs and the cause of the coalescence which occurs while two droplets are pulled apart is confirmed. Movements of the front caps of various droplet pairs are exhibited to show their different degrees of competitions to penetrate into the downstream channel and the advantage that favors coalescence is acquired by comparison.
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