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学者姓名：刘赵淼
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Abstract ：
The transportation behaviors and dynamic characteristics of double emulsion droplets in a Y-junction are experimentally investigated to explore the influence of the interfacial tension. Based on the breakup behaviors, three flow patterns are identified: non-breakup (NB), once breakup of the outer droplet (OB), and twice breakup of the outer droplet (TB). Compared to the single emulsions, the inner droplet leads to new flow patterns for the double emulsions due to the coupling effect between interfaces. The flow pattern map can be built using the normalized droplet length and the capillary number. With the aid of the quantitative expression of the transition thresholds using a power law relation, the transitions are further found to rely on the junction structure and the physical properties of the double emulsion. It is indicated that the dynamic characteristics of double emulsions are shaped jointly by multiple controlling parameters, such as the droplet length, the capillary number, and the junction structure. A force model is proposed to estimate the quantitative evolutions of the working forces in different flow patterns. The evolution of the droplet morphology is consistent with the forces acting on it, and the prerequisite condition for the droplet breakup is confirmed to depend on the competition between the sum of the driving forces and the sum of the interfacial tensions. The variation of the transition thresholds in different liquid systems is further analyzed, which may provide useful methods to manipulate the double emulsions by changing the physical properties.
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| GB/T 7714 | Wang, Xiang , Sun, Chao , Su, Peng et al. Transportation behaviors of double emulsion droplets under the influence of varied interfacial tensions [J]. | PHYSICS OF FLUIDS , 2025 , 37 (2) . |
| MLA | Wang, Xiang et al. "Transportation behaviors of double emulsion droplets under the influence of varied interfacial tensions" . | PHYSICS OF FLUIDS 37 . 2 (2025) . |
| APA | Wang, Xiang , Sun, Chao , Su, Peng , Pang, Yan , Liu, Zhaomiao . Transportation behaviors of double emulsion droplets under the influence of varied interfacial tensions . | PHYSICS OF FLUIDS , 2025 , 37 (2) . |
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Abstract ：
Conductive hydrogels based on liquid metal microdroplets are widely used as wearable electronic devices. Droplet uniformity affects sensor sensitivity for weak signals, such as heart rate and pulse rate. Surface acoustic waves at micrometer wavelengths allow precise control of a single droplet, and have the potential to make uniformly discrete liquid metal droplets and distribute them in hydrogels. But the control law of liquid metal droplet size and its spatial configuration by acoustic surface waves is not clear. The aim of this paper is to present an analysis of the acoustic regulation mechanism in the interfacial evolution of fluids with high interfacial tension coefficients, and to investigate the influence of microdroplet generation characteristics (size and spacing) on the conductive and mechanical properties of conductive hydrogels. The results showed that the combined action of acoustic radiation force, shear force and pressure difference force helped to overcome interfacial tension and speed up the interfacial necking process during the filling and squeezing stages. The use of acoustic surface waves serves to diminish the influence of droplet size on the two-phase flow rate. This provides an effective approach for achieving decoupled control of microdroplet size and spacing, alongside the formation of a homogenous array of liquid metal droplets. The acoustic surface wave effect makes the liquid metal microdroplets more uniform in size and spacing. As the liquid metal content relative to the hydrogel substrate solution increases, the liquid metal size decreases. The hydrogel's initial conductivity and conductivity after self-healing increase by 10% and 25%, respectively, which can realize the effective monitoring of ECG and EMG signals. This study helps to reveal the evolution mechanism of liquid-metal interfaces induced by acoustic surface waves, elucidate the effects of microdroplet size and spacing on the conductive and mechanical properties of hydrogels, and provide theoretical guidance for the high-precision preparation of wearable electronic devices.
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| GB/T 7714 | Zhao, Siyu , Liu, Zhaomiao , Zheng, Nan et al. Study on the size and spatial configuration of liquid metal droplets in conductive hydrogels induced by surface acoustic waves [J]. | LAB ON A CHIP , 2025 . |
| MLA | Zhao, Siyu et al. "Study on the size and spatial configuration of liquid metal droplets in conductive hydrogels induced by surface acoustic waves" . | LAB ON A CHIP (2025) . |
| APA | Zhao, Siyu , Liu, Zhaomiao , Zheng, Nan , Zhang, Chenchen , Zheng, Kai , Shi, Shuai et al. Study on the size and spatial configuration of liquid metal droplets in conductive hydrogels induced by surface acoustic waves . | LAB ON A CHIP , 2025 . |
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Abstract ：
Inertial microfluidic technology has emerged as a highly promising approach for the separation of particles/cells, characterized by high throughput and label-free features. This study presents a novel inertial microfluidic chip design that enables the continuous separation of target particles at low Reynolds numbers (Re <= 36). To enhance its sorting performance, the influences of Reynolds numbers (Re = 3.7-60), particle sizes (d = 10 and 20 mu m), and outlet flow rates on the particle separation efficiency and purity are further examined, and a phase diagram of the optimal working conditions is obtained. The evolution of the flow field structure within the microfluidic chip is comprehensively analyzed, which can be divided into three distinct regions, namely, the main flow, sheath flow, and vortex. The mechanism of particle migration behavior across curved streamlines is further explored. This device can achieve a maximum separation efficiency of 94% for target large particles (d = 20 mu m), with a fivefold increase in the enrichment concentration, a 31.3-fold increase in purity, and a removal efficiency of small particles reaching 97.1%. The results demonstrate that this device can facilitate the continuous and direct separation of target larger particles based on their size, presenting numerous advantages, such as a short microchannel length, low Reynolds number, minimal cell damage, and ease of operation. Hence, this method represents an easy-to-use and straightforward approach for microfluidic sorting techniques and is anticipated to have practical application in the sorting of rare circulating tumor cells from complex cell solutions.
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| GB/T 7714 | Shen, Feng , Zhang, Jie , Zhang, Chenchen et al. Continuous and straightforward sorting of particles in microcavities with side outlets using inertial microfluidics [J]. | PHYSICS OF FLUIDS , 2025 , 37 (3) . |
| MLA | Shen, Feng et al. "Continuous and straightforward sorting of particles in microcavities with side outlets using inertial microfluidics" . | PHYSICS OF FLUIDS 37 . 3 (2025) . |
| APA | Shen, Feng , Zhang, Jie , Zhang, Chenchen , Zhao, Siyu , Liu, Zhaomiao . Continuous and straightforward sorting of particles in microcavities with side outlets using inertial microfluidics . | PHYSICS OF FLUIDS , 2025 , 37 (3) . |
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In this work, merged and alternating droplets generated in a microfluidic double T-junction are investigated using experiments and numerical simulations. The double T-junction is constructed by symmetrically inserting two capillaries into a microfluidic chip at specific positions. We explore the effects of the two-phase flow rate fraction, capillary tip distance (30 mu m, 60 mu m, and 200 mu m), and fluid properties on droplet formation phenomena. Detailed observations reveal four distinct regimes during the dynamic evolution of the two-phase interface morphology: merged state, stable alternating droplets, droplet pairs, and jetting. Two phase diagrams are obtained to demonstrate that interfacial tension and dispersed phase viscosity significantly influence these regimes. Moreover, we find that as the flow rate fraction increases from 0.054 to 0.286, the length of generated droplets increases from 156 to 789 mu m; we provide a theoretical prediction formula for dimensionless droplet length accordingly. Additionally, our simulations show fluctuating pressure in dispersed flows throughout the process of droplet generation. The simulated pressure in the dispersed flows fluctuates during the droplet generation process. The understanding of the underlying physics of the capillary-based double T-junction contributes valuable insights for various related applications.
Keyword ：
Merged and alternating droplets Merged and alternating droplets Double T-junction Double T-junction Inserted capillary Inserted capillary Microfluidics Microfluidics Droplet microfluidics Droplet microfluidics
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| GB/T 7714 | Shen, Feng , Zhang, Yuedong , Li, Chunyou et al. Merged and alternating droplets generation in double T-junction microchannels using symmetrically inserted capillaries [J]. | MICROFLUIDICS AND NANOFLUIDICS , 2024 , 28 (5) . |
| MLA | Shen, Feng et al. "Merged and alternating droplets generation in double T-junction microchannels using symmetrically inserted capillaries" . | MICROFLUIDICS AND NANOFLUIDICS 28 . 5 (2024) . |
| APA | Shen, Feng , Zhang, Yuedong , Li, Chunyou , Pang, Yan , Liu, Zhaomiao . Merged and alternating droplets generation in double T-junction microchannels using symmetrically inserted capillaries . | MICROFLUIDICS AND NANOFLUIDICS , 2024 , 28 (5) . |
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Abstract ：
Microfluidics or lab-on-a-chip technology has shown great potential for the separation of target particles/cells from heterogeneous solutions. Among current separation methods, vortex sorting of particles/cells in microcavities is a highly effective method for trapping and isolating rare target cells, such as circulating tumor cells, from flowing samples. By utilizing fluid forces and inertial particle effects, this passive method offers advantages such as label-free operation, high throughput, and high concentration. This paper reviews the fundamental research on the mechanisms of focusing, trapping, and holding of particles in this method, designs of novel microcavities, as well as its applications. We also summarize the challenges and prospects of this technique with the hope to promote its applications in medical and biological research.
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| GB/T 7714 | Shen, Feng , Gao, Jie , Zhang, Jie et al. Vortex sorting of rare particles/cells in microcavities: A review [J]. | BIOMICROFLUIDICS , 2024 , 18 (2) . |
| MLA | Shen, Feng et al. "Vortex sorting of rare particles/cells in microcavities: A review" . | BIOMICROFLUIDICS 18 . 2 (2024) . |
| APA | Shen, Feng , Gao, Jie , Zhang, Jie , Ai, Mingzhu , Gao, Hongkai , Liu, Zhaomiao . Vortex sorting of rare particles/cells in microcavities: A review . | BIOMICROFLUIDICS , 2024 , 18 (2) . |
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Abstract ：
The controlled motion of droplets in microfluidic chips is a preliminary requirement to realize their functions. The influence of the expansion section on the droplet motion is mainly investigated in the T-junction. The droplet dynamic characteristics are analyzed at the junction and the applicable flow rate of the expansion section is explored. The expansion section can reduce the entered length and motion time of the droplet when droplets flow into the channel with it, and finally avoid the possibility of droplet splitting. Even under a large difference of the branch flow rate, the expansion section can direct the droplet into its located channel. It is found that with the increase in continuous phase flow rate, the effect of the expansion section on the droplet motion behavior is gradually weakened until it disappears. Moreover, the critical conditions of it can be obtained by theoretical calculation. The expansion section can direct droplet motion in both symmetric and asymmetric junctions. However, it is mainly achieved by influencing the interfacial tension of the droplets in the symmetric junction, while the key force is related to the droplet motion in the asymmetric junction. Specifically, the expansion section influences the differential pressure force to direct the droplet in the flow into the side branch (with expansion section) mode, but it varies the interfacial tension of the droplet in the flow into the main branch mode.
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| GB/T 7714 | Pang, Yan , Jiao, Shaojie , Zhao, Siyu et al. Droplet motions directed by an expansion section in the T-junctions [J]. | PHYSICS OF FLUIDS , 2024 , 36 (9) . |
| MLA | Pang, Yan et al. "Droplet motions directed by an expansion section in the T-junctions" . | PHYSICS OF FLUIDS 36 . 9 (2024) . |
| APA | Pang, Yan , Jiao, Shaojie , Zhao, Siyu , Lou, Yi , Zhang, Longxiang , Wang, Xiang et al. Droplet motions directed by an expansion section in the T-junctions . | PHYSICS OF FLUIDS , 2024 , 36 (9) . |
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Abstract ：
微腔是一种常见的微通道结构,具有诱发流动分离形成层流涡的特性。研究微腔涡流动对理解微流控粒子分选、毛细血管生成和肺泡流动等相关微尺度流动现象具有重要意义。本文针对矩形微腔内层流涡流动及输运特性,利用显微高速摄影技术,开展了微通道主流与微腔涡流动及输运现象的染料可视化实验,探讨了染料脉线形成的"涡钩子"现象以及机理,初步揭示了微腔涡的流动及输运机理,为理解微腔流动现象及相关应用提供参考。
Keyword ：
涡 涡 "涡钩子" "涡钩子" 微流控 微流控 微腔 微腔 边界线 边界线
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| GB/T 7714 | 张越东 , 申峰 , 张杰 et al. 矩形微腔内“涡钩子”现象的实验研究 [C] //北京力学会第30届学术年会 . 2024 . |
| MLA | 张越东 et al. "矩形微腔内“涡钩子”现象的实验研究" 北京力学会第30届学术年会 . (2024) . |
| APA | 张越东 , 申峰 , 张杰 , 刘赵淼 . 矩形微腔内“涡钩子”现象的实验研究 北京力学会第30届学术年会 . (2024) . |
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Abstract ：
Metal foams with high porosity, light weight, and large specific surface area can significantly enhance heat transfer performance. In this study, the lattice Boltzmann method coupled with the finite difference method is used to investigate the flow boiling characteristics of metal foam surface. Focus is given on the effects of Reynolds number, gravitational acceleration, wall superheat, and metal foam thickness on heat transfer performance. Studies show that increasing the Reynolds number enhances convective heat transfer on the metal foam surface but inhibits bubble nucleation. Compared with a smooth surface, the metal foam takes full advantage of the fluid shear force induced by the high-velocity fluid in the channel-center region, thereby reducing the dependence on buoyancy for bubble detachment. As the wall superheat and metal foam thickness increase, the wake effect induced by bubble detachment is enhanced. Subsequently, bubble detachment is facilitated and the liquid supply is enhanced. These results provide theoretical and applied technical guidance for the structural design of novel metal foam surfaces.
Keyword ：
Flow boiling Flow boiling Lattice Boltzmann method Lattice Boltzmann method Numerical simulation Numerical simulation Metal foam Metal foam
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| GB/T 7714 | Cai, Fanming , Liu, Zhaomiao , Zheng, Nan et al. Lattice Boltzmann study of the effect of metal foam on bubble behavior and heat transfer performance in flow boiling [J]. | APPLIED THERMAL ENGINEERING , 2024 , 254 . |
| MLA | Cai, Fanming et al. "Lattice Boltzmann study of the effect of metal foam on bubble behavior and heat transfer performance in flow boiling" . | APPLIED THERMAL ENGINEERING 254 (2024) . |
| APA | Cai, Fanming , Liu, Zhaomiao , Zheng, Nan , Pang, Yan , Zhang, Longxiang . Lattice Boltzmann study of the effect of metal foam on bubble behavior and heat transfer performance in flow boiling . | APPLIED THERMAL ENGINEERING , 2024 , 254 . |
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Abstract ：
复合液滴在化工、医药和生物检测等领域有着广泛的应用,尺寸以及壳层厚度是复合液滴应用过程中的关键特征参数,研究复合液滴的动力学特性对建立相应的操控方法具有重要意义,有助于进一步实现复合液滴的按需制备.采用微流控技术制备了Y形和T形两种分岔结构,研究了双重乳化液滴(双乳液滴)在分岔结构处的流动行为.根据内、外液滴的分裂次数,将流动模式划分为二次分裂、一次分裂和不分裂 3 种.分析了流动模式的转变规律以及液滴长度对流动模式转变的影响,通过内、外液滴延伸长度、颈部宽度和缝隙宽度等特征参数的演化过程,将液滴运动过程划分为 3 个阶段,不分裂模式下为挤压、过渡和恢复,一次分裂以及二次分裂模式下为挤压、过渡和断裂,并讨论了相应的动力学机制.发现液滴长度的增加能有效降低液滴与通道之间的间隙宽度,导致双乳液滴所受的挤压力与剪切力增加,有利于液滴的分裂.基于比较成熟的单乳液滴理论,分别建立了内、外液滴的临界分裂条件,T形分岔结构的分裂临界线高于Y形,并进一步构建了内、外液滴毛细数和初始长度决定的流动模式分布图,可以很好地划分不同模式的分布区域,对于调控双乳液滴特性参数具有重要参考价值.
Keyword ：
通道结构 通道结构 分裂模式 分裂模式 临界条件 临界条件 动力学特性 动力学特性 双乳液滴 双乳液滴
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| GB/T 7714 | 刘赵淼 , 孙超 , 逄燕 et al. 分岔结构处双乳液滴的动力学特性研究 [J]. | 力学学报 , 2024 , 56 (5) : 1214-1222 . |
| MLA | 刘赵淼 et al. "分岔结构处双乳液滴的动力学特性研究" . | 力学学报 56 . 5 (2024) : 1214-1222 . |
| APA | 刘赵淼 , 孙超 , 逄燕 , 王翔 . 分岔结构处双乳液滴的动力学特性研究 . | 力学学报 , 2024 , 56 (5) , 1214-1222 . |
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Abstract ：
微流控技术由于具备操控微通道中微小体积流体的能力,已成为操控粒子和细胞的新平台.基于粒子惯性迁移和微凹槽涡胞捕获的粒子分选方法,是一种重要的微流控粒子操控技术.目前,微凹槽容纳的粒子数量不高,制约了该方法的效率.为了提高微凹槽粒子容量,对圆形微凹槽进行结构设计,并利用高速显微成像技术和数值模拟,研究了不同圆形微凹槽的粒子容纳能力.研究发现,相同入口雷诺数(Re=37～555)下,带底腔的圆形微凹槽相较于普通圆形微凹槽容纳的粒子数量提升了 45%,这是因为增加底腔后使得涡流线向下延展,形成更深的"U形"结构,可以容纳更多的粒子;当Re=482 时,带底腔的直径 500 μm的圆凹槽比直径 600 μm的圆凹槽的粒子容量提高了 93.9%,原因是前者凹槽内粒子运动轨道与流线更加吻合,粒子轨道面积与凹槽面积占比达到了 97%;随着Re增加,从侧通道收集到的粒子富集浓度整体呈现先缓慢增大后减小的趋势,收集到的20 μm粒子的最大富集浓度为初始悬浮液的 126.7 倍;不同微凹槽内粒子群的轨道运动受到涡流场特性、粒子物性及粒子间相互作用和壁面限制作用等因素的共同影响.研究结果对微凹槽结构设计和提高粒子分选性能有重要指导意义.
Keyword ：
粒子捕获 粒子捕获 涡胞 涡胞 微凹槽 微凹槽 微流控技术 微流控技术 粒子分选 粒子分选
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| GB/T 7714 | 申峰 , 张杰 , 艾明珠 et al. 微流控粒子分选中圆形微凹槽容纳特性研究 [J]. | 力学学报 , 2024 , 56 (5) : 1317-1327 . |
| MLA | 申峰 et al. "微流控粒子分选中圆形微凹槽容纳特性研究" . | 力学学报 56 . 5 (2024) : 1317-1327 . |
| APA | 申峰 , 张杰 , 艾明珠 , 张越东 , 刘赵淼 . 微流控粒子分选中圆形微凹槽容纳特性研究 . | 力学学报 , 2024 , 56 (5) , 1317-1327 . |
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