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学者姓名：刘赵淼
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Abstract ：
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 ：
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 ：
This article investigates the equilibrium arrangement, self-assembly process, and subsequent curing of amphiphilic snowman-shaped Janus particles at the oil-water interface. The independent Janus particles are in vertical equilibrium state and the contact position of the oil-water interface is at the largest cross section of the particle's hydrophobic phase. Under the effect of the surface tension and the adsorption of materials, Janus particles may form particle combinations including the particle pairs and the particle triangle, whose inner and outer sides have the liquid surface exhibiting completely opposite contact angles. Particle combinations form stable parallel double-chain structures with diverse shapes after the self-assembly process. However, the single Janus particles attain a state of mechanical equilibrium under the influence of surrounding particles, enabling them to assemble into regular array structures. The relationship of interfacial tension coefficient between phases can be changed by adjusting the oil-water system, which leads to variations in the self-assembly speed and the final arrangement results. The thin-film with uniformly distributed vertical particles is achieved by replacing the underlying deionized water with a curing agent. Based on the understanding of the interactions between irregularly shaped Janus particles at the oil-water interface, it will be convenient to achieve the controllable self-assembly and widely applications of these particles.
Keyword ：
Interaction Interaction Particle combination Particle combination Janus particles Janus particles Self-assembly Self-assembly UV light curing UV light curing
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| GB/T 7714 | Pang, Yan , Li, Lin , Lou, Yi et al. Equilibrium and self-assembly of Janus particles at liquid-liquid interfaces for the film formation [J]. | COLLOIDS AND SURFACES B-BIOINTERFACES , 2024 , 244 . |
| MLA | Pang, Yan et al. "Equilibrium and self-assembly of Janus particles at liquid-liquid interfaces for the film formation" . | COLLOIDS AND SURFACES B-BIOINTERFACES 244 (2024) . |
| APA | Pang, Yan , Li, Lin , Lou, Yi , Wang, Xiang , Liu, Zhaomiao . Equilibrium and self-assembly of Janus particles at liquid-liquid interfaces for the film formation . | COLLOIDS AND SURFACES B-BIOINTERFACES , 2024 , 244 . |
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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 ：
Molten microdroplet printing technology takes the uniform metal droplet as the basic forming unit, and it is a kind of rapid printing technology based on the shape characteristics of the parts to realize the manufacturing parts. This paper is investigated that during the microdroplet 3D printing (three-dimensional printing), electronics is studied based on the coupled level collective integral number method (coupled level set and volume of fluid) and the equivalent heat capacity method. The influence of the regional wettability characteristics of the heterogeneous functional wettability surface and its matching mode on the droplet spreading and coalescence behavior and the phase transition thermal process is explored. The precise regulation mechanism of heterogeneous functional wettability surfaces on the coalescence and forming of molten droplets is revealed. The results show that the wettability matching schemes of dual-functional-region surfaces and spaced multiple functional region surfaces can effectively regulate the dimensionless feature spreading lengths, dimensionless feature average heights, and dimensionless spreading edge spreading uniformities of the double-droplet and multiple droplet simultaneous impingement and coalescence morphologies, respectively. Under the condition of uniform wettability characteristics of the surface, the heat flow density and average temperature inside the molten fluid at the initial stage of the coalescence of double/multiple droplets show more regular symmetrical characteristics. The heat transfer effectiveness at the gap position is low and decreases with the increase in contact angle; when the surfaces are under heterogeneous bifunctional vs spaced multifunctional wettability conditions, the evolution of the overall heat transfer effectiveness of each type of wettability matching scheme increases with the increase in the wall contact angles of the single type of regions. In addition, when the surface wettability matching scheme includes a transition stage from neutral to superlyophobic, the liquid-gas interface is highly susceptible to overcoming the limitation of the energy barrier and thus instability gradually emerges, resulting in fluctuations of the heat transfer characteristics in its domain. The results of this study further enrich the droplet forming law and its phase transition heat transfer mechanism and provide a general strategy for the high-quality and high-effectiveness preparation of complex flexible electronic devices.
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| GB/T 7714 | Zheng, Nan , Liu, Zhaomiao , Cai, Fanming et al. The morphology regulation mechanism during coalescence fusion printing of multiple molten droplets [J]. | PHYSICS OF FLUIDS , 2024 , 36 (10) . |
| MLA | Zheng, Nan et al. "The morphology regulation mechanism during coalescence fusion printing of multiple molten droplets" . | PHYSICS OF FLUIDS 36 . 10 (2024) . |
| APA | Zheng, Nan , Liu, Zhaomiao , Cai, Fanming , Zhao, Siyu , Zheng, Kai , Zhang, Chenchen et al. The morphology regulation mechanism during coalescence fusion printing of multiple molten droplets . | PHYSICS OF FLUIDS , 2024 , 36 (10) . |
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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 application performance of droplets, including the size and core-shell volumetric ratio of a double emulsion droplet, is investigated under various geometric sizes and flow rates in a flow-focusing capillary device. This study uses three-dimensional (3D) printing to create a novel substrate to assemble capillaries and make the inner dimension of the device tunable. Droplet generation is separated into two regions (uniform or non-uniform) based on the interface coupling shapes, where different generation modes are classified based on the rupture form of the multilayer interfaces. A map of the generation modes is established based on geometric size and flow conditions. In the dripping mode, interface coupling and its effect on generation are analyzed by the interface necking process for the two generation sub-modes (with/without a ball). The local capillary number of the double emulsion droplet is established for these sub-modes to analyze variations in the inner droplet volume, which helps propose the volume predictive model of inner and outer droplets.
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| GB/T 7714 | Pang, Yan , Li, Lin , Ru, Jiahe et al. Interface coupling and droplet size under various flow-focusing geometry dimensions in double emulsion formation [J]. | PHYSICS OF FLUIDS , 2023 , 35 (12) . |
| MLA | Pang, Yan et al. "Interface coupling and droplet size under various flow-focusing geometry dimensions in double emulsion formation" . | PHYSICS OF FLUIDS 35 . 12 (2023) . |
| APA | Pang, Yan , Li, Lin , Ru, Jiahe , Zhou, Qiang , Wang, Xiang , Liu, Zhaomiao . Interface coupling and droplet size under various flow-focusing geometry dimensions in double emulsion formation . | PHYSICS OF FLUIDS , 2023 , 35 (12) . |
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Abstract ：
Two-phase displacements in cavity-featured configurations are ubiquitous phenomena. However, the morpho-logical evolution of the two-phase interface during displacements in cavities is still unclear. Herein, the dynamic evolution of the oil-water interface morphology in three microcavities and transient flow field characteristics is investigated. The influence of the cavity size, channel width, and inlet flow rate on the interface dynamics and the retention ratio of water is parametrically studied. Furthermore, the slippage distance and slip velocity of the interface on cavity walls are comprehensively characterized. A new interface pining mechanism on a small chamfer is proposed. Flow visualization experiments using micro-particle imaging velocimetry and computa-tional fluid dynamics (CFD) simulations are conducted to further reveal the transient flow field characteristics. The results provide an in-depth understanding of the background physics of two-phase displacements and pro-vide guidance for the design of cavity-based functional surfaces.
Keyword ：
Oil-water interface Oil-water interface Pinning effect Pinning effect Two-phase displacements Two-phase displacements Retention ratio Retention ratio Slippage distance Slippage distance
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| GB/T 7714 | Shen, Feng , Zhu, Lin , Ji, Deru et al. Dynamic evolution of oil-water interface during displacement in microcavities [J]. | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2023 , 658 . |
| MLA | Shen, Feng et al. "Dynamic evolution of oil-water interface during displacement in microcavities" . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 658 (2023) . |
| APA | Shen, Feng , Zhu, Lin , Ji, Deru , Zhao, Siyu , Liu, Zhaomiao . Dynamic evolution of oil-water interface during displacement in microcavities . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2023 , 658 . |
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Abstract ：
The molten metal droplet printing technology can effectively realize a precise preparation of complex electronic devices at the micro scale by relying on the metallurgical bonding among the tiny molten metal droplets, which can improve the metallographic structure and mechanical properties of the fabri-cated parts. In this paper, the interaction process between metal droplets and movable substrates during the preparation of electronic devices is studied based on the coupled level set volume of fluid method (CLSVOF) and equivalent heat capacity method. The influence of the micro-bubbles and wall infiltration characteristics on the impingement spreading flow of metal droplets and their heat transfer cooling pro-cess is also investigated. The evolution mechanisms of droplet geometry and the distribution characteris-tics of droplet internal temperature and heat flow density during the impingement spreading process are discussed. The mechanism of high-temperature region formation under superhydrophobic wall conditions is analyzed. Results show that the microbubbles inhibit the spread of molten metal droplet. Under the same conditions, the spreading radius of hollow metal droplet is smaller than that of solid droplet, and their spreading height is higher than that of solid droplet. Different wall infiltration characteristics have similar degrees of influence on the spread of solid and hollow droplets. A larger wall contact angle for the same impingement mode at the same moment corresponds to a smaller droplet spreading radius and the higher the spreading height. With the participation of microbubbles, the heat transfer cooling process inside metal droplet becomes slow and demonstrates a less uniform temperature and heat flow density distribution. A high-temperature region is easily formed inside droplet under superlyophobic wall condi-tions, which triggers an uneven heat transfer cooling process at the bottom of the droplet. The results benefit to reveal the law of metal microdroplet impingement molding on different working surfaces and provide a theoretical reference for the preparation of electronics-related devices.(c) 2023 Elsevier Ltd. All rights reserved.
Keyword ：
Metal melt droplet printing Metal melt droplet printing Infiltration characteristics Infiltration characteristics Microbubble Microbubble Phase -change cooling Phase -change cooling Electronics manufacturing Electronics manufacturing
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| GB/T 7714 | Zheng, Nan , Liu, Zhaomiao , Pang, Yan et al. Study on flow and heat transfer characteristics of 3D molten aluminum droplet printing process [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2023 , 204 . |
| MLA | Zheng, Nan et al. "Study on flow and heat transfer characteristics of 3D molten aluminum droplet printing process" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 204 (2023) . |
| APA | Zheng, Nan , Liu, Zhaomiao , Pang, Yan , Cai, Fanming , Zhao, Siyu . Study on flow and heat transfer characteristics of 3D molten aluminum droplet printing process . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2023 , 204 . |
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Abstract ：
Particle orbital motion in a hydrodynamic vortex confined in a microcavity is a relatively new issue of fluid mechanics. In this study, we use a high-speed microscopy system to visualize the phenomenon of particle two-orbital motion within a laminar microvortex. Specifically, a finite-size particle recirculates along a small inner orbit and a large outer orbit alternately and periodically. The influences of the inlet Reynolds number (Re = 110-270), particle diameter (d = 20 and 30 mu m), and microcavity size on the particle orbiting behaviors are investigated. The vortical flow field, orbital morphology, and particle velocity variations are characterized quantitatively to elucidate the mechanisms of particle recirculation along the dual orbits. The particle orbital motion results from the combined effects of hydrodynamic forces, particle slingshot effect, and particle-wall interactions in a complex way. The findings of this study could deepen the understanding of the particle orbital motion in a microvortex.
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| GB/T 7714 | Shen, Feng , Gao, Jie , Ai, Mingzhu et al. Mechanism of particle dual-orbital motion in a laminar microvortex [J]. | PHYSICS OF FLUIDS , 2023 , 35 (7) . |
| MLA | Shen, Feng et al. "Mechanism of particle dual-orbital motion in a laminar microvortex" . | PHYSICS OF FLUIDS 35 . 7 (2023) . |
| APA | Shen, Feng , Gao, Jie , Ai, Mingzhu , Li, Zonghe , Liu, Zhaomiao . Mechanism of particle dual-orbital motion in a laminar microvortex . | PHYSICS OF FLUIDS , 2023 , 35 (7) . |
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