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学者姓名：刘赵淼
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Abstract ：
Intracranial aneurysm (IA) is a prevalent cerebrovascular disease associated with high mortality and disability rates upon rupture. The hemodynamics of IA, which are significantly influenced by geometric parameters, directly impact its rupture. This study focuses on investigating the transient flow characteristics in saccular IA models fabricated using a water droplet-based method, specifically examining the influence of neck widths. Particle image velocimetry technique and numerical simulation were employed to investigate the dynamic evolution of flow structures within three IA models. The results reveal that neck width (W) has a substantial effect on flow characteristics in the neck region, subsequently impacting the deep flow inside the sac. Three distinct patterns were observed during flow evolution inside the sac: for W = 2 mm, two vortices occur and then disappear with relatively low average flow velocity; for W = 4 mm, enhanced effects of a high-speed jet result in periodic pulsatile flow velocity distribution while maintaining stable vortex core position; for W = 6 mm, significant changes in flow velocity occur due to size expansion and intensity increase of vortices. These findings demonstrate that neck widths play a complex role in influencing transient flow characteristics within IAs. Overall, this research contributes to further understanding transient flow behaviors in IAs.
Keyword ：
Intracranial aneurysm Intracranial aneurysm Neck width Neck width Particle image velocimetry Particle image velocimetry Flow pattern Flow pattern Hemodynamics Hemodynamics
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| GB/T 7714 | Shen, Feng , Cheng, Siyuan , Yang, Xin et al. Influence of neck width on transient flow characteristics in saccular intracranial aneurysm models [J]. | ACTA MECHANICA SINICA , 2025 , 41 (4) . |
| MLA | Shen, Feng et al. "Influence of neck width on transient flow characteristics in saccular intracranial aneurysm models" . | ACTA MECHANICA SINICA 41 . 4 (2025) . |
| APA | Shen, Feng , Cheng, Siyuan , Yang, Xin , Lu, Xinran , Liu, Zhaomiao . Influence of neck width on transient flow characteristics in saccular intracranial aneurysm models . | ACTA MECHANICA SINICA , 2025 , 41 (4) . |
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Abstract ：
The microcavity setting promotes bubble nucleation, and the presence of an electric field enables bubble detachment. In this study, the synergistic effect of electric field and microcavity in improved flow boiling heat transfer was analyzed based on the pseudopotential lattice Boltzmann method. The investigation was focused on the influence of wall superheat, Reynolds (Re) number, electric field intensity, liquid subcooling, and gravitational acceleration on the flow boiling performance under two forms of electric field distributions for uniform conducting microcavity surface (MC-UCS) and conducting-insulating microcavity surface (MC-CIS). Compared with the MC-UCS, the MC-CIS maintained a stable wetting state in the microcavity through inhibition of sliding and merging of bubbles. The increase in electric field intensity and Re number improved convective heat transfer in the microcavity but at the expense of a larger frictional pressure drop. The boiling phenomenon on the microcavity surface weakened with the increase in liquid subcooling, which caused difficulty for the electric field to improve the heat transfer performance by improving bubble behavior. Electrical force can replace buoyancy force to perturb the vapor-liquid interface under low gravitational acceleration. This condition allows the fluid shear force to drive bubbles away from the microcavity surface quickly. The results can provide theoretical and technical guidance for the realization of the enhanced synergistic heat transfer between electric fields and microstructures.
Keyword ：
Numerical simulation Numerical simulation Flow Boiling Flow Boiling Lattice Boltzmann method Lattice Boltzmann method Electric Field Electric Field
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| GB/T 7714 | Cai, Fanming , Liu, Zhaomiao , Zheng, Nan et al. Numerical study of flow boiling on microcavity surface under the action of an electric field using lattice Boltzmann method [J]. | APPLIED THERMAL ENGINEERING , 2024 , 258 . |
| MLA | Cai, Fanming et al. "Numerical study of flow boiling on microcavity surface under the action of an electric field using lattice Boltzmann method" . | APPLIED THERMAL ENGINEERING 258 (2024) . |
| APA | Cai, Fanming , Liu, Zhaomiao , Zheng, Nan , Pang, Yan . Numerical study of flow boiling on microcavity surface under the action of an electric field using lattice Boltzmann method . | APPLIED THERMAL ENGINEERING , 2024 , 258 . |
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Abstract ：
Droplet microfluidics has received increasing attention over the past decade. This study proposes an easy method for droplet generation in microchannels by inserting a glass capillary into a microfluidic chip at required positions. The influences of the capillary insertion depth (0, 60, and 120 mu m), capillary inner diameter (50, 75, and 100 mu m), and two-phase flow rate ratios (2-12) on the generated droplet length were investigated. The evolution of the two-phase interface during droplet formation is observed in detail, which undergoes three successive stages: head formation, head filling, and neck breakage. Three neck breakage modes were identified as the squeezing, transition, and dripping modes, and the forces acting on the droplets were analyzed. The results show that the proposed capillary-based method can facilitate the generation of droplets in fabricated microfluidic chips over a wide range of two-phase flow rate ratios.
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| GB/T 7714 | Shen, Feng , Chen, Jie , Li, Chunyou et al. Easy Generation of Droplets in a Capillary Inserted Microchannel [J]. | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH , 2024 , 63 (4) : 2021-2030 . |
| MLA | Shen, Feng et al. "Easy Generation of Droplets in a Capillary Inserted Microchannel" . | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 63 . 4 (2024) : 2021-2030 . |
| APA | Shen, Feng , Chen, Jie , Li, Chunyou , Yuan, Yongchun , Liu, Zhaomiao . Easy Generation of Droplets in a Capillary Inserted Microchannel . | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH , 2024 , 63 (4) , 2021-2030 . |
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Abstract ：
The transportation behaviors of compound droplets in confined channels are widespread phenomena while the physical mechanisms are far from being completely unraveled. In this work, behaviors of double emulsions flowing through bifurcation microchannels are experimentally studied with the aim of building universal flow pattern maps. Three flow patterns are categorized according to different features of daughter droplets in terms of size, uniformity, and shell thickness. A detailed analysis of the dynamics of interfacial evolutions in different patterns is carried out and the coupling interaction between interfaces is found to affect the minimum tail distance during transportation. It is feasible to obtain the threshold of the occurrence of the coupling interaction, due to the different variation tendencies in the two states, which relies on three dimensionless parameters, i.e. droplet length, length ratio, and capillary number. Furthermore, a novel physical model is proposed to build the flow pattern map, with the two transition boundaries being expressed as different relationships in terms of the three identified parameters. The physical mechanisms are summarized with the aid of force analysis. An excellent agreement is shown between the model and experimental results in different liquid systems and bifurcation structures, indicating the generality of the proposed model. Flow pattern map of double emulsions considering the coupling interaction between interfaces.
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| GB/T 7714 | Wang, Xiang , Sun, Chao , Jia, Shiyan et al. Flow pattern maps of double emulsions transporting through bifurcation microchannels [J]. | SOFT MATTER , 2024 , 20 (33) . |
| MLA | Wang, Xiang et al. "Flow pattern maps of double emulsions transporting through bifurcation microchannels" . | SOFT MATTER 20 . 33 (2024) . |
| APA | Wang, Xiang , Sun, Chao , Jia, Shiyan , Pang, Yan , Liu, Zhaomiao . Flow pattern maps of double emulsions transporting through bifurcation microchannels . | SOFT MATTER , 2024 , 20 (33) . |
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Abstract ：
The uniformity in size of liquid metal droplets is crucial in determining the accuracy of flexible circuit printing as well as the stability in signal transmission. In this study, the numerical simulation and the experiment method are combined to analyze the droplet preparation process of liquid metal. Furthermore, the mechanism of the surface acoustic wave as an external force dominating the breakup of the liquid metal interface is investigated. The results show that the squeezing pressure and the capillary force are the dominant forces of the interface evolution in the low-aspect-ratio (height/width) channel. When the dispersed phase flow rate is low, the interface will retract upstream of the channel under the influence of large interfacial tension after breakup, resulting in fluctuations in flow rate, and therefore, the stability of droplet size is weak. When the dispersed phase flow rate is high, the interface randomly breaks up under the influence of the Rayleigh-Plateau instability, which also leads to uneven droplet size. As the acoustic intensity increases, the acoustic radiation pressure gradually becomes the dominant force responsible for the squeezing and breakup of the interface. It increases the radial contraction rate of the interface, shortens the droplet generation period, and ultimately reduces the droplet size. Additionally, the size deviation value is significantly reduced from 10.13% to 1.05%. This study is useful in elucidating the evolution mechanism of liquid metal interfaces in low-aspect-ratio channels, improving the fundamental theory of interface breakup caused by acoustic radiation pressure, and providing theoretical guidance for the controlled and stable production of liquid metal droplets.
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| GB/T 7714 | Zhao, Siyu , Liu, Zhaomiao , Zheng, Nan et al. Formation characteristics and acoustic regulation of liquid metal droplets in low-aspect-ratio channels [J]. | PHYSICS OF FLUIDS , 2024 , 36 (1) . |
| MLA | Zhao, Siyu et al. "Formation characteristics and acoustic regulation of liquid metal droplets in low-aspect-ratio channels" . | PHYSICS OF FLUIDS 36 . 1 (2024) . |
| APA | Zhao, Siyu , Liu, Zhaomiao , Zheng, Nan , Zhang, Chenchen , Cai, Fanming , Zheng, Kai et al. Formation characteristics and acoustic regulation of liquid metal droplets in low-aspect-ratio channels . | PHYSICS OF FLUIDS , 2024 , 36 (1) . |
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Abstract ：
本发明公开了一种基于微通道凹槽内涡胞流动的流量测量装置及方法，属于流量测量装置领域，测量装置中，流体主通道为矩形结构，圆形微凹槽为圆形与流体主通道部分相交形成的弧形结构，圆形微凹槽与流体主通道在相交部位相连通，且设置粒子和第二相不相溶液体补充通道向圆形微凹槽中输入第二相不相溶液体和单个示踪粒子；流体主通道中通入待测流体，待测流体带动示踪粒子形成二次流动，微型光感传感器检测示踪粒子的运动频率，以计算得到待测流体的流量。通过本发明的技术方案，实现了流体不同流量的检测，具有相当的分辨率，适用针对不适合示踪粒子的待测样本实现无污染的粒子跟踪测速，装置结构简单、易于制造、紧凑便携，适用大规模生产。
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| GB/T 7714 | 申峰 , 张杰 , 高杰 et al. 一种基于微通道凹槽内涡胞流动的流量测量装置及方法 : CN202310827136.9[P]. | 2023-07-06 . |
| MLA | 申峰 et al. "一种基于微通道凹槽内涡胞流动的流量测量装置及方法" : CN202310827136.9. | 2023-07-06 . |
| APA | 申峰 , 张杰 , 高杰 , 刘赵淼 . 一种基于微通道凹槽内涡胞流动的流量测量装置及方法 : CN202310827136.9. | 2023-07-06 . |
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Abstract ：
The boiling heat transfer technology with cavity surfaces can provide higher heat flux under lower wall superheat, which is of great significance for the cooling of electronic chips and microelectromechanical devices. In this paper, the boiling characteristics of the cavity surfaces are investigated based on the lattice Boltzmann (LB) method, focusing on the effects of cavity shapes, sizes, and heater thermal conductivity on the heat transfer performance. The results show that the triangular cavity has the best boiling performance since it has less residual vapor and higher bubble departure frequency than those of the trapezoidal and rectangular cavities. As the cavity size increases, the enhancement of heat transfer by the cavity mouth is suppressed by the heat accumulation effect at the heater bottom. The liquid rewetting process during bubble departure is the reason for the fluctuation of the space-averaged heat flux, and the heater thermal conductivity determines the fluctuation amplitude. The evaporation of liquid in the cavity with high thermal conductivity walls is more intense, resulting in shorter waiting time and higher bubble departure frequency.
Keyword ：
boiling boiling O357 O357 cavity cavity conjugate heat transfer conjugate heat transfer lattice Boltzmann (LB) method lattice Boltzmann (LB) method
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| GB/T 7714 | Cai, Fanming , Liu, Zhaomiao , Zheng, Nan et al. Lattice Boltzmann simulation of the effects of cavity structures and heater thermal conductivity on nucleate boiling heat transfer [J]. | APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION , 2023 , 44 (6) : 981-996 . |
| MLA | Cai, Fanming et al. "Lattice Boltzmann simulation of the effects of cavity structures and heater thermal conductivity on nucleate boiling heat transfer" . | APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION 44 . 6 (2023) : 981-996 . |
| APA | Cai, Fanming , Liu, Zhaomiao , Zheng, Nan , Ren, Yanlin , Pang, Yan . Lattice Boltzmann simulation of the effects of cavity structures and heater thermal conductivity on nucleate boiling heat transfer . | APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION , 2023 , 44 (6) , 981-996 . |
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Abstract ：
The role of elasticity on the flow topology inside viscoelastic (Boger) droplets moving in a rectangular micro-channel is examined experimentally by means of micro Particle Image Velocimetry (& mu;PIV). Polyacrylamide (PAAM) water-glycerol solutions of different concentrations are employed to vary droplet elasticity. Varying the Wi number alters the flow topology inside the Boger microdroplets, progressively reducing the number of vortical structures observed until their complete disappearance. The flow structure resembles that of Newtonian inelastic droplets for low Wi and elasticities. However, when the Wi and elastic number increase above one-i.e. elastic effects become more important-a new flow structure is observed at the front of the droplets characterized by two recirculating regions either side of the droplet centreline. Spatiotemporal maps show that the flow in this new regime fluctuates periodically around the centreline indicating the onset of an elastic instability. This flow transition is attributed to the well documented coupled effects of polymer stretching and curved streamlines and resultant hoop stresses. The findings highlight the importance elasticity can have on the nature of microdroplet flows of complex fluids and the potential of tuning elasticity to engineer flow structures for given microfluidic applications.
Keyword ：
Boger Boger MicroPIV MicroPIV Elastic transitions Elastic transitions Microdroplets Microdroplets Flow topology Flow topology
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| GB/T 7714 | Li, Mengqi , Boulafentis, Theofilos , Stathoulopoulos, Antonios et al. Flows inside polymer microfluidic droplets: Role of elasticity [J]. | CHEMICAL ENGINEERING SCIENCE , 2023 , 278 . |
| MLA | Li, Mengqi et al. "Flows inside polymer microfluidic droplets: Role of elasticity" . | CHEMICAL ENGINEERING SCIENCE 278 (2023) . |
| APA | Li, Mengqi , Boulafentis, Theofilos , Stathoulopoulos, Antonios , Liu, Zhaomiao , Balabani, Stavroula . Flows inside polymer microfluidic droplets: Role of elasticity . | CHEMICAL ENGINEERING SCIENCE , 2023 , 278 . |
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Abstract ：
Microdroplet printing technology can effectively realize the precision preparation of complex electronic devices at the micro-scale, relying on the mutual interaction between the tiny micro-droplets, which can improve the organizational microstructure of the fabricated parts and effectively enhancement the mechanical properties of the fabricated parts. In this paper, the interaction process between micro-droplets and patterned wetted modified surfaces during the microdroplet printed process is studied based on the coupled level collective integral number method (CLSVOF) and equivalent heat capacity method. The influence of patterned schemes for non-uniform surface wetting modification, regional wetting differences and impingement process parameters on the impingement spreading flow of metal droplets and their heat transfer cooling process is investigated. The evolution mechanisms of the droplet geometry and the distribution characteristic of the droplet internal temperature and heat flow density during the impingement spreading process are discussed. The optimization mechanism of heterogeneous wetting modified surfaces for molten droplet forming is revealed. The results show that the fourway homogeneous pattern modification scheme can effectively improve the microdroplet stabilization rate and enhance the preparation efficiency by ensuring the shape size and positioning accuracy. Four three-phase contact lines morphology patterns for the equilibrium state of droplets, namely, circular, rectangular, concave shape and rhombic, were obtained by adjusting the wetting differences between the areas. A scheme to regulate the surface behavior of printed microdroplets with lyophilic high-adhesion region to anchor the droplets and lyophobic lowadhesion environment to provide a physical barrier to confine the droplet morphology was developed. In addition, the pattern modification scheme has an obvious optimization effect for the droplet forming and its heat exchange process in the process of metal droplet printing. Basis on the ensuring the radial dimensional accuracy and sphericity of the molten droplet molding, the rebound and oscillation behavior of the molten droplet is effectively suppressed. The stabilizing efficiency of droplet printing is greatly enhanced and further improves the heat transfer performance of the droplet. The results further enrich the theory of precise regulation of the dynamic behavior of droplet surfaces. Not only can it be used as a new strategy for universal high-precision printing and droplet control, but it will also promote the application and development of technologies in numerous fields, such as liquid transport and microfluidics.
Keyword ：
Patterned heterogeneous surfaces Patterned heterogeneous surfaces Microdroplet printing Microdroplet printing Wetting differences Wetting differences Droplet impingement Droplet impingement Molten phase change Molten phase change
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| GB/T 7714 | Zheng, Nan , Liu, Zhaomiao , Cai, Fanming et al. The morphology regulation mechanism of microdroplet printing based on heterogeneous wettability surfaces [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2023 , 219 . |
| MLA | Zheng, Nan et al. "The morphology regulation mechanism of microdroplet printing based on heterogeneous wettability surfaces" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 219 (2023) . |
| APA | Zheng, Nan , Liu, Zhaomiao , Cai, Fanming , Zhao, Siyu , Ren, Yanlin , Pang, Yan . The morphology regulation mechanism of microdroplet printing based on heterogeneous wettability surfaces . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2023 , 219 . |
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Abstract ：
The flow patterns of immiscible liquids in microscale cross junctions are experimentally studied and the influencing factors including the capillary number (3 x 10- 4-6 x 10-1), flow rate ratio (0.004-60), viscosity ratio (0.04-2.8), and channel aspect ratio (1/3-1) are systematically analyzed. Evolutions of the interfacial morphologies in different flow patterns are discussed with the aid of force analysis. In the droplet group, two different breakup modes of the liquid thread are found with the symmetric mode for squeezing and the asymmetric mode for dripping, which are divided by a critical capillary number around 0.01. Two different physical models for constructing the scaling law of the droplet length are compared over large ranges of flow parameters and the universal scaling law is valid to identify the transitional boundary between squeezing and dripping regimes. In the jet group, the jet width in different channels is compared to the theoretical prediction. A detailed comparison between the experimental results in jetting and the linear instability theory is further conducted and the reason for the polydispersity of the droplet size in widening jetting is found. Finally, the flow pattern maps are built using dimensionless parameters in both the global terms and the local terms. In contrast, the local dimensionless parameters are confirmed to show a better performance in unifying the transitional boundary between two groups of flow patterns. The obtained results should be useful for the further understanding of the dynamic mechanisms of the microscale multiphase flow.
Keyword ：
Jet Jet Flow pattern Flow pattern Droplet Droplet Scaling law Scaling law Dynamics Dynamics Cross junction Cross junction
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| GB/T 7714 | Wang, Xiang , Ma, Yilin , Zhang, Chenchen et al. Flow patterns and dynamic mechanisms of immiscible fluids in cross junctions with different aspect ratios [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2023 , 149 . |
| MLA | Wang, Xiang et al. "Flow patterns and dynamic mechanisms of immiscible fluids in cross junctions with different aspect ratios" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 149 (2023) . |
| APA | Wang, Xiang , Ma, Yilin , Zhang, Chenchen , Pang, Yan , Liu, Zhaomiao . Flow patterns and dynamic mechanisms of immiscible fluids in cross junctions with different aspect ratios . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2023 , 149 . |
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