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学者姓名:刘赵淼
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Abstract :
Sharp phase interfaces and accurate temperature distributions are important criteria in the simulation of solid-liquid phase changes. The multi-relaxation-time lattice Boltzmann method (MRT-LBM) shows great numerical performance during simulation; however, the value method of the relaxation parameters needs to be specified. Therefore, in this study, a random forest (RF) model is used to discriminate the importance of different relaxation parameters to the convergence, and a support vector machine (SVM) is used to explore the decision boundary of the convergent samples in each dimensional model. The results show that the convergence of the samples is consistent with the sign of the decision number, and two types of the numerical deviations appear, i.e., the phase mushy zone and the non-physical heat transfer. The relaxation parameters chosen on the decision boundary can further suppress the numerical bias and improve numerical accuracy.
Keyword :
random forest (RF) random forest (RF) relaxation parameter relaxation parameter support vector machine (SVM) support vector machine (SVM) solid-liquid phase change solid-liquid phase change lattice Boltzmann method (LBM) lattice Boltzmann method (LBM)
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GB/T 7714 | Ren, Yanlin , Liu, Zhaomiao , Kang, Zixiao et al. Data-driven optimization study of the multi-relaxation-time lattice Boltzmann method for solid-liquid phase change [J]. | APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION , 2023 , 44 (1) : 159-172 . |
MLA | Ren, Yanlin et al. "Data-driven optimization study of the multi-relaxation-time lattice Boltzmann method for solid-liquid phase change" . | APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION 44 . 1 (2023) : 159-172 . |
APA | Ren, Yanlin , Liu, Zhaomiao , Kang, Zixiao , Pang, Yan . Data-driven optimization study of the multi-relaxation-time lattice Boltzmann method for solid-liquid phase change . | APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION , 2023 , 44 (1) , 159-172 . |
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Abstract :
The droplet motion in the T-junction is the basis for the design of droplet microfluidic chip. This paper investigates droplet motion in T-junction microchannels based on experiments and simulations to analyze the droplet motion mode and its effect on the downstream flow of the channel. The droplet motion can be divided into three modes, including flowing into the downstream main channel, flowing into the side branch, and splitting, whose transitions depend on the inlet flow ratio and droplet length. The critical droplet length, to determine whether the droplet is complete through the junction, follows a non-linear relationship of capillary number with the coefficient of 0.3-0.5, which is influenced by the liquid viscosity ratio. It was found that the droplets can be divided into two kinds according to its length by l(0) = 0.8w(m), which have significantly different interfacial deformations and cause various fluctuations of the branch flow even under the same flow conditions.
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GB/T 7714 | Pang, Yan , Jiao, Shaojie , Lu, Yao et al. Asymmetric branch selection and splitting of droplets in T-junction microchannels [J]. | PHYSICS OF FLUIDS , 2023 , 35 (7) . |
MLA | Pang, Yan et al. "Asymmetric branch selection and splitting of droplets in T-junction microchannels" . | PHYSICS OF FLUIDS 35 . 7 (2023) . |
APA | Pang, Yan , Jiao, Shaojie , Lu, Yao , Yang, Qingshan , Wang, Xiang , Liu, Zhaomiao . Asymmetric branch selection and splitting of droplets in T-junction microchannels . | PHYSICS OF FLUIDS , 2023 , 35 (7) . |
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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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Abstract :
As an effective tool for contactless manipulation of submicrometer scale objects, the controllability of acoustic streaming velocity and flow field morphology determines the accuracy of object migration and the completeness of three dimensional (3D) imaging. This paper proposes an equivalent acoustic streaming driving force model that is applicable to both two dimensional (2D) and 3D calculations and constructs a numerical method for submicrometer microsphere migration and rotation velocity in acoustic streaming. The results show that the relationship between the peripheral vortex size L-p/w(c) and the relative acoustic streaming velocity v(as)/v(f) satisfies L-p/w(c) = 0.125v(as)/v(f)(0.36) under certain geometrical conditions. Reducing the spatial confinement and increasing the inter-vortex distance will increase the energy release efficiency, reduce the pressure gradient distribution and convective dissipation rates, increase the vortex intensity and radiation range, and consequently, increase the vortex characteristic size. In complex 3D vortex flow fields, suspended objects are affected by velocity distributions and exhibit motions such as cross-flow lines and rotation. For larger vortex structure sizes, full 3D imaging is more favorable due to the increased rotation speed and period of motion along the orbit of the submicrometer microspheres. This study helps us to reveal the modulation mechanism of acoustic streaming field flow characteristics, enrich the basic theory of alternating orbital motion and forces on objects in vortex structures, and provide guidance for acoustic flow-based contactless object manipulation.
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GB/T 7714 | Zhao, Siyu , Liu, Zhaomiao , Ren, Yanlin et al. Study of micro-scale flow characteristics under surface acoustic waves [J]. | PHYSICS OF FLUIDS , 2023 , 35 (8) . |
MLA | Zhao, Siyu et al. "Study of micro-scale flow characteristics under surface acoustic waves" . | PHYSICS OF FLUIDS 35 . 8 (2023) . |
APA | Zhao, Siyu , Liu, Zhaomiao , Ren, Yanlin , Zheng, Nan , Chen, Rui , Cai, Fanming et al. Study of micro-scale flow characteristics under surface acoustic waves . | PHYSICS OF FLUIDS , 2023 , 35 (8) . |
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Abstract :
The dry-out phenomenon that occurs in the evaporation section under high thermal load can lead to heat pipe startup failure, which considerably affects the safe and efficient operation of microelectromechanical systems. In this study, the startup characteristics of a grooved heat pipe are investigated with the mesoscopic lattice Boltzmann method. The focus is on the effects of wettability, inclination angle, and liquid filling volume on the evolution of the liquid supply velocity and dry-spot area. Results show that nucleate boiling can be formed by starting the heat pipe at high heat flux, and the vapor jetting generated by bubble bursting can reduce the liquid supply velocity by more than 70%. Capillary pressure can be increased, and the perturbation of bubbles to the meniscus region can be suppressed by enhancing the wettability of the capillary wick, thus promoting the return of the condensate to the evaporation section. The pressure on the liquid side in the evaporation section decreases as the inclination angle increases, which shortens the waiting time for vapor core formation and improves the stability of boiling behavior. A non-monotonic relationship exists between the liquid filling volume and heat transfer limit time of the heat pipe, which reaches the maximum only when the initial liquid layer fills the capillary wick exactly.
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GB/T 7714 | Cai, Fanming , Liu, Zhaomiao , Zheng, Nan et al. Mesoscopic numerical study of the startup characteristics of grooved heat pipe under high heat flux [J]. | PHYSICS OF FLUIDS , 2023 , 35 (7) . |
MLA | Cai, Fanming et al. "Mesoscopic numerical study of the startup characteristics of grooved heat pipe under high heat flux" . | PHYSICS OF FLUIDS 35 . 7 (2023) . |
APA | Cai, Fanming , Liu, Zhaomiao , Zheng, Nan , Ren, Yanlin , Pang, Yan . Mesoscopic numerical study of the startup characteristics of grooved heat pipe under high heat flux . | PHYSICS OF FLUIDS , 2023 , 35 (7) . |
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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 :
Metal droplet deposition manufacturing is an additive manufacturing technique that relies on the accurate prediction of deposition position, but is influenced by the wetting degree of solidified surface and the substrate. In this paper, a modified solid discriminant function is proposed for the simple-component pseudopotential model in the lattice Boltzmann method. The results show that the wetting degree of the substrate and the pre-solidified droplet causes the post-deposited droplet to deviate from the initial deposition distance L *(i) under interfacial tension, producing an offset d L *. However, the solidification effect inhibits spreading and rebound motion, thus changing the actual d L *. Under the solidification effect, different wetting degrees show that the horizontal deviation is more influenced by the pre-solidified droplet than the substrate and can be linearly predicted. The deposition can be divided into two stages depending on the attraction and repulsion motions of the droplets. In the attraction stage, the droplets form a three-phase contact line with the solidification surface, generating the pressure drop with the negative horizontal component under capillary expansion. In the repulsion stage, the second contact line is formed on the substrate, generating a smaller pressure drop in the horizontal direction. The essence of the difference effects of the two surfaces lies in the contacting duration and direction. Based on the principle of deposition deviation proposed in this paper, it will help to optimize the process parameters and improve the molding accuracy.
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GB/T 7714 | Ren, Yanlin , Liu, Zhaomiao , Gao, Shanshan et al. Investigation of the molten droplet deposition offset based on the simple-component pseudopotential model [J]. | PHYSICS OF FLUIDS , 2023 , 35 (6) . |
MLA | Ren, Yanlin et al. "Investigation of the molten droplet deposition offset based on the simple-component pseudopotential model" . | PHYSICS OF FLUIDS 35 . 6 (2023) . |
APA | Ren, Yanlin , Liu, Zhaomiao , Gao, Shanshan , Pang, Yan . Investigation of the molten droplet deposition offset based on the simple-component pseudopotential model . | PHYSICS OF FLUIDS , 2023 , 35 (6) . |
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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 :
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 :
Particle orbiting motion in a confined microvortex is a fascinating phenomenon of fluid mechanics. In this Letter, we quantitatively measured the motion of a neutrally buoyant spherical particle with finite size, which recirculates along a ring-shaped orbit periodically in a microvortex at the Reynolds number of 303. The particle dynamics have been characterized along the orbit, which can be divided into accelerating, swerving, and following phases. By comparing the relationship between the particle and streamlines, the deviations of their trajectories and velocities have been revealed. The results could provide a deep insight into the physics of particle dynamics and particle-fluid interactions.
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GB/T 7714 | Shen, Feng , Ai, Mingzhu , Li, Zonghe et al. Particle orbiting motion and deviations from streamlines in a microvortex [J]. | APPLIED PHYSICS LETTERS , 2022 , 120 (2) . |
MLA | Shen, Feng et al. "Particle orbiting motion and deviations from streamlines in a microvortex" . | APPLIED PHYSICS LETTERS 120 . 2 (2022) . |
APA | Shen, Feng , Ai, Mingzhu , Li, Zonghe , Xue, Sen , Xu, Min , Liu, Zhaomiao . Particle orbiting motion and deviations from streamlines in a microvortex . | APPLIED PHYSICS LETTERS , 2022 , 120 (2) . |
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