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学者姓名：赵亮
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Abstract ：
In last several decades, there are great development in electronic technology, which needs high performance cooling schemes urgently. Recently, an enhanced flow boiling of open micro-channel and jet impingement hybrid cooling scheme by separating liquid-vapor pathways is proposed with a critical heat flux of 546 W/cm(2). Nevertheless, due to the introduction of jet impingement, the bubbles generated in channel are compelled to migrate to the fins top to gather and grow. Consequently, a new series of bubbles behavior and flow patterns were observed. In order to have a further understand of flow patterns and the transition mechanism, visualization experiments are conducted with the deionized water, inlet temperature is 16 - 19 degrees C, and volumetric flow rate for micro-channel and jet impingement is 50 ml/min respectively. Subsequently, a new phenomenon was observed, where the bubbles owned the various critical motion diameters in different flow regions. Finally, based on the force balance of a bubble on fin tops, a prediction model of critical motion diameter is also proposed. The maximum error is 20%. These findings have an impact on the further development of efficient cooling technology.
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| GB/T 7714 | Guo, Yuming , Fan, Liang-Liang , Zhao, Liang . Flow Patterns of an Open Microchannel and Jet Impingement Hybrid Cooling Scheme [J]. | HEAT TRANSFER ENGINEERING , 2023 . |
| MLA | Guo, Yuming 等. "Flow Patterns of an Open Microchannel and Jet Impingement Hybrid Cooling Scheme" . | HEAT TRANSFER ENGINEERING (2023) . |
| APA | Guo, Yuming , Fan, Liang-Liang , Zhao, Liang . Flow Patterns of an Open Microchannel and Jet Impingement Hybrid Cooling Scheme . | HEAT TRANSFER ENGINEERING , 2023 . |
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Abstract ：
The dynamical characteristics of the shear-driven mixing layer can be inhibited due to the variations in fluid density. In this work we expect to address this issue by increasing shear rate. Direct numerical simulations of mixing layer between two streams with different temperatures at supercritical pressure are conducted. We confirm that the turbulent characteristics of mixing layer are inhibited with increasing density ratio between the lower and upper streams, resulting in the destruction of large-scale vortex, especially at the high-density side. By increasing the velocity ratio between the two streams, however, the mixing performance is enhanced with regeneration of the hairpin vortex due to increase in mean shear. The enstrophy production thus increases due to enhancement of vortex stretching and the thermal mixing efficiency is enhanced due to the entrainment of vortical structures. Further, the streamwise spectra of the temperature fluctuations follow a slope of -3 in the viscous-diffusive range. (C) 2022 Elsevier Ltd. All rights reserved.
Keyword ：
Mixing layer Shear rate Thermal mixing Vortical structure
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| GB/T 7714 | Pei, Binbin , Li, FangBo , Zhao, Kunpeng et al. Enhancement of thermal mixing under supercritical condition by increasing shear rate [J]. | CHEMICAL ENGINEERING SCIENCE , 2022 , 263 . |
| MLA | Pei, Binbin et al. "Enhancement of thermal mixing under supercritical condition by increasing shear rate" . | CHEMICAL ENGINEERING SCIENCE 263 (2022) . |
| APA | Pei, Binbin , Li, FangBo , Zhao, Kunpeng , Zhao, Liang , Bai, Bofeng . Enhancement of thermal mixing under supercritical condition by increasing shear rate . | CHEMICAL ENGINEERING SCIENCE , 2022 , 263 . |
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Abstract ：
Separation of microparticle in viscoelastic fluid is highly required in the field of biology and clinical medicine. For instance, the separation of the target cell from blood is an important prerequisite step for the drug screening and design. The microfluidic device is an efficient way to achieve the separation of the microparticle in the viscoelastic fluid. However, the existing microfluidic methods often have some limitations, including the requirement of the long channel length, the labeling process, and the low throughput. In this work, based on the elastic-inertial effect in the viscoelastic fluid, a new separation method is proposed where a gradually contracted microchannel is designed to efficiently adjust the forces exerted on the particle, eventually achieving the high-efficiency separation of different sized particles in a short channel length and at a high throughput. In addition, the separation of WBCs and RBCs is also validated in the present device. The effect of the flow rate, the fluid property, and the channel geometry on the particle separation is systematically investigated by the experiment. With the advantage of small footprint, simple structure, high throughput, and high efficiency, the present microfluidic device could be utilized in the biological and clinical fields, such as the cell analysis and disease diagnosis.
Keyword ：
elastic-inertial microfluidic particle separation viscoelastic fluid
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| GB/T 7714 | Tian, Zhuang-Zhuang , Gan, Chong-Shan , Fan, Liang-Liang et al. Elastic-inertial separation of microparticle in a gradually contracted microchannel [J]. | ELECTROPHORESIS , 2022 , 43 (21-22) : 2217-2226 . |
| MLA | Tian, Zhuang-Zhuang et al. "Elastic-inertial separation of microparticle in a gradually contracted microchannel" . | ELECTROPHORESIS 43 . 21-22 (2022) : 2217-2226 . |
| APA | Tian, Zhuang-Zhuang , Gan, Chong-Shan , Fan, Liang-Liang , Wang, Ji-Chang , Zhao, Liang . Elastic-inertial separation of microparticle in a gradually contracted microchannel . | ELECTROPHORESIS , 2022 , 43 (21-22) , 2217-2226 . |
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Abstract ：
High volume ratio of cell to droplet is of great importance for the fast detection on the secreted molecule by rapidly increasing the concentration of the molecule to the detectable level. In this paper, small-volume satellite droplet that encapsulates the cell is continuously generated and captured by a T-shaped microchannel with a branching channel to achieve high volume ratio of cell to droplet. The influence of the flow rate of the continuous phase, the channel geometry and the cell concentration on the formation of the satellite droplet is systematically studied by the experiment. The results show that the smallest satellite droplet with size of similar to 6.5 mu m (similar to 0.14 pl in volume) can be generated at a low cell concentration of 16.7% and an average volume ratio of cell to droplet can be achieved as high as similar to 45.9% (the relative standard deviation is 12.9%). With advantages of continuous manipulation and high volume ratio of cell to droplet, the present method could be potentially utilized as a prerequisite step for the fast detection on the secreted molecule.
Keyword ：
droplet formation satellite droplet T-shaped microchannel volume ratio of cell to droplet
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| GB/T 7714 | Zhao, Zhi , Xun, Zhen-Yu , Fan, Liang-Liang et al. Formation and capture of droplet with high volume ratio of cell to droplet [J]. | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2021 , 31 (8) . |
| MLA | Zhao, Zhi et al. "Formation and capture of droplet with high volume ratio of cell to droplet" . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING 31 . 8 (2021) . |
| APA | Zhao, Zhi , Xun, Zhen-Yu , Fan, Liang-Liang , Zhe, Jiang , Zhao, Liang . Formation and capture of droplet with high volume ratio of cell to droplet . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2021 , 31 (8) . |
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Abstract ：
In this paper, based on the mixture flow model, an optimized six-flux model is first established and applied to the tubular solar photocatalytic reactor. Parameters influencing photocatalyst distribution and radiation distribution at the reactor outlet, viz. catalyst concentration and circulation speed, are also analyzed. It is found that, at the outlet of the reactor, the optimized six-flux model has better performances (the energy increase by 1900% and 284%, respectively) with a higher catalyst concentration (triple) and a lower speed (one third).
Keyword ：
flow model numerical simulation photocatalytic hydrogen photoreactor radiation model solar energy
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| GB/T 7714 | Wei, Qingyu , Wang, Yao , Dai, Bin et al. Theoretical study on flow and radiation in tubular solar photocatalytic reactor [J]. | FRONTIERS IN ENERGY , 2021 , 15 (3) : 687-699 . |
| MLA | Wei, Qingyu et al. "Theoretical study on flow and radiation in tubular solar photocatalytic reactor" . | FRONTIERS IN ENERGY 15 . 3 (2021) : 687-699 . |
| APA | Wei, Qingyu , Wang, Yao , Dai, Bin , Yang, Yan , Liu, Haijun , Yuan, Huaijie et al. Theoretical study on flow and radiation in tubular solar photocatalytic reactor . | FRONTIERS IN ENERGY , 2021 , 15 (3) , 687-699 . |
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Abstract ：
A novel microfluidic device for efficient passive mixing is reported. A series of sharp corner structures designed on side wall of an arc microchannel was utilized to induce three-dimensional vortices, which strongly stretched and folded the interface and significantly increased the interfacial contact area between different fluids. Additionally, the sharp corner structure induced high radial velocity and reduced the diffusion length because of the restricted effect of the geometrical structure. Eventually, the fluid mixing was significantly enhanced, and a mixing efficiency from similar to 87% to 92% was achieved at moderate Reynolds number (Re) from 3.0 to 24.2 (10 to 80 mu l min(-1)). The influence of the sharp corner position on the mixing was also investigated by the experiment and the numerical simulation. With single-layer structure and high mixing efficiency, the present device has great potential in the mixing process in variety of lab-chip applications, such as clinic diagnosis and analytic chemistry.
Keyword ：
chaotic advection diffusion mixing sharp corner vortices
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| GB/T 7714 | Huang, Long-Run , Fan, Liang-Liang , Liu, Qi et al. Enhancement of passive mixing via arc microchannel with sharp corner structure [J]. | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2021 , 31 (5) . |
| MLA | Huang, Long-Run et al. "Enhancement of passive mixing via arc microchannel with sharp corner structure" . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING 31 . 5 (2021) . |
| APA | Huang, Long-Run , Fan, Liang-Liang , Liu, Qi , Zhao, Zhi , Zhe, Jiang , Zhao, Liang . Enhancement of passive mixing via arc microchannel with sharp corner structure . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2021 , 31 (5) . |
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Abstract ：
The enrichment and focusing of the nano-/submicroparticle (e.g., 150-1000 nm microvesicle shed from the plasma membrane) in the viscoelastic fluid has great potentials in the biomedical and clinical applications such as the disease diagnosis and the prognostic test for liquid biopsy. However, due to the small size and the resulting weak hydrodynamic force, the efficient manipulation of the nano-/submicroparticle by the passive viscoelastic microfluidic technology remains a major challenge. For instance, a typically long channel length is often required to achieve the focusing or the separation of the nano-/submicroparticle, which makes it difficult to be integrated in small chip area. In this work, a microchannel with gradually contracted cross-section and high aspect ratio (the ratio of the height to the average width of channel) is utilized to enhance the hydrodynamic force and change the force direction, eventually leading to the efficient enrichment of nano-/submicroparticles (500 and 860 nm) in a short channel length (2 cm). The influence of the flow rate, the particle size, the solid concentration, and the channel geometry on the enrichment of the nano-/submicroparticles are investigated. With simple structure, small footprint, easy operation, and good performance, the present device would be a promising platform for various lab-chip microvesicle-related biomedical research and disease diagnosis.
Keyword ：
Enrichment Microfluidic Nanoparticle Submicroparticle Viscoelastic fluid
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| GB/T 7714 | Fan, Liang-Liang , Tian, Zhuang-Zhuang , Zhe, Jiang et al. Efficient microfluidic enrichment of nano-/submicroparticle in viscoelastic fluid [J]. | ELECTROPHORESIS , 2021 , 42 (21-22) : 2273-2280 . |
| MLA | Fan, Liang-Liang et al. "Efficient microfluidic enrichment of nano-/submicroparticle in viscoelastic fluid" . | ELECTROPHORESIS 42 . 21-22 (2021) : 2273-2280 . |
| APA | Fan, Liang-Liang , Tian, Zhuang-Zhuang , Zhe, Jiang , Zhao, Liang . Efficient microfluidic enrichment of nano-/submicroparticle in viscoelastic fluid . | ELECTROPHORESIS , 2021 , 42 (21-22) , 2273-2280 . |
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Abstract ：
To further improve the heat transfer performance and reduce the pressure loss in the internal cooling of gas turbine blade, the flow and heat transfer characteristics of six rib structures in the rectangular channel were numerically studied by CFX software under the Reynolds number of 20 000-80 000. The aspect ratio of the rectangular channel was 4:1, and the rib spacing to rib height ratio (p/e) was 10. The results show that the recirculation zone has a great influence on the heat transfer performance downstream of the rib, and weakening the recirculation zone will reduce the heat transfer performance. The flow-around rib can eliminate the heat transfer deterioration area near the bottom of the leading/trailing edge of the solid rib channel, and the square flow-around rib channel has better thermal performance than the circular flow-around rib channel. For the flow-around rib channels, with the decrease of the rib cross-sectional area reduction ratio ψ, the thermal performance of the channel improves, but the friction factor is increased. The square flow-around ribs with large side-lengths obtain the best thermal performance and heat transfer performance among the ribs studied in this paper. Compared with the solid ribs, the area average Nusselt number of the square flow-around ribs with large side-lengths increases by 0.92%-2.73%, and the friction factor in the heating section decreases by 10.89%-11.01%, which makes the thermal performance factor increase by 4.92%-6.75%. © 2021, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
Keyword ：
Aspect ratio Deterioration Friction Heat transfer performance Reynolds number Turbomachine blades
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| GB/T 7714 | Liang, Zhao , Wang, Xinjun . Numerical Investigation on the Flow and Heat Transfer Characteristics of the Flow-Around Rib Channel [J]. | Journal of Xi'an Jiaotong University , 2021 , 55 (11) : 8-16 . |
| MLA | Liang, Zhao et al. "Numerical Investigation on the Flow and Heat Transfer Characteristics of the Flow-Around Rib Channel" . | Journal of Xi'an Jiaotong University 55 . 11 (2021) : 8-16 . |
| APA | Liang, Zhao , Wang, Xinjun . Numerical Investigation on the Flow and Heat Transfer Characteristics of the Flow-Around Rib Channel . | Journal of Xi'an Jiaotong University , 2021 , 55 (11) , 8-16 . |
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Abstract ：
The dry-out characteristics of boiling flow in the circumferentially non-uniformly heated helically coiled tubes are studied. The experimental parameters are as follows: the heat flux is 15∼55 kW•m-2, the mass flux is 190∼400 kg•m-2•s-1, the pressure is 0.8∼1.1 MPa. The experiments were performed with one uniformly heated tube and two non-uniformly heated tubes. Three helically coiled tubes have the same size and the rations between the maximum and the average heat flux are 1.0, 1.2 and 1.4 respectively. Three differernt kinds of temperature distribution are obtained in present study. The initial dryout position gradually shift to the inner side of the tube with increase of the qmax/qavg and mass flux, and thus cause the initial dry-out quality changes with the mass flux in the non-uniformly heated tubes just opposite to that in the uniform heating tube. © 2020, Science Press. All right reserved.
Keyword ：
Heat flux Temperature distribution Tubes (components)
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| GB/T 7714 | Niu, Xiao-Juan , Yuan, Huai-Jie , Bai, Bo-Feng et al. Dry-out Characteristics of Boiling Flow in the Circumferentially Non-uniformly Heated Helically Coiled Tubes [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2020 , 41 (2) : 380-385 . |
| MLA | Niu, Xiao-Juan et al. "Dry-out Characteristics of Boiling Flow in the Circumferentially Non-uniformly Heated Helically Coiled Tubes" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 41 . 2 (2020) : 380-385 . |
| APA | Niu, Xiao-Juan , Yuan, Huai-Jie , Bai, Bo-Feng , Zhao, Liang . Dry-out Characteristics of Boiling Flow in the Circumferentially Non-uniformly Heated Helically Coiled Tubes . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2020 , 41 (2) , 380-385 . |
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Abstract ：
A new method for continuous separation of microparticles in viscoelastic fluid is reported. A series of sharp corners were fabricated at one side of a microchannel, which induced the curved streamline and the asymmetric distribution of the elastic force. The Newtonian sheath flow was utilized to squeeze microparticles to the side wall with sharp corners at the inlet. Particles were subjected to inertial forces, elastic force and viscous drag force, all of which pointed to the straight wall side. Stronger forces were exerted on larger particles, leading to size-dependent migration of particles across the interface between the Newtonian and the viscoelastic fluids. The influence of the flow rate ratio on the particle separation was also studied. The results show that the sharp corners and the co-flowing fluid system significantly enhanced particle lateral migration, achieving complete particle separation at a low flow rate and in a short channel length. The particle separation efficiency was further increased at a higher flow rate ratio (sheath flow/sample flow). With a simple structure and small footprint, this device has great potential to be used in a variety of particle separation processes for lab-on-a-chip applications.
Keyword ：
microfluidic newtonian fluid particle separation sheath flow viscoelastic fluid
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| GB/T 7714 | Fan, Liang-Liang , Zhao, Zhi , Wu, Xu et al. Continuous elasto-inertial separation of microparticles using a co-flowing Newtonian-viscoelastic fluid system [J]. | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2020 , 30 (1) . |
| MLA | Fan, Liang-Liang et al. "Continuous elasto-inertial separation of microparticles using a co-flowing Newtonian-viscoelastic fluid system" . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING 30 . 1 (2020) . |
| APA | Fan, Liang-Liang , Zhao, Zhi , Wu, Xu , Zhe, Jiang , Zhao, Liang . Continuous elasto-inertial separation of microparticles using a co-flowing Newtonian-viscoelastic fluid system . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2020 , 30 (1) . |
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