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Formation and capture of droplet with high volume ratio of cell to droplet EI SCIE
期刊论文 | 2021 , 31 (8) | JOURNAL OF MICROMECHANICS AND MICROENGINEERING
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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 :

satellite droplet volume ratio of cell to droplet droplet formation T-shaped microchannel

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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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Theoretical study on flow and radiation in tubular solar photocatalytic reactor SCIE CSCD
期刊论文 | 2021 , 15 (3) , 687-699 | FRONTIERS IN ENERGY
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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 :

solar energy flow model photocatalytic hydrogen photoreactor radiation model numerical simulation

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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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Numerical Investigation on the Flow and Heat Transfer Characteristics of the Flow-Around Rib Channel EI
期刊论文 | 2021 , 55 (11) , 8-16 | Journal of Xi'an Jiaotong University
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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 Turbomachine blades Deterioration Heat transfer performance Reynolds number Friction

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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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Efficient microfluidic enrichment of nano-/submicroparticle in viscoelastic fluid SCIE PubMed
期刊论文 | 2021 , 42 (21-22) , 2273-2280 | ELECTROPHORESIS
WoS CC Cited Count: 1
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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 :

Nanoparticle Submicroparticle Enrichment Viscoelastic fluid Microfluidic

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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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Enhancement of passive mixing via arc microchannel with sharp corner structure EI SCIE
期刊论文 | 2021 , 31 (5) | JOURNAL OF MICROMECHANICS AND MICROENGINEERING
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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 :

vortices chaotic advection diffusion sharp corner mixing

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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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Dry-out Characteristics of Boiling Flow in the Circumferentially Non-uniformly Heated Helically Coiled Tubes EI CSCD
期刊论文 | 2020 , 41 (2) , 380-385 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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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 Tubes (components) Temperature distribution

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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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Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube EI SCIE
期刊论文 | 2020 , 234 (15) , 3094-3101 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE | IF: 1.762
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Abstract :

This paper carried out an experimental study on the critical heat flux during flow boiling of R134a in a vertical helically coiled tube. The length, inner diameter, coil diameter, and pitch of the test tube were 1.85 m, 8 mm, 205 mm, and 25 mm, respectively. Experiments cover the mass flux range of 190-400 kg center dot m(-2)center dot s(-1), heat flux of 15-55 kW center dot m(-2), inlet pressure of 0.8-1.1 MPa, and inlet vapor quality of 0.01-0.35. The effects of critical heat flux identification method, mass flux, system pressure, and inlet vapor quality on critical heat flux were presented. The critical heat flux obtained by the wall temperature rise method was larger than that obtained by the wall temperature oscillation method. The deviation of the critical heat flux corresponding to two methods, including wall temperature rises sharply above 10 celcius and wall temperature drastic oscillation, was about 20% under the present experimental conditions. The critical heat flux increased with mass flux while it decreased with the inlet vapor quality and pressure. The experiment data were compared with four existing empirical correlations. A new correlation is proposed for critical heat flux prediction in vertical helical tubes.

Keyword :

flow boiling Helically coiled tube critical heat flux identification method critical heat flux

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GB/T 7714 Niu, Xiaojuan , Yuan, Huaijie , Zhao, Liang . Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE , 2020 , 234 (15) : 3094-3101 .
MLA Niu, Xiaojuan et al. "Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 234 . 15 (2020) : 3094-3101 .
APA Niu, Xiaojuan , Yuan, Huaijie , Zhao, Liang . Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE , 2020 , 234 (15) , 3094-3101 .
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Continuous elasto-inertial separation of microparticles using a co-flowing Newtonian-viscoelastic fluid system EI SCIE
期刊论文 | 2020 , 30 (1) | JOURNAL OF MICROMECHANICS AND MICROENGINEERING | IF: 1.881
WoS CC Cited Count: 2
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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 :

sheath flow viscoelastic fluid particle separation microfluidic newtonian 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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Computational fluid dynamics modeling of reactive multiphase flow for suspended photocatalytic water splitting of hydrogen production system EI SCIE CPCI-S Scopus
期刊论文 | 2020 , 173 | APPLIED THERMAL ENGINEERING | IF: 5.295
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Abstract :

Suspended photocatalytic water splitting for hydrogen production is one of the most promising method for large-scale utilization of renewable energy in the future, and it is a complex reactive multiphase flow system involving radiation field. In this study, a computational fluid dynamics model of reactive multiphase flow for the photocatalytic tubular reactor with solar concentrator used for hydrogen production was developed. This model integrated multiphase flow, radiation field and reaction kinetics in an Eulerian framework using Cd0.5Zn0.5S as photocatalyst, in which the numerical results agreed well with the experimental data. The hydrogen production rate had been developed by the experimental results and expressed in term of a modified Langmuir-Hinshelwood type equation. The intrinsic photocatalytic hydrogen production rate constant independent of radiation intensity, reaction temperature and reactant concentration was obtained, which was 0.328 m(2).W(-1)min(-1). The radiation field inside the reactor was solved by a discrete method combined with the optical properties of the reaction solution. The distribution characteristics of the radiation and multiphase flow inside the reactor were obtained and analyzed. The catalyst particles had different degrees of precipitation in the flow path, especially in the range of -18.04 similar to -20.25 mm along the height direction. The radiation in the reactor was mainly concentrated at the small ranges of 180 degrees +/- 30 degrees and 0 degrees +/- 30 degrees along the circumference. The establishment of the integrated model provides possibilities for the design improvement of photocatalytic reactor and the optimal operation of system in the future.

Keyword :

Photocatalytic water splitting Reactive multiphase flow Computational fluid dynamics

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GB/T 7714 Yang, Yan , Jing, Dengwei , Zhao, Liang . Computational fluid dynamics modeling of reactive multiphase flow for suspended photocatalytic water splitting of hydrogen production system [J]. | APPLIED THERMAL ENGINEERING , 2020 , 173 .
MLA Yang, Yan et al. "Computational fluid dynamics modeling of reactive multiphase flow for suspended photocatalytic water splitting of hydrogen production system" . | APPLIED THERMAL ENGINEERING 173 (2020) .
APA Yang, Yan , Jing, Dengwei , Zhao, Liang . Computational fluid dynamics modeling of reactive multiphase flow for suspended photocatalytic water splitting of hydrogen production system . | APPLIED THERMAL ENGINEERING , 2020 , 173 .
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Experimental Study on the Boiling Heat Transfer Characteristics of R134a in a Helically Coiled Tube EI Scopus CSCD PKU
期刊论文 | 2019 , 40 (3) , 587-593 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

The characteristics of R134a boiling heat transfer in a vertically helically coiled tube are studied. The experimental parameters are as follows: the heat flux is 10∼60 kW•m-2, the mass flux is 195∼400 kg•m-2 •s-1, the pressure is 0.8∼1.1 MPa, and the outlet vapor quality is 0.1∼0.9. The experimental data are compared with the existing correlations of boiling heat transfer coefficient. Based on the analysis of boiling heat transfer mechanism, a new correlation for boiling heat transfer in coiled tube is proposed. The circumferential distribution characteristics of wall temperature and heat transfer coefficient are analyzed. The wall temperatures at inner and top side are relatively higher, and the heat transfer coefficients at the bottom and the outer side are relatively higher. The local heat transfer coefficients are compared with the new correlation proposed in this paper. The results show that the heat transfer coefficients at top and bottom sides can be predicted by the new correlation. However, the new correlation underestimates the heat transfer coefficient at the outer side and overestimates that at the inner side, the deviations are 16.6% and -11.9% respectively. © 2019, Science Press. All right reserved.

Keyword :

Heat flux Heat transfer coefficients

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GB/T 7714 Niu, Xiao-Juan , Yuan, Huai-Jie , Quan, Chen et al. Experimental Study on the Boiling Heat Transfer Characteristics of R134a in a Helically Coiled Tube [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2019 , 40 (3) : 587-593 .
MLA Niu, Xiao-Juan et al. "Experimental Study on the Boiling Heat Transfer Characteristics of R134a in a Helically Coiled Tube" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 40 . 3 (2019) : 587-593 .
APA Niu, Xiao-Juan , Yuan, Huai-Jie , Quan, Chen , Bai, Bo-Feng , Zhao, Liang . Experimental Study on the Boiling Heat Transfer Characteristics of R134a in a Helically Coiled Tube . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2019 , 40 (3) , 587-593 .
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