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Finite element analysis of anti-erosion characteristics of material with patterned surface impacted by particles EI Scopus SCIE
期刊论文 | 2019 , 342 , 193-203 | Powder Technology
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Abstract :

Inspired by the dorsal patterns of living beings in the windy desert, we study the anti-erosion behavior of materials with surface patterns impacted by particles using Finite Element Method (FEM). Using Ti-6Al-4V alloy as the target material and alumina particles as the impact particles, we systematically examine the effects of the impact angle and velocity of particles and target surface with varying surface feature sizes on the erosion mechanism and ant-erosion performance. The simulation results show that the erosion rates against the effective impact angle for our designed surface structures are quite different from those for the flat surface, also suggesting that the effective impact angle concept is insufficient to describe the erosion behavior for curved surfaces. Interestingly, a patterned surface may increase or decrease the erosion rate in comparison with the flat surface. In particular, certain patterned surface structures, which are able to effectively absorb plastic dissipation and thus reduce the damage dissipation, are able to greatly reduce the erosion rate, suggesting that surface pattern can be optimally designed to maximize the anti-erosion performance. © 2018 Elsevier B.V.

Keyword :

Alumina particles Damage dissipation Erosion characteristics Erosion mechanisms Particle erosion Patterned surface Plastic dissipation Velocity of particles

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GB/T 7714 Zhao, Xuebin , Tang, G.H. , Liu, Zhigang et al. Finite element analysis of anti-erosion characteristics of material with patterned surface impacted by particles [J]. | Powder Technology , 2019 , 342 : 193-203 .
MLA Zhao, Xuebin et al. "Finite element analysis of anti-erosion characteristics of material with patterned surface impacted by particles" . | Powder Technology 342 (2019) : 193-203 .
APA Zhao, Xuebin , Tang, G.H. , Liu, Zhigang , Zhang, Yong-Wei . Finite element analysis of anti-erosion characteristics of material with patterned surface impacted by particles . | Powder Technology , 2019 , 342 , 193-203 .
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Steady and transient operation of an organic Rankine cycle power system EI Scopus SCIE
期刊论文 | 2019 , 133 , 284-294 | Renewable Energy
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Abstract :

© 2018 Elsevier Ltd The Organic Rankine Cycle (ORC) driven by low-grade energy can operate in off-grid mode. Here, we report the steady and transient characteristics of an ORC system. A single screw expander and a synchronous generator convert mechanical power to electricity. A lamp array simulates the variable external loads. The quality parameters including electric frequency, electric power and effective voltage are measured by a power meter. We show that at setting frequency of 50 Hz, the maximum system efficiency can be reached when the external load is not larger than the ORC power capacity. The expander isentropic efficiency is above 80% for the vapor superheating of 5–10 K at expander inlet. A control strategy is proposed to achieve better system performance under varied heat source and environment conditions. By use of residual frequency and adjusting pumping frequency, the vapor pressure at expander inlet can be automatically adjusted to reach the optimal value. Transient tests indicate that the electric quality is insensitive to the step change of external loads and heat/cold sources parameters. The thermohydraulic parameters are self-adapted to the change of external parameters. This work provides a self-adapting strategy for ORC operation at varied heat/cold source parameters.

Keyword :

Electric energy quality Organic Rankine cycle Single screw expander Steady state Transient operation

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GB/T 7714 Cao, Shuang , Xu, Jinliang , Miao, Zheng et al. Steady and transient operation of an organic Rankine cycle power system [J]. | Renewable Energy , 2019 , 133 : 284-294 .
MLA Cao, Shuang et al. "Steady and transient operation of an organic Rankine cycle power system" . | Renewable Energy 133 (2019) : 284-294 .
APA Cao, Shuang , Xu, Jinliang , Miao, Zheng , Liu, Xiulong , Zhang, Ming , Xie, Xuewang et al. Steady and transient operation of an organic Rankine cycle power system . | Renewable Energy , 2019 , 133 , 284-294 .
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An improved phase-field-based lattice Boltzmann model for droplet dynamics with soluble surfactant EI
期刊论文 | 2019 , 179 , 508-520 | Computers and Fluids
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We present an improved phase-field model in the lattice Boltzmann scheme to investigate the droplet dynamics in the presence of soluble surfactant. The phase-field model based on the Ginzburg–Landau free energy is developed in which the immiscible binary fluid interfacial profile is independent of the surfactant concentration. The improved model is validated and then employed to study the surfactant effect on single droplet deformation, two droplets interactions and interactions among four droplets in the shear flow. The results show that the increase of surfactant concentration promotes droplet deformation, droplet breakup and more complex droplet-droplet interaction compared to the clean droplet. Moreover, the effects of capillary number, viscosity ratio, as well as peclet number on the behavior of surfactant-covered droplets in the shear flow are investigated. The results indicate that the droplet Taylor deformation parameter increases with the increase of capillary number but the decrease of viscosity ratio. The minimum distance between two interacting droplets enlarges with both capillary number and peclet number. © 2018 Elsevier Ltd

Keyword :

Binary fluids Droplet-droplet interactions Lattice Boltzmann method Lattice boltzmann models Lattice-Boltzmann scheme Phase field models Soluble surfactants Surfactant concentrations

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GB/T 7714 Shi, Y. , Tang, G.H. , Cheng, L.H. et al. An improved phase-field-based lattice Boltzmann model for droplet dynamics with soluble surfactant [J]. | Computers and Fluids , 2019 , 179 : 508-520 .
MLA Shi, Y. et al. "An improved phase-field-based lattice Boltzmann model for droplet dynamics with soluble surfactant" . | Computers and Fluids 179 (2019) : 508-520 .
APA Shi, Y. , Tang, G.H. , Cheng, L.H. , Shuang, H.Q. . An improved phase-field-based lattice Boltzmann model for droplet dynamics with soluble surfactant . | Computers and Fluids , 2019 , 179 , 508-520 .
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Investigation of coalesced droplet vertical jumping and horizontal moving on textured surface using the lattice Boltzmann method EI SCIE Scopus
期刊论文 | 2018 , 75 (4) , 1213-1225 | COMPUTERS & MATHEMATICS WITH APPLICATIONS
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Abstract :

The coalesced droplet vertical jumping and horizontal moving on conical posts textured surface are numerically studied using the three-dimensional (3D) multi-relaxation-time (MRT) pseudopotential lattice Boltzmann model. The influences of wettability gradient and roughness gradient are investigated systematically. It is found that the coalesced droplet on the flat and conical posts textured surfaces can move horizontally from superhydrophobic bend to hydrophobic bend without the roughness gradient. Moreover, the coalesced droplet is able to spontaneously move from lower conical post density region to higher conical post density region without the wettability gradient. Specifically, the in-line array textured surface is more beneficial to the coalesced droplet horizontal moving than the staggered array at the same wettability parameter. However, the staggered array textured surface is more beneficial to the coalesced droplet vertical jumping than the in-line array. The hybrid effect of wettability gradient and roughness gradient plays critical roles in coalesced droplet vertical jumping and horizontal moving. The present work demonstrates that the dropwise condensation heat transfer can be enhanced in a self-sustained manner if the wettability and roughness of the textured surface are properly designed. It is also confirmed that the 3D MRT pseudopotential lattice Boltzmann model is of potential to simulate coalesced droplet behaviors on textured surface. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Lattice Boltzmann method Roughness gradient Wettability gradient Droplet jumping and moving

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GB/T 7714 Shi, Y. , Tang, G. H. . Investigation of coalesced droplet vertical jumping and horizontal moving on textured surface using the lattice Boltzmann method [J]. | COMPUTERS & MATHEMATICS WITH APPLICATIONS , 2018 , 75 (4) : 1213-1225 .
MLA Shi, Y. et al. "Investigation of coalesced droplet vertical jumping and horizontal moving on textured surface using the lattice Boltzmann method" . | COMPUTERS & MATHEMATICS WITH APPLICATIONS 75 . 4 (2018) : 1213-1225 .
APA Shi, Y. , Tang, G. H. . Investigation of coalesced droplet vertical jumping and horizontal moving on textured surface using the lattice Boltzmann method . | COMPUTERS & MATHEMATICS WITH APPLICATIONS , 2018 , 75 (4) , 1213-1225 .
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Molecular dynamics simulation of droplet nucleation and growth on a rough surface: revealing the microscopic mechanism of the flooding mode EI SCIE Scopus
期刊论文 | 2018 , 8 (43) , 24517-24524 | RSC ADVANCES
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Abstract :

Droplet nucleation and growth have a significant influence on dropwise condensation heat transfer. Controlling the droplet nucleation and growth with a high-precision surface to realize the dropwise condensation heat transfer enhancement is a promising method. Molecular dynamics simulation is employed to investigate the effects of heat flux, surface wettability and adjacent droplet size on the new droplet's nucleation and growth. Simulation results indicate that the high heat flux can lead to droplet nucleation and growth inside the rough structure and finally a Wenzel droplet will form due to the coalescence between the inside droplet and the initial existing droplet. However, for a surface with a larger contact angle, the droplet in the Wenzel state will transfer to the Cassie state due to droplet coalescence. In addition, it is also related to the size of the existing droplet whether or not the nucleation process occurs. For the first time, the droplet nucleation radius is introduced to quantitatively determine the droplet nucleation state (inside or outside the nanostructures) and whether the droplet could achieve the state transition from Wenzel to Cassie or not in the growth process.

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GB/T 7714 Niu, Dong , Tang, GuiHua . Molecular dynamics simulation of droplet nucleation and growth on a rough surface: revealing the microscopic mechanism of the flooding mode [J]. | RSC ADVANCES , 2018 , 8 (43) : 24517-24524 .
MLA Niu, Dong et al. "Molecular dynamics simulation of droplet nucleation and growth on a rough surface: revealing the microscopic mechanism of the flooding mode" . | RSC ADVANCES 8 . 43 (2018) : 24517-24524 .
APA Niu, Dong , Tang, GuiHua . Molecular dynamics simulation of droplet nucleation and growth on a rough surface: revealing the microscopic mechanism of the flooding mode . | RSC ADVANCES , 2018 , 8 (43) , 24517-24524 .
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Experimental Study of Heat Transfer and Pressure Drop for H-type Finned Oval Tube with Longitudinal Vortex Generators and Dimples under Flue Gas EI CPCI-S SCIE Scopus
会议论文 | 2018 , 39 (7-8) , 608-616 | 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT)
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Abstract :

To enhance heat transfer and reduce fouling of the finned-tube surface in economizers of coal-fired power plants, heat transfer and pressure drop characteristics for H-type finned oval tube with longitudinal vortex generators (LVG) and dimples, both in-line and staggered arrangements, are studied experimentally under flue dust condition. In addition, the ash samples and heat exchanger surfaces after the test are analyzed to help understanding the ash fouling and tube wear mechanisms. Compared to the original H-type finned oval tube, the Nusselt number of H-type finned oval tube bank with longitudinal vortex generators and dimples is improved by 34.5-41.7% (in-line arrangement) and 28.1-31.7% (staggered arrangement) within the studied Reynolds numbers, while the Euler number is increased by 21.9-28.3% (in-line arrangement) and 19% (staggered arrangement) in the clean finned-tube surface state. In the stable fouling state, the Nusselt number is improved by 37.7-42.3% (in-line arrangement) and 27.8-45.1% (staggered arrangement), while the Euler number is increased by 22.9-25.2% (in-line arrangement) and 33.3-42% (staggered arrangement). The results show that the novel fin structures can both inhibit fouling and enhance heat transfer effectively.

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GB/T 7714 Zhao, Xuebin , Tang, Guihua , Shi, Yuetao et al. Experimental Study of Heat Transfer and Pressure Drop for H-type Finned Oval Tube with Longitudinal Vortex Generators and Dimples under Flue Gas [C] . 2018 : 608-616 .
MLA Zhao, Xuebin et al. "Experimental Study of Heat Transfer and Pressure Drop for H-type Finned Oval Tube with Longitudinal Vortex Generators and Dimples under Flue Gas" . (2018) : 608-616 .
APA Zhao, Xuebin , Tang, Guihua , Shi, Yuetao , Li, Yongkuan . Experimental Study of Heat Transfer and Pressure Drop for H-type Finned Oval Tube with Longitudinal Vortex Generators and Dimples under Flue Gas . (2018) : 608-616 .
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Numerical investigation on the coupling of ash deposition and acid vapor condensation on the H-type fin tube bank EI SCIE Scopus
期刊论文 | 2018 , 139 , 524-534 | APPLIED THERMAL ENGINEERING
SCOPUS Cited Count: 1
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Abstract :

There usually occurs a serious fouling on the heating surface of the low temperature economizer in boilers. The deposited ash on the surface could cause clogging and corrosion of the heat exchanger and even result in serious safety incident. Especially the low temperature bonding ash will corrode the surface severely. The distributions of the low-temperature bonding ash and the loose ash on the surface are numerically simulated in this study based on the theory of the particle transportation model, particle deposition model, force analysis of the particle and the acid point temperature model. The effect of fly ash particles on the content of the acid vapor in the flue gas is considered. Various factors on the distribution of deposited ash are investigated including the particle diameter, flue gas velocity, content of the acid vapor and the tube bank arrangement. The low temperature bonding ash is the largest on the first row tube in the in-line tube bank. However, both modes of deposited ash are largest on the third row tube in the staggered tube bank and they are difficult to remove.

Keyword :

Tube bank Low temperature bonding ash Loose ash Particle diameter Flue gas

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GB/T 7714 Wang, Y. C. , Tang, G. H. . Numerical investigation on the coupling of ash deposition and acid vapor condensation on the H-type fin tube bank [J]. | APPLIED THERMAL ENGINEERING , 2018 , 139 : 524-534 .
MLA Wang, Y. C. et al. "Numerical investigation on the coupling of ash deposition and acid vapor condensation on the H-type fin tube bank" . | APPLIED THERMAL ENGINEERING 139 (2018) : 524-534 .
APA Wang, Y. C. , Tang, G. H. . Numerical investigation on the coupling of ash deposition and acid vapor condensation on the H-type fin tube bank . | APPLIED THERMAL ENGINEERING , 2018 , 139 , 524-534 .
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Numerical investigation on heat transfer of supercritical carbon dioxide in a vertical tube under circumferentially non-uniform heating EI SCIE Scopus
期刊论文 | 2018 , 138 , 354-364 | APPLIED THERMAL ENGINEERING
SCOPUS Cited Count: 3
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Abstract :

Heat transfer characteristics of supercritical carbon dioxide in circumferentially non-uniform heated vertical upward flow near critical point are reported. Stainless steel tube with internal diameter of 38 mm is numerically investigated for mass flow rate from 1000 to 2000 kg/(m(2).s), heat flux from 100 to 400 kW/m(2) and pressure from 81.94 to 150 bar. Circumferential thermal conduction in solid region has a significant impact on non-uniform heating, but a weak impact on uniform heating. Comparisons among the empirical Nusselt correlations for uniform heating show that the Mokry and Gupta correlations can capture severe heat transfer impairment at top generatrix fairly well under non-uniform heating. The existing buoyancy criterions to distinguish forced and mixed convection cannot be applied directly to evaluate buoyancy effect in present conditions. Moreover, the mechanism for severe heat transfer deterioration is discussed. Detailed axial velocity and turbulences show that the buoyancy effect should still be considered even in fully developed forced convection and the turbulent kinetic energy tends to have less impact on heat diffusion. Local thickening of the viscous sublayer reduces the effectiveness of heat diffusion seriously. Meanwhile, the decreasing Prandtl number induced by temperature rise further weakens the heat diffusion in viscous sublayer. Finally, a new heat transfer correlation for non-uniform heating is proposed by introducing the viscosity correction.

Keyword :

Flow acceleration Heat transfer Supercritical carbon dioxide Buoyancy effect Non-uniform heating

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GB/T 7714 Fan, Y. H. , Tang, G. H. . Numerical investigation on heat transfer of supercritical carbon dioxide in a vertical tube under circumferentially non-uniform heating [J]. | APPLIED THERMAL ENGINEERING , 2018 , 138 : 354-364 .
MLA Fan, Y. H. et al. "Numerical investigation on heat transfer of supercritical carbon dioxide in a vertical tube under circumferentially non-uniform heating" . | APPLIED THERMAL ENGINEERING 138 (2018) : 354-364 .
APA Fan, Y. H. , Tang, G. H. . Numerical investigation on heat transfer of supercritical carbon dioxide in a vertical tube under circumferentially non-uniform heating . | APPLIED THERMAL ENGINEERING , 2018 , 138 , 354-364 .
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Rarefaction throttling effect: Influence of the bend in micro-channel gaseous flow EI SCIE Scopus
期刊论文 | 2018 , 30 (8) | PHYSICS OF FLUIDS
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Micro-bends are frequently encountered in micro-electro-mechanical systems as a basic unit of complex geometry. It is essential for a deep understanding of the rarefied gas flow through bent channels. In this paper, a two-dimensional pressure-driven gas flow in a micro-channel with two bends is investigated by solving the Bhatnagar-Gross-Krook kinetic equation via the discrete velocity method in the slip and transition flow regimes. The results show that the mass flow rate (MFR) through the bent channel is slightly higher than that in the straight channel in the slip flow regime but drops significantly as the Knudsen number increases further. It is demonstrated that the increase in MFR is not due to the rarefaction effect but due to the increase in cross section of the bent corners. As the rarefaction effect becomes more prominent, the low-velocity zones at the corners expand and the gas flow is "squeezed" into the inner corner. The narrowed flow section is similar to the throttling effect caused by the valve, and both the changes in MFRs and the pressure distribution also confirm this effect. The classical Knudsen minimum changes due to this "rarefaction throttling effect." The Knudsen number at which the minimum MFR occurs gradually increases with the bend angle and finally disappears in the transition flow regime. In addition, the onset of rarefaction throttling effect shifts to a smaller Knudsen number with a lower tangential momentum accommodation coefficient. Published by AIP Publishing.

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GB/T 7714 Liu, Wei , Tang, Guihua , Su, Wei et al. Rarefaction throttling effect: Influence of the bend in micro-channel gaseous flow [J]. | PHYSICS OF FLUIDS , 2018 , 30 (8) .
MLA Liu, Wei et al. "Rarefaction throttling effect: Influence of the bend in micro-channel gaseous flow" . | PHYSICS OF FLUIDS 30 . 8 (2018) .
APA Liu, Wei , Tang, Guihua , Su, Wei , Wu, Lei , Zhang, Yonghao . Rarefaction throttling effect: Influence of the bend in micro-channel gaseous flow . | PHYSICS OF FLUIDS , 2018 , 30 (8) .
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Thermal-hydraulic-structural Analysis and Design Optimization for Micron-sized Printed Circuit Heat Exchanger EI Scopus CSCD
期刊论文 | 2018 | Journal of Thermal Science
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The Printed Circuit Heat Exchanger (PCHE) is one of the most promising heat exchangers for Synergetic Air-breathing and Rocket Engine (SABRE). To reduce pressure drop and improve compactness, the micron-sized PCHE made up of rectangular channels of tens of microns in size, is used in SABRE. In present work, we focus on thermal-hydraulic-structural characteristics of micron-sized PCHE by conducting three-dimensional (3-D) numerical simulation. Helium and hydrogen are employed as the working fluids and the Stainless Steel 316 (SS316) as the solid substrate. The thermal-hydraulic performance of the micron-sized PCHE is discussed by using the commercial Computational Fluid Dynamics (CFD) software of Fluent. ANSYS-Mechanical is also employed to simulate stress field of representative PCHE channels. The mechanical stress induced by pressure loading and the thermal stress induced by temperature gradient are found to be equally important sources of stress. To improve comprehensive performances of micron-sized PCHE, two types of channel arrangements and different channel aspect ratios are studied. The double banking is of higher thermal-hydraulic performance compared to the single banking while the stress performance is identical for the two modes. Meanwhile, the effect of channel aspect ratio is investigated by comparing thermal-hydraulic characteristics and structural stress of the model. The rectangular channel with w/h=2 achieves the most balanced stress characteristic and higher thermal-hydraulic performance. © 2018, Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature.

Keyword :

channel arrangement Channel aspect ratios Printed circuit heat exchangers Structural analysis and designs Structural characteristics Structural performance Synergetic air-breathing and rocket engines Thermal-hydraulic performance

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GB/T 7714 Hou, Yaqiong , Tang, Guihua . Thermal-hydraulic-structural Analysis and Design Optimization for Micron-sized Printed Circuit Heat Exchanger [J]. | Journal of Thermal Science , 2018 .
MLA Hou, Yaqiong et al. "Thermal-hydraulic-structural Analysis and Design Optimization for Micron-sized Printed Circuit Heat Exchanger" . | Journal of Thermal Science (2018) .
APA Hou, Yaqiong , Tang, Guihua . Thermal-hydraulic-structural Analysis and Design Optimization for Micron-sized Printed Circuit Heat Exchanger . | Journal of Thermal Science , 2018 .
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