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学者姓名:王秋旺

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< Page ,Total 59 >
Adsorption behaviour of NaCl solution on the surface of MgO: a molecular dynamics study EI Scopus SCIE
期刊论文 | 2019 , 117 (3) , 267-279 | Molecular Physics
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Abstract :

Magnesium alloy is one of the most promising biomaterials in vascular clogging and bone injury. But it still has some defects to overcome and the key task is to control the degradation velocity. In this study, the reaction between NaCl solution and MgO is simplified as the first stage of the degradation of magnesium alloy stent, and the adsorption properties of NaCl solution on the MgO surface are investigated by MD simulation. The distribution of each component of the solution perpendicular to the MgO surface is analysed and the diffusion coefficient is calculated. Besides, a parameterised analysis is carried out. The results show that there is a solution layer formed at the surface of the MgO, and the existence of metal oxide restricts the diffusion of the solution. The adsorption capacity and the diffuse rate have an opposite variation tendency with the change of temperature, concentration and velocity. The self-diffusion coefficient of the solution increases with the increase in temperature as well as velocity, inversely adsorption capacity decreases with the increase in velocity. Besides, the influence of temperature on the adsorption capacity is small. What is more, the diffusion coefficient decreases while the adsorption capacity increases with the increase in concentration. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

Keyword :

Adsorption behaviour Adsorption capacities Adsorption properties Change of temperatures Parametric -analysis Self-diffusion coefficients Solution layers Variation tendencies

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GB/T 7714 Tang, Xiaoli , Bian, Qingfei , Wang, Qiuwang et al. Adsorption behaviour of NaCl solution on the surface of MgO: a molecular dynamics study [J]. | Molecular Physics , 2019 , 117 (3) : 267-279 .
MLA Tang, Xiaoli et al. "Adsorption behaviour of NaCl solution on the surface of MgO: a molecular dynamics study" . | Molecular Physics 117 . 3 (2019) : 267-279 .
APA Tang, Xiaoli , Bian, Qingfei , Wang, Qiuwang , Zeng, Min . Adsorption behaviour of NaCl solution on the surface of MgO: a molecular dynamics study . | Molecular Physics , 2019 , 117 (3) , 267-279 .
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Numerical study on a novel hyperbolic inlet header in straight-channel printed circuit heat exchanger EI Scopus SCIE
期刊论文 | 2019 , 146 , 805-814 | Applied Thermal Engineering
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Abstract :

Printed circuit heat exchangers (PCHEs) can be used as the recuperator and condenser in the supercritical CO2 (sCO2) Brayton cycle of fast cooled reactor (FCR) systems. Most researchers focused on heat transfer improvement of the core structure in previous literatures. However, the flow non-uniformity may seriously decrease the comprehensive performance of PCHEs by increasing the pressure loss. The sCO2 temperature in partial channels may be lower than the pseudo-critical temperature due to non-uniform flow distribution. Thereby, it is possible that the condenser may deviate from the steady operating condition and work inefficiently. In this paper, the flow non-uniformity of a straight-channel PCHE condenser with four different inlet headers is analyzed. Based on the streamline profile, a novel modified hyperbolic inlet header is proposed, which can reduce the flow non-uniformity by 46% compared with the current practical manufactured model. Simultaneously, the improvement of flow uniformity by the novel inlet header may increase the overall performance by 39.5%. Furthermore, the effect of core length is also investigated, and it is found that the flow non-uniformity can be minimized by varying the core length. Additionally, the relationship between the standard deviation of flow non-uniformity and the shape factor is quantitatively investigated and analyzed. Result shows that the flow non-uniformity can be expressed as a function of the shape factor and dimensionless core length. Finally, the correlations of the thermo-hydraulic performance of the straight-channel PCHE with corrections for flow non-uniformity are proposed. © 2018

Keyword :

Inlet header Non-uniformities Printed circuit heat exchangers Supercritical CO2 Thermo-hydraulic performance

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GB/T 7714 Chu, Wen-xiao , Bennett, Katrine , Cheng, Jie et al. Numerical study on a novel hyperbolic inlet header in straight-channel printed circuit heat exchanger [J]. | Applied Thermal Engineering , 2019 , 146 : 805-814 .
MLA Chu, Wen-xiao et al. "Numerical study on a novel hyperbolic inlet header in straight-channel printed circuit heat exchanger" . | Applied Thermal Engineering 146 (2019) : 805-814 .
APA Chu, Wen-xiao , Bennett, Katrine , Cheng, Jie , Chen, Yi-tung , Wang, Qiu-wang . Numerical study on a novel hyperbolic inlet header in straight-channel printed circuit heat exchanger . | Applied Thermal Engineering , 2019 , 146 , 805-814 .
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Experimental study of forced convective heat transfer in grille-particle composite packed beds EI Scopus SCIE
期刊论文 | 2019 , 129 , 103-112 | International Journal of Heat and Mass Transfer
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Due to high surface area-to-volume ratio and superior thermal performance, packed beds are widely used in variety of industries. In the present study, forced convective heat transfer in a novel grille-particle composite packing (GPCP) bed, was experimentally investigated in pursuit of reduced pressure drop and enhanced overall heat transfer. The effects of sub-channel to particle diameter ratio, grille thickness and grille thermal conductivity on pressure drop, Nusselt number and overall heat transfer efficiency in the grille-particle channel were carefully analyzed. And performances of grille-particle channels were compared with those of random particle channels in detail. It is shown that looser packing structure compromises heat transfer in the grille-particle channel, while decreasing pressure drop and improving overall heat transfer efficiency. Meanwhile, for the same Reynolds number and particle diameter, higher grille thermal conductivity and thinner grille thickness also improve overall heat transfer performance. Finally, when compared with random packing, both pressure drop and heat transfer in grille-particle channels are shown to be reduced, while overall heat transfer efficiency is improved, especially when employing relatively small particle diameters. © 2018 Elsevier Ltd

Keyword :

Forced convective heat transfer Heat transfer efficiency Overall heat transfer performance Packing structure Particle composites Particle diameters Random packing Thermal Performance

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GB/T 7714 Hu, Yingxue , Wang, Jingyu , Yang, Jian et al. Experimental study of forced convective heat transfer in grille-particle composite packed beds [J]. | International Journal of Heat and Mass Transfer , 2019 , 129 : 103-112 .
MLA Hu, Yingxue et al. "Experimental study of forced convective heat transfer in grille-particle composite packed beds" . | International Journal of Heat and Mass Transfer 129 (2019) : 103-112 .
APA Hu, Yingxue , Wang, Jingyu , Yang, Jian , Mudawar, Issam , Wang, Qiuwang . Experimental study of forced convective heat transfer in grille-particle composite packed beds . | International Journal of Heat and Mass Transfer , 2019 , 129 , 103-112 .
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Study on chemical spray etching of stainless steel for printed circuit heat exchanger channels EI Scopus SCIE
期刊论文 | 2019 , 341 , 91-99 | Nuclear Engineering and Design
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Abstract :

© 2018 Elsevier B.V. Nuclear power is considered as the most promising energy for power generation due to low carbon emission, small fuel cost, high efficiency and reliability. As a new type of heat exchanger, printed circuit heat exchanger (PCHE) with high compactness and efficiency can be used for the supercritical carbon dioxide (SCO2) Brayton power cycle in the Gen IV nuclear reactor systems to transfer great amount of heat from nuclear reactors. The chemical etching technology plays an important role in production of heat transfer channels for PCHEs from micron level to millimeter level. In order to produce high-quality heat transfer channels, the chemical spray etching method is used in the manufacturing process. In this work, a chemical spray etching experiment was carried out to analyse the etching phenomenon on the PCHE channels. The influences of etching parameters, such as etching rate, lateral erosion, surface roughness, etc., are investigated. The results showed that the etching parameters significantly affected the etching quality, which provided comprehensive view of details for the etching process. Besides, an orthogonal array testing strategy (OATS) was adopted for chemical spray etching to synthetically study the influences of FeCl3 and H3PO4 concentrations, etching temperature, spray pressure on the etching rate, the lateral erosion and the surface roughness. The optimal combination of etching parameters in the setting level was investigated and obtained, which is in the condition with spray gage pressure of 0.15 MPa, etching temperature of 35 °C, FeCl3 concentration of 400 g·L−1 and H3PO4 concentration of 1.5 M. The present work is of significance to realize the low-cost, high-efficiency and controllable manufacturing process of PCHEs.

Keyword :

Chemical reaction Etching factor Etching rate Printed circuit heat exchanger Spray etching Surface roughness

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GB/T 7714 Xin, Fei , Ma, Ting , Chen, Yitung et al. Study on chemical spray etching of stainless steel for printed circuit heat exchanger channels [J]. | Nuclear Engineering and Design , 2019 , 341 : 91-99 .
MLA Xin, Fei et al. "Study on chemical spray etching of stainless steel for printed circuit heat exchanger channels" . | Nuclear Engineering and Design 341 (2019) : 91-99 .
APA Xin, Fei , Ma, Ting , Chen, Yitung , Wang, Qiuwang . Study on chemical spray etching of stainless steel for printed circuit heat exchanger channels . | Nuclear Engineering and Design , 2019 , 341 , 91-99 .
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Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method EI CPCI-S SCIE Scopus
会议论文 | 2018 , 222 , 92-103 | 9th International Conference on Applied Energy (ICAE)
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

Latent heat thermal energy storage (LTES) has been recommended to complicated aerospace systems due to the excellent ability of storing thermal energy in recent years. Metal foam, as an effective additive to enhance the effective thermal conductive coefficient of phase change materials, has been wildly used in the LTES system. In support of the future space exploration, solid-liquid phase change within metal foam under different gravitational accelerations and corresponding heat transfer characteristics are investigated in this work to enhance understanding of heat transfer capability in reduced gravity conditions. A pore-scale lattice Boltzmann method with the double distribution functions is developed to study the solid-liquid phase change problems with the natural convection heat transfer in metal foam. Here, microstructure of metal foam is experimentally obtained by the use of X-ray computed tomography. Two numerical validation cases are performed, one for fluid-solid conjugate heat transfer problem, and the other for melting process in a square cavity without the porous media. The presented lattice Boltzmann results are in good agreement with previous analytical and numerical results. Based on the analysis of temperature and velocity fields during melting within metal foam, it is found that the clockwise circulation, caused by the temperature gradient, leads to the inhomogeneous distribution of liquid-solid interface along vertical direction. What's more, gravity effects on the temperature and velocity fields together with the average Nusselt number and liquid fraction coefficient are investigated. Results show that with the decrease of gravitational accelerations from 1g to 0g, the maximum vertical velocity reduces and the thickness of velocity boundary layer thickens accordingly, and results in the pronounced reduction of average Nusselt number and melting rate. The natural convection appears to be even more tenuous as gravitational acceleration decreases, leading to the dominant heat transfer mechanism transited from convection to conduction, and finally alleviating the phase change process. The liquid fraction under 0g, 0.01g and 0.1g conditions are 54.6%, 58.9% and 67.9% respectively of that under 1g conditions at Fo = 0.06. In addition, porosity effects on phase change heat transfer characteristics are discussed by comparing the liquid fraction with porosity of 0.9, 0.94 and 1. It is found that metal foam with lower porosity shows higher effective thermal conductivity and outstanding heat transfer performance, while the restriction on natural convection should not be neglected, especially for melting region which is dominated by natural convection.

Keyword :

Lattice Boltzmann method Pore scale Metal foam Phase change Gravity effect

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GB/T 7714 Li, Xinyi , Ma, Ting , Liu, Jun et al. Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method [C] . 2018 : 92-103 .
MLA Li, Xinyi et al. "Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method" . (2018) : 92-103 .
APA Li, Xinyi , Ma, Ting , Liu, Jun , Zhang, Hao , Wang, Qiuwang . Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method . (2018) : 92-103 .
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Investigation of hydrodynamic and heat transfer performances in grille-sphere composite pebble beds with DEM-CFD-Taguchi method EI CPCI-S SCIE Scopus
会议论文 | 2018 , 155 , 909-920 | 20th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES)
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

In the present paper, grille-sphere composite pebble bed (GSCPB) is developed to improve the hydrodynamic and heat transfer performances for high temperature gas cooled reactor with 10 MW (HTR-10). The fluid flow and heat transfer characteristics in typical GSCPB channels are numerically investigated, and the effects of typical parameters on the pressure drop and maximum pebble temperature inside are carefully analyzed with Taguchi method. Firstly, in the GSCPB bed, the grille can not only support the pebbles to achieve a structured packing quickly, but can also enhance convective heat transfer from pebbles to the fluid. With proper design of grille inside, the heat transfer rate would be improved and the pressure drop would be reduced in GSCPB channel when compared with traditional random pebble bed. Secondly, the effect of sub-channel width to pebble diameter ratio (N) on both the hydrodynamic and heat transfer performances in GSCPB channel is quite significant. The contribution ratios of N on the pressure drop and maximum pebble temperature in GSCPB channel are of 86.3% and 81.0%, respectively. Finally, with Taguchi method, the optimum design parameter combinations are obtained for the lowest pressure drop and lowest maximum pebble temperature in GSCPB channels, respectively. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Computational fluid dynamics Heat transfer Grille-sphere composite packing Pebble bed Discrete element method Taguchi method

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GB/T 7714 Hu, Yingxue , Yang, Jian , Wang, Jingyu et al. Investigation of hydrodynamic and heat transfer performances in grille-sphere composite pebble beds with DEM-CFD-Taguchi method [C] . 2018 : 909-920 .
MLA Hu, Yingxue et al. "Investigation of hydrodynamic and heat transfer performances in grille-sphere composite pebble beds with DEM-CFD-Taguchi method" . (2018) : 909-920 .
APA Hu, Yingxue , Yang, Jian , Wang, Jingyu , Wang, Qiuwang . Investigation of hydrodynamic and heat transfer performances in grille-sphere composite pebble beds with DEM-CFD-Taguchi method . (2018) : 909-920 .
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Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases CPCI-S SCIE Scopus
会议论文 | 2018 , 160 , 3-18 | 20th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES)
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

The waste heat of high temperature exhaust flue gases is widely distributed in many industrial processes. Recovery of waste heat is of great significance to energy saving and sustainability. In this paper, a novel high temperature heat exchanger with hybrid enhancement technologies is proposed to improve waste heat recovery efficiency based on the cascade recovery and utilization method. Algorithm for HTHE structural design and optimization is developed and verified according to the experimental results. Heat transfer and pressure drop performance of the proposed HTHE are estimated by using the algorithm. The results show that the effectiveness of the proposed HTHE increases as the gas temperature increases and mass flow rate decreases. Average effectiveness of the proposed HTHE and temperature of preheated air are 12.5% and 85.8 degrees C higher than those of traditional HTHE with additional 70.0% and 22.0% pressure drop on air and gas sides, respectively. The structural optimization of the proposed HTHE is carried out and it shows that the optimized HTHE has better heat transfer capacity and comprehensive performance under identical pressure drop, increasing effectiveness by 12.6% without enlarging pressure drop compared with the non-optimized HTHE. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Twisted tape inserts Internal and external fins High temperature heat exchanger Waste heat recovery Design and optimization

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GB/T 7714 Zhang, Pan , Ma, Ting , Li, Wei-Dong et al. Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases [C] . 2018 : 3-18 .
MLA Zhang, Pan et al. "Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases" . (2018) : 3-18 .
APA Zhang, Pan , Ma, Ting , Li, Wei-Dong , Ma, Guang-Yu , Wang, Qiu-Wang . Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases . (2018) : 3-18 .
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PREFACE: HEAT TRANSFER ADVANCES FOR ENERGY CONSERVATION AND POLLUTION CONTROL SCIE
期刊论文 | 2018 , 49 (11) , V-VI | HEAT TRANSFER RESEARCH
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GB/T 7714 Hung, Tzu-Chen , Wang, Qiu-Wang , Chen, Yitung et al. PREFACE: HEAT TRANSFER ADVANCES FOR ENERGY CONSERVATION AND POLLUTION CONTROL [J]. | HEAT TRANSFER RESEARCH , 2018 , 49 (11) : V-VI .
MLA Hung, Tzu-Chen et al. "PREFACE: HEAT TRANSFER ADVANCES FOR ENERGY CONSERVATION AND POLLUTION CONTROL" . | HEAT TRANSFER RESEARCH 49 . 11 (2018) : V-VI .
APA Hung, Tzu-Chen , Wang, Qiu-Wang , Chen, Yitung , Guo, Zhixiong . PREFACE: HEAT TRANSFER ADVANCES FOR ENERGY CONSERVATION AND POLLUTION CONTROL . | HEAT TRANSFER RESEARCH , 2018 , 49 (11) , V-VI .
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Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio EI SCIE Scopus
期刊论文 | 2018 , 11 (4) | ENERGIES
SCOPUS Cited Count: 1
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Abstract :

Packed beds are widely used in catalytic reactors or nuclear reactors. Reducing the pressure drop and improving the heat transfer performance of a packed bed is a common research aim. The dimpled structure has a complex influence on the flow and heat transfer characteristics. In the present study, the flow and heat transfer characteristics in structured packed beds with smooth or dimpled spheres are numerically investigated, where two different low channel to particle diameter ratios (N = 1.00 and N = 1.15) are considered. The pressure drop and the Nusselt number are obtained. The results show that, for N = 1.00, compared with the structured packed bed with smooth spheres, the structured packed bed with dimpled spheres has a lower pressure drop and little higher Nusselt number at 1500 < Re-H < 14,000, exhibiting an improved overall heat transfer performance. However, for N = 1.15, the structured packed bed with dimpled spheres shows a much higher pressure drop, which dominantly affects the overall heat transfer performance, causing it to be weaker. Comparing the different channel to particle diameter ratios, we find that different configurations can result in: (i) completely different drag reduction effect; and (ii) relatively less influence on heat transfer enhancement.

Keyword :

dimpled sphere numerical simulation low channel to particle diameter ratio pressure drop structured packed bed Nusselt number

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GB/T 7714 Li, Shiyang , Zhou, Lang , Yang, Jian et al. Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio [J]. | ENERGIES , 2018 , 11 (4) .
MLA Li, Shiyang et al. "Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio" . | ENERGIES 11 . 4 (2018) .
APA Li, Shiyang , Zhou, Lang , Yang, Jian , Wang, Qiuwang . Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio . | ENERGIES , 2018 , 11 (4) .
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Force Analysis of a Circular Cylinder at Ununiformed Flow in a T Pipe Junction EI SCIE Scopus
期刊论文 | 2018 , 11 (4) | ENERGIES
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Experimental and numerical investigations of force analysis acted on single circular cylinder in the T pipe junction with the effect of vanes are reported in this paper. Experiments are carried on in a small wind tunnel at five different velocity ratios (R) from 0.117 to 0.614. The mean pressure data acted on the cylinder are obtained and in turn the drag and lift. Vanes are installed at the junction to change the secondary flow in the suction duct and the angle is in the range of 90 degrees <= phi <= 130 degrees. Numerical studies which are validated by the experimental data help understand the flow structure for the analysis. It is found that in the T shape junction without vanes, the cylinder presents different surface mean pressure distributions at the different positions in the suction duct. As the increase of the distance from the junction to the cylinder center, the surface mean pressure distributions recover to the benchmark gradually which performs in the straight duct beforehand. Four feature points including the front/rear stagnation points and the separation points and the corresponding three divisions of flow region are analyzed in detail with the auxiliary numerical simulation of flow structure. Effect of the vanes with different angle is also discussed. Finally, the drag and lift coefficients acted on the cylinder with or without vanes are performed.

Keyword :

T pipe junction force analysis ununiformed flow vanes circular cylinder

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GB/T 7714 Yin, Yantao , Li, Shicong , Wang, Liangbi et al. Force Analysis of a Circular Cylinder at Ununiformed Flow in a T Pipe Junction [J]. | ENERGIES , 2018 , 11 (4) .
MLA Yin, Yantao et al. "Force Analysis of a Circular Cylinder at Ununiformed Flow in a T Pipe Junction" . | ENERGIES 11 . 4 (2018) .
APA Yin, Yantao , Li, Shicong , Wang, Liangbi , Lin, Mei , Wang, Qiuwang . Force Analysis of a Circular Cylinder at Ununiformed Flow in a T Pipe Junction . | ENERGIES , 2018 , 11 (4) .
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