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< Page ,Total 95 >
Study on nucleation position and wetting state for dropwise condensation on rough structures with different wettability using multiphase lattice Boltzmann method EI
期刊论文 | 2019 , 96-100 | International Journal of Heat and Mass Transfer
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Abstract :

Dropwise condensation on rough structures with different wettability are numerically simulated using Lattice Boltzmann method. The latent heat during condensation process together with the energy equation is taken into consideration in this paper by solving the temperature distribution equation with a source term for the phase change. Typical droplet nucleation positions and wetting states are found out at different surface wettability through numerical results. It is concluded that with the increase of strength coefficient of the fluid-solid interaction or surface hydrophobicity, the nucleation position rises from the bottom to top of the pillar, and the wetting state of droplet changes from the wetting Wenzel state to the nonwetting Cassie one. © 2018

Keyword :

Condensation process Dropwise condensation Fluid solid interaction Lattice Boltzmann method Multi-phase lattice Boltzmann method Strength coefficients Surface hydrophobicity Surface wettability

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GB/T 7714 Li, Mingjie , Huber, Christian , Tao, Wenquan et al. Study on nucleation position and wetting state for dropwise condensation on rough structures with different wettability using multiphase lattice Boltzmann method [J]. | International Journal of Heat and Mass Transfer , 2019 : 96-100 .
MLA Li, Mingjie et al. "Study on nucleation position and wetting state for dropwise condensation on rough structures with different wettability using multiphase lattice Boltzmann method" . | International Journal of Heat and Mass Transfer (2019) : 96-100 .
APA Li, Mingjie , Huber, Christian , Tao, Wenquan , Wei, Jinjia . Study on nucleation position and wetting state for dropwise condensation on rough structures with different wettability using multiphase lattice Boltzmann method . | International Journal of Heat and Mass Transfer , 2019 , 96-100 .
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A sharp-interface model coupling VOSET and IBM for simulations on melting and solidification EI Scopus SCIE
期刊论文 | 2019 , 178 , 113-131 | Computers and Fluids
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Abstract :

This article presents a sharp-interface model for solving solid-liquid phase change of pure materials. An interface capturing method combining VOF and level set, VOSET, is employed to track the moving interface during phase change, and the level-set function generated in VOSET is used to consider the effect of the phase boundary when solving the fields of temperature and velocity. In order to deal with the interaction between the solid and liquid phases, an immersed boundary method (IBM) is incorporated into SIMPLER algorithm. The fundamental numerical approaches presented in this article were individually assessed by test problems, all showing good agreements with benchmark solutions. The established sharp-interface model was then applied in simulating melting and solidification without and with fluid flow, where competitive performance in accuracy was demonstrated by the numerical results. © 2018 Elsevier Ltd

Keyword :

Competitive performance Immersed boundary methods Interface-capturing method Melting and solidification Numerical approaches Sharp interface model Solid liquid phase change VOSET

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GB/T 7714 Ling, Kong , Tao, Wen-Quan . A sharp-interface model coupling VOSET and IBM for simulations on melting and solidification [J]. | Computers and Fluids , 2019 , 178 : 113-131 .
MLA Ling, Kong et al. "A sharp-interface model coupling VOSET and IBM for simulations on melting and solidification" . | Computers and Fluids 178 (2019) : 113-131 .
APA Ling, Kong , Tao, Wen-Quan . A sharp-interface model coupling VOSET and IBM for simulations on melting and solidification . | Computers and Fluids , 2019 , 178 , 113-131 .
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Heat transfer correlations of refrigerant falling film evaporation on a single horizontal smooth tube EI
期刊论文 | 2019 , 96-106 | International Journal of Heat and Mass Transfer
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Abstract :

Falling film evaporation heat transfer of R134a and its potential substitutes R290 and R600a outside a single horizontal plain tube is experimentally investigated, and the effects of the saturation temperature, film flow rate and heat flux on heat transfer coefficient are studied. Heat transfer performance of R290 is slightly superior than that of R134a, while R600a is inferior than that of R134a. The threshold film Reynolds number is determined to separate the variation trend of HTC with film Reynolds number into full wetting and partial dryout regimes. Increase of heat flux benefits the heat transfer in both full-wetting and partial dry-out regimes. New heat transfer correlations based on the present data and data for R32 and R1234ze(E) in the authors’ group are suggested for two regimes. The correlation for full wetting regime fits 96.7% of the total 542 correlated data within ±30% while fits 73.4% of the total 289 data in references from −30% to +15%, the correlation for partial dryout regime fits 97.5% of the total 162 correlated data within ±30% while fits 76.8% of the total 95 data from references within ±30%. © 2018

Keyword :

Correlated data Falling-film evaporation Film flow rate Heat transfer correlation Heat transfer performance Horizontal smooth tubes Plain tubes Saturation temperature

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GB/T 7714 Jin, Pu-Hang , Zhang, Zhuo , Mostafa, Ibrahim et al. Heat transfer correlations of refrigerant falling film evaporation on a single horizontal smooth tube [J]. | International Journal of Heat and Mass Transfer , 2019 : 96-106 .
MLA Jin, Pu-Hang et al. "Heat transfer correlations of refrigerant falling film evaporation on a single horizontal smooth tube" . | International Journal of Heat and Mass Transfer (2019) : 96-106 .
APA Jin, Pu-Hang , Zhang, Zhuo , Mostafa, Ibrahim , Zhao, Chuang-Yao , Ji, Wen-Tao , Tao, Wen-Quan . Heat transfer correlations of refrigerant falling film evaporation on a single horizontal smooth tube . | International Journal of Heat and Mass Transfer , 2019 , 96-106 .
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Application and numerical error analysis of multiscale method for air flow, heat and pollutant transfer through different scale urban areas EI
期刊论文 | 2019 , 149 , 349-365 | Building and Environment
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Abstract :

There is an increasing concern on the effect of the outdoor environment on the indoor air quality (IAQ) through ventilation. In urban areas, the physical phenomenon that the air pollutants pass over the neighborhood scale–street scale–indoor scale, and affect the health of the residents belongs to multiscale problems. The adopted multiscale method models the problem in nesting grid system approach by solving from top (entire domain with relative coarse grids) to down (subsequent sub-domains with finer grid). In this paper, a 3-D multiscale model with Richardson number (Ri) equal to 0.85 was firstly established to investigate the above multiscale phenomenon, then evaluated by comparing with the full-scale intensive simulation, since our previous study showed that when Ri ≤ 0.85 the standard k-ɛ turbulence model can better predict the flow and temperature fields. The numerical error analysis of the multiscale method was conducted by considering the effects of two aspects (boundary condition interpolation schemes and sub-domain partitioning) on the regularity of error production and transfer. Results show that the applied multiscale method can save 83.8% computing time. Furthermore, it can be concluded that among the three interpolation schemes for the boundary reconstruction the linear and spline interpolation methods are appropriate while the nearest method should not be applied because of its 1st-order accuracy. If insensitive interfaces are chosen as the partitioning interfaces of the lower-scale domain the computational accuracy of the multiscale method can be greatly improved. © 2018

Keyword :

Buoyancy flow Multiscale method Numerical error analysis Pollutant dispersions Wind tunnel measurements

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GB/T 7714 Cui, Peng-Yi , Zhang, Yan , Zhang, Jin-Hao et al. Application and numerical error analysis of multiscale method for air flow, heat and pollutant transfer through different scale urban areas [J]. | Building and Environment , 2019 , 149 : 349-365 .
MLA Cui, Peng-Yi et al. "Application and numerical error analysis of multiscale method for air flow, heat and pollutant transfer through different scale urban areas" . | Building and Environment 149 (2019) : 349-365 .
APA Cui, Peng-Yi , Zhang, Yan , Zhang, Jin-Hao , Huang, Yuan-Dong , Tao, Wen-Quan . Application and numerical error analysis of multiscale method for air flow, heat and pollutant transfer through different scale urban areas . | Building and Environment , 2019 , 149 , 349-365 .
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Numerical prediction of thermal contact resistance of 3D C/C-SiC needled composites based on measured practical topography EI
期刊论文 | 2019 , 176-188 | International Journal of Heat and Mass Transfer
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Abstract :

The 3D C/C-SiC composite is a kind of widely used material in thermal protection system or other functional parts of the hypersonic vehicles. This paper conducts numerical simulation to predict the thermal contact resistance of the 3D C/C-SiC needled composite pairs. The practical surface topography is measured by a 3D optical microscope named Bruker Contour GT-K, and the rough surfaces for simulation are reconstructed in ANSA software with the help of Python code. The measured arithmetical mean roughness (Ra) of the two specimens are 12.04 μm and 11.75 μm respectively. The prediction is divided into two steps, static analysis for revealing the contact spot distribution of the contact interfaces, and thermal analysis for the temperature distribution of the contact interfaces to calculate the thermal contact resistance. Both two steps are finished with Abaqus. The prediction results show that actual contact area only occupies a small part of nominal contact area (when pressure is 5.52 MPa, the actual contact area just accounts for 7% of the nominal contact area), and the dependency curve approximately shows linearity between the proportion of actual contact area to nominal contact area and loading pressure. Besides, thermal contact resistance decreases with an increase in loading pressure and temperature. Thermal contact resistances of the studied composite materials are in the order of 6 × 10−4–1.2 × 10−3 K·m2·W−1. © 2018 Elsevier Ltd

Keyword :

3d optical microscopes Arithmetical mean Contact interface Functional parts Loading pressures Numerical predictions Thermal contact resistance Thermal Protection System

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GB/T 7714 Ren, Xing-Jie , Dai, Yan-Jun , Gou, Jian-Jun et al. Numerical prediction of thermal contact resistance of 3D C/C-SiC needled composites based on measured practical topography [J]. | International Journal of Heat and Mass Transfer , 2019 : 176-188 .
MLA Ren, Xing-Jie et al. "Numerical prediction of thermal contact resistance of 3D C/C-SiC needled composites based on measured practical topography" . | International Journal of Heat and Mass Transfer (2019) : 176-188 .
APA Ren, Xing-Jie , Dai, Yan-Jun , Gou, Jian-Jun , Tao, Wen-Quan . Numerical prediction of thermal contact resistance of 3D C/C-SiC needled composites based on measured practical topography . | International Journal of Heat and Mass Transfer , 2019 , 176-188 .
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The study on interface characteristics near the metal wall by a molecular dynamics method EI SCIE Scopus
期刊论文 | 2018 , 164 , 64-72 | COMPUTERS & FLUIDS
SCOPUS Cited Count: 1
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Abstract :

The condensation process of the multiple-atom and polar water molecular at a solid wall is studied. It is found that a monomolecular layer structure is existed on the wall surface and the intensity of solid-liquid potential can be revealed by the monomolecular density peak. At high-temperature conditions, liquid drop in vapor and bubble near wall can be observed. The solid-liquid potential energy on monomolecular layer structure has a greater impact than on gas-liquid interface. The simulated densities in the vapor region are consistent with the macroscopic values by refprop8.0, while in the liquid region the simulated densities are a bit lower than the macroscopic ones. Besides, the solid-liquid-gas three-phase model consisting of argon, water, freon and copper was constructed using Materials Studio software, and their interface characteristics are studied. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Interface characteristic Condensation process Solid wall Materials studio Three-phase model Molecular dynamics

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GB/T 7714 Chen, Lei , Chen, Peng-Fei , Li, Zhong-Zhen et al. The study on interface characteristics near the metal wall by a molecular dynamics method [J]. | COMPUTERS & FLUIDS , 2018 , 164 : 64-72 .
MLA Chen, Lei et al. "The study on interface characteristics near the metal wall by a molecular dynamics method" . | COMPUTERS & FLUIDS 164 (2018) : 64-72 .
APA Chen, Lei , Chen, Peng-Fei , Li, Zhong-Zhen , He, Ya-Ling , Tao, Wen-Quan . The study on interface characteristics near the metal wall by a molecular dynamics method . | COMPUTERS & FLUIDS , 2018 , 164 , 64-72 .
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EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL CPCI-S SCIE
会议论文 | 2018 , 49 (11) , 1003-1022 | 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT)
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Abstract :

Nucleate boiling heat transfer (NBHT) from enhanced structures is an effective way to dissipate a high heat flux. In the present study, the behavior of cavities with nucleation on roughened surfaces is studied numerically during the entire ebullition cycle based on the phase-change lattice Boltzmann method. The adopted model is firstly validated by the Laplace law and the two-phase coexistence curve and then is applied to investigate the effects of the cavity structure on NBHT. The bubble departure diameter, departure frequency, and the total boiling heat flux of the ebullition cycle are also studied. It is shown that the cavity widths and the cavity grooves exhibit a significant influence on the NBHT features. A cavity with a circular groove in the present research shows the best performance for NBHT in terms of the averaged heat flux and bubble release frequency. When a specific cavity is combined with other different cavities on roughened surfaces, its nucleation process on different roughened surfaces may differ greatly.

Keyword :

lattice Boltzmann method bubble dynamics cavity groove nucleate boiling

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GB/T 7714 Mu, Yu-Tong , Chen, Li , Kang, Qin-Jun et al. EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL [C] . 2018 : 1003-1022 .
MLA Mu, Yu-Tong et al. "EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL" . (2018) : 1003-1022 .
APA Mu, Yu-Tong , Chen, Li , Kang, Qin-Jun , Tao, Wen-Quan . EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL . (2018) : 1003-1022 .
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Influences of the perforation on effective transport properties of gas diffusion layers EI SCIE Scopus
期刊论文 | 2018 , 126 , 243-255 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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In this paper, the through-plane and in-plane effective transport properties, including permeability, diffusivity and thermal conductivity, of the perforated gas diffusion layer (GDL) are predicted using multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) based on stochastic reconstructed microstructures. When predicting effective thermal conductivities of GDL, the effect of anisotropic conductive property of fibers is considered. The effective transport properties of dry perforated GDL are fitted as a function of perforation diameter and porosity. It is found that the permeability and effective diffusivity of GDL increase with perforation diameter and porosity while the effective thermal conductivity decreases. The two-phase LBM is adopted to simulate water distributions in perforated GDLs, and dependences of effective transport properties on saturation are then obtained. The results show that: the existence of the perforation significantly affects the water transport in hydrophobic perforated GDLs if its diameter is larger than the average pore size of GDL. The effective permeability and diffusivity of GDL decrease while effective thermal conductivity increases with saturation. The effective transport properties of perforated GDLs change less significantly with saturation than those of non-perforated GDL if the water droplet intruding into the perforation is displaced, while change more rapidly with saturation if the water droplet remains inside the perforation. (C) 2018 Published by Elsevier Ltd.

Keyword :

Multiple-relaxation-time Lattice Boltzmann method Saturation Gas diffusion layer Effective transport property Perforation

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GB/T 7714 Fang, Wen-Zhen , Tang, Yu-Qing , Chen, Li et al. Influences of the perforation on effective transport properties of gas diffusion layers [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 126 : 243-255 .
MLA Fang, Wen-Zhen et al. "Influences of the perforation on effective transport properties of gas diffusion layers" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 126 (2018) : 243-255 .
APA Fang, Wen-Zhen , Tang, Yu-Qing , Chen, Li , Kang, Qin-Jun , Tao, Wen-Quan . Influences of the perforation on effective transport properties of gas diffusion layers . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 126 , 243-255 .
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A hybrid flux splitting method for compressible flow EI SCIE Scopus
期刊论文 | 2018 , 73 (1) , 33-47 | NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
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A hybrid flux splitting scheme, called AUSM(+)-FVS((advection upstream splitting method)(+)-flux vector splitting), is proposed in this article to calculate the inviscid fluxes of Euler/Navier-Stokes equations. This new scheme is obtained by hybridizing the AUSM+ scheme with FVS method. When the local Mach number tends to zero, this scheme is similar to the AUSM+. Contrarily, this scheme is similar to the FVS at the shock region. Thus, this scheme has the accuracy of AUSM+ in boundary layer region and the robustness of FVS in shock region. Several numerical tests show that AUSM(+)-FVS can reduce the shock instability and has a good accuracy in boundary layer region.

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GB/T 7714 Guo, Shaolong , Tao, Wen-Quan . A hybrid flux splitting method for compressible flow [J]. | NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS , 2018 , 73 (1) : 33-47 .
MLA Guo, Shaolong et al. "A hybrid flux splitting method for compressible flow" . | NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS 73 . 1 (2018) : 33-47 .
APA Guo, Shaolong , Tao, Wen-Quan . A hybrid flux splitting method for compressible flow . | NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS , 2018 , 73 (1) , 33-47 .
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Study of thermal contact resistance of rough surfaces based on the practical topography EI SCIE Scopus
期刊论文 | 2018 , 164 , 2-11 | COMPUTERS & FLUIDS
WoS CC Cited Count: 1
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An approach is proposed to predict the thermal contact resistance (TCR) of rough surfaces. The practical rough topography of surfaces is measured by a contour profiler and is reconstructed to numerically analyze the mechanical and thermal contact performance. The studied material pairs are Ti-6Al-4V-Ti6Al-4V and C/C-SiC high temperature ceramic (HTC). The TCR with air gap and vacuum gap conditions are calculated. The approach is validated by the comparison with experimental results of surfaces with the same topography at the same temperatures and loading pressures. The influence of thermal contact conductance between real contact asperities on the TCR of rough surfaces is studied. The approach can be used to predict TCR of different materials with different gap medium under different temperatures and loading pressures. The results show that the real contact area increases approximate linearly, while TCR decreases with the increasing pressure. (C) 2016 Elsevier Ltd. All rights reserved.

Keyword :

Practical topography Numerical simulation Thermal contact resistance Rough surfaces

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GB/T 7714 Gou, Jian-Jun , Ren, Xing-Jie , Dai, Yan-Jun et al. Study of thermal contact resistance of rough surfaces based on the practical topography [J]. | COMPUTERS & FLUIDS , 2018 , 164 : 2-11 .
MLA Gou, Jian-Jun et al. "Study of thermal contact resistance of rough surfaces based on the practical topography" . | COMPUTERS & FLUIDS 164 (2018) : 2-11 .
APA Gou, Jian-Jun , Ren, Xing-Jie , Dai, Yan-Jun , Li, Shuguang , Tao, Wen-Quan . Study of thermal contact resistance of rough surfaces based on the practical topography . | COMPUTERS & FLUIDS , 2018 , 164 , 2-11 .
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