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Experimental and numerical investigation on inspiration and expiration flows in a three-generation human lung airway model at two flow rates. PubMed
期刊论文 | 2019 , 262 , 40-48 | Respiratory physiology & neurobiology
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Abstract :

The respiration flow pattern plays a key role in fluid flow, heat and mass transfer in human lung airway. To reveal the complex flow pattern within human lung multiple-generation airway, both the steady inspiration and expiration flows are comprehensively studied using laser Doppler velocimetry technique and computational fluid dynamics method for an idealized human tracheobronchial three-generation airway model at two flow rates, corresponding to an adult male breathing under light activity and moderate exercise conditions, respectively. The comparison of mainstream velocity between the measurements and simulations are generally good. Both of the inspiration and expiration flows are heavily influenced by the combination of geometrical bifurcating/merging, local wall curvature, limited generation length and multi-generation interaction. The mainstream flow is non-uniform and behaves as skewed, double-peaked and M-shaped patterns. The secondary flow is complex and characteristic of Dean-type two-vortex, four-vortex, six-vortex and eight-vortex patterns. This work is of scientific significance for a deep understanding of respiratory flow physics and of certain application values for clinical diagnosis and remedy of respiratory deceases.

Keyword :

Three-generation airway model Inspiration flow Expiration flow CFD simulations LDV measurements Tracheobronchial model

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GB/T 7714 Zhu Zhenshan , Zhang Chuhua , Zhang Li . Experimental and numerical investigation on inspiration and expiration flows in a three-generation human lung airway model at two flow rates. [J]. | Respiratory physiology & neurobiology , 2019 , 262 : 40-48 .
MLA Zhu Zhenshan 等. "Experimental and numerical investigation on inspiration and expiration flows in a three-generation human lung airway model at two flow rates." . | Respiratory physiology & neurobiology 262 (2019) : 40-48 .
APA Zhu Zhenshan , Zhang Chuhua , Zhang Li . Experimental and numerical investigation on inspiration and expiration flows in a three-generation human lung airway model at two flow rates. . | Respiratory physiology & neurobiology , 2019 , 262 , 40-48 .
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A comparative study of PCM melting process in a heat pipe-assisted LHTES unit enhanced with nanoparticles and metal foams by immersed boundary-lattice Boltzmann method at pore-scale EI SCIE Scopus
期刊论文 | 2018 , 121 , 1214-1228 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
WoS CC Cited Count: 3
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Abstract :

Latent heat thermal energy storage (LHTES) has attracted lots of attention due to its nearly constant working temperature and large thermal energy storage density. However, the thermal conductivity of phase change materials (PCMs) is usually low which impedes the heat transfer efficiency in the LHTES system. Adding high thermal conductivity nanoparticles or metal foams are the two common approaches to enhance the thermal performance of the PCMs. In the current work, the PCM melting performance in a heat pipe-assisted LHTES unit enhanced by nanoparticle-metal foam combination is numerically investigated by immersed boundary-lattice Boltzmann method (IB-LBM) at pore scale. The microstructure of metal foam is reconstructed using the quartet structure generation set (QSGS). The PCM melting performance in LHTES is studied in terms of porosity and pore size of metal foams, volume fraction of nanoparticles, and radius of heat pipe. A comparative study is carried out to illustrate the effectiveness of enhancing PCM melting performance with different combinations of nanoparticles and metal foams. The results indicate that there exist the optimum metal foam porosity and heat pipe radius for the energy storage efficiency in the LHTES unit. Besides, it is found that using metal foams is more effective than adding nanoparticles for the improvement of PCM heat transfer capability. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Metal foam Phase change materials Immersed boundary-lattice Boltzmann method Nanofluid GPU computing

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GB/T 7714 Ren, Qinlong , Meng, Fanlong , Guo, Penghua . A comparative study of PCM melting process in a heat pipe-assisted LHTES unit enhanced with nanoparticles and metal foams by immersed boundary-lattice Boltzmann method at pore-scale [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 121 : 1214-1228 .
MLA Ren, Qinlong 等. "A comparative study of PCM melting process in a heat pipe-assisted LHTES unit enhanced with nanoparticles and metal foams by immersed boundary-lattice Boltzmann method at pore-scale" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 121 (2018) : 1214-1228 .
APA Ren, Qinlong , Meng, Fanlong , Guo, Penghua . A comparative study of PCM melting process in a heat pipe-assisted LHTES unit enhanced with nanoparticles and metal foams by immersed boundary-lattice Boltzmann method at pore-scale . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 121 , 1214-1228 .
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Three-dimensional particle tracking velocimetry algorithm based on tetrahedron vote EI SCIE Scopus
期刊论文 | 2018 , 59 (2) | EXPERIMENTS IN FLUIDS
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A particle tracking velocimetry algorithm based on tetrahedron vote, which is named TV-PTV, is proposed to overcome the limited selection problem of effective algorithms for 3D flow visualisation. In this new cluster-matching algorithm, tetrahedrons produced by the Delaunay tessellation are used as the basic units for inter-frame matching, which results in a simple algorithmic structure of only two independent preset parameters. Test results obtained using the synthetic test image data from the Visualisation Society of Japan show that TV-PTV presents accuracy comparable to that of the classical algorithm based on new relaxation method (NRX). Compared with NRX, TV-PTV possesses a smaller number of loops in programming and thus a shorter computing time, especially for large particle displacements and high particle concentration. TV-PTV is confirmed practically effective using an actual 3D wake flow.

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GB/T 7714 Cui, Yutong , Zhang, Yang , Jia, Pan et al. Three-dimensional particle tracking velocimetry algorithm based on tetrahedron vote [J]. | EXPERIMENTS IN FLUIDS , 2018 , 59 (2) .
MLA Cui, Yutong et al. "Three-dimensional particle tracking velocimetry algorithm based on tetrahedron vote" . | EXPERIMENTS IN FLUIDS 59 . 2 (2018) .
APA Cui, Yutong , Zhang, Yang , Jia, Pan , Wang, Yuan , Huang, Jingcong , Cui, Junlei et al. Three-dimensional particle tracking velocimetry algorithm based on tetrahedron vote . | EXPERIMENTS IN FLUIDS , 2018 , 59 (2) .
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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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A turbulent two-phase model for predicting cavitating flow based on homogenous nucleation theory EI SCIE Scopus
期刊论文 | 2018 , 97 , 17-29 | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
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Cavitation is important for good design and performance on engineering machinery, especially for devices such as injector nozzles. In this study, an enhanced cavitation model is proposed with the consideration of vapor transport, bubble dynamics, nucleation, turbulence and the dissolved gas. Based on the classical nucleation theory (CNT), the analysis of nucleation formation process has been carried out in this model. The bubble size distribution obtained from experimental data is also taken into account in this model. Besides, the turbulence effect on the pressure fluctuations is discussed based on the Boussinesq approximation. According to Henry's law, the dissolved gas effect is incorporated into this model by dividing dissolved gas into several different amount and types of gases. All the coefficients used in this model can be either set at recommended values or obtained from previous experiments. The validation of this model is conducted on the experiments of sharp-edged orifice and the NASA CR-2156 hydrofoil. The results show that the proposed model is in good agreement with experiments. This model is also extended into a vortex form in order to simulate the string cavitation phenomenon observed in the visualized multi-orifice diesel nozzle experiment. The proposed model has captured the string cavitation phenomenon and made a preliminary investigation on vortex cavitation inside diesel nozzle.

Keyword :

Nucleation theory Dissolved gas Cavitation model Turbulence pressure

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GB/T 7714 Li, Donghua , Liu, Shenghua , Wei, Yanju et al. A turbulent two-phase model for predicting cavitating flow based on homogenous nucleation theory [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2018 , 97 : 17-29 .
MLA Li, Donghua et al. "A turbulent two-phase model for predicting cavitating flow based on homogenous nucleation theory" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 97 (2018) : 17-29 .
APA Li, Donghua , Liu, Shenghua , Wei, Yanju , Ren, Tongtong , Tang, Yonghong . A turbulent two-phase model for predicting cavitating flow based on homogenous nucleation theory . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2018 , 97 , 17-29 .
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Numerical investigation on transient internal cavitating flow and spray characteristics in a single-hole diesel injector nozzle: A 3D method for cavitation-induced primary break-up EI SCIE Scopus
期刊论文 | 2018 , 233 , 778-795 | FUEL
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

The spray development and atomization are strongly influenced by the internal nozzle flow. In this study, a 3D cavitation-induced primary break-up method is proposed based on cavitation characteristics studies. The reason why to develop this advanced standard method and abandon the total Eulerian approach has been discussed. The transient cavitation characteristics inside a single-hole diesel injector nozzle were numerically investigated. Combined with previous experimental studies, a dynamic mesh method and its related numerical model were utilized to investigate the inner cavitating flow characteristics for cases of different maximum needle lift values, injection pressures and ambient pressures. It is found that the mass flow rate increases significantly with the increase of maximum lift position for low needle lift cases. The cavitating flow for low needle lift cases requires necessary simulations and the traditional standard method with only empirical equations is not enough. It is also found that for high needle lift cases, the internal flow keeps stable for over 90 percent of the total injection process. The 3D method aims to incorporate as much flow information as possible to avoid using the total Eulerian approach. The 3D method allows for nozzle cross section with both two-dimensional and three-dimensional data. The spray experiment in a constant chamber with different injection pressure and the same ambient pressure is employed to validate the 3D method. The 3D method with transient internal flow profiles is implemented into the AVL Fire CFD codes. The 3D method, together with the typical standard method (with or without 1D method) are applied to the experimental data, including spray tip penetration (STP), spray shape and droplet diameter. The results show that the 3D method has good predictive ability on the spray development and shape, and it has better performance on droplet diameter prediction.

Keyword :

Cavitation characteristics Critical stability position Primary break-up Standard method

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GB/T 7714 Li, Donghua , Liu, Shenghua , Wei, Yanju et al. Numerical investigation on transient internal cavitating flow and spray characteristics in a single-hole diesel injector nozzle: A 3D method for cavitation-induced primary break-up [J]. | FUEL , 2018 , 233 : 778-795 .
MLA Li, Donghua et al. "Numerical investigation on transient internal cavitating flow and spray characteristics in a single-hole diesel injector nozzle: A 3D method for cavitation-induced primary break-up" . | FUEL 233 (2018) : 778-795 .
APA Li, Donghua , Liu, Shenghua , Wei, Yanju , Liang, Renzhi , Tang, Yonghong . Numerical investigation on transient internal cavitating flow and spray characteristics in a single-hole diesel injector nozzle: A 3D method for cavitation-induced primary break-up . | FUEL , 2018 , 233 , 778-795 .
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Numerical Investigations of the Effects of the Rotating Shaft and Optimization of Urban Vertical Axis Wind Turbines EI SCIE Scopus
期刊论文 | 2018 , 11 (7) | ENERGIES
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The central shaft is an important and indispensable part of a small scale urban vertical axis wind turbines (VAWTs). Normally, it is often operated at the same angular velocity as the wind turbine. The shedding vortices released by the rotating shaft have a negative effect on the blades passing the wake of the wind shaft. The objective of this study is to explore the influence of the wake of rotating shaft on the performance of the VAWT under different operational and physical parameters. The results show that when the ratio of the shaft diameter to the wind turbine diameter (alpha) is 9%, the power loss of the wind turbine in one revolution increases from 0% to 25% relative to that of no-shaft wind turbine (this is a numerical experiment for which the shaft of the VAWT is removed in order to study the interactions between the shaft and blade). When the downstream blades pass through the wake of the shaft, the pressure gradient of the suction side and pressure side is changed, and an adverse effect is also exerted on the lift generation in the blades. In addition, alpha = 5% is a critical value for the rotating shaft wind turbine (the lift-drag ratio trend of the shaft changes differently). In order to figure out the impacts of four factors; namely, tip speed ratios (TSRs), alpha, turbulence intensity (TI), and the relative surface roughness value (k(s)/d(s)) on the performance of a VAWT system, the Taguchi method is employed in this study. The influence strength order of these factors is featured by TSRs > k(s)/d(s) > alpha > TI. Furthermore, within the range we have analyzed in this study, the optimal power coefficient (C-p) occurred under the condition of TSR = 4, alpha = 5%, k(s)/d(s) = 1 x 10(-2), and TI = 8%.

Keyword :

shedding vortices influence strength order vertical axis wind turbine (VAWT) rotating shaft Taguchi method

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GB/T 7714 Zhang, Lidong , Zhu, Kaiqi , Zhong, Junwei et al. Numerical Investigations of the Effects of the Rotating Shaft and Optimization of Urban Vertical Axis Wind Turbines [J]. | ENERGIES , 2018 , 11 (7) .
MLA Zhang, Lidong et al. "Numerical Investigations of the Effects of the Rotating Shaft and Optimization of Urban Vertical Axis Wind Turbines" . | ENERGIES 11 . 7 (2018) .
APA Zhang, Lidong , Zhu, Kaiqi , Zhong, Junwei , Zhang, Ling , Jiang, Tieliu , Li, Shaohua et al. Numerical Investigations of the Effects of the Rotating Shaft and Optimization of Urban Vertical Axis Wind Turbines . | ENERGIES , 2018 , 11 (7) .
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An efficient modified WENO scheme based on the identification of inflection points EI SCIE Scopus
期刊论文 | 2018 , 170 , 176-186 | COMPUTERS & FLUIDS
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In this paper, a new modified fifth-order weighted essentially non-oscillatory (WENO) scheme is proposed by introducing a switching principle based on the identification of inflection points. The switching principle adjusts the scheme between the linear upwind scheme and the WENO-M scheme automatically. If there is one or more inflection points located in the large reconstruction stencil, the WENO-M procedure is applied to reconstruct the numerical flux, instead of the classical WENO scheme; otherwise, the linear upwind scheme is used. The new scheme is more efficient due to the identification of the inflection points, and has higher numerical accuracy and resolution due to the usage of WENO-M procedure. A set of benchmark problems are conducted and analyzed to verify the performance enhancement. The extreme shock tube problem of Leblanc is computed to demonstrate the robustness of the new scheme. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Computational efficiency High resolution WENO scheme Inflection point

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GB/T 7714 Chai, Delin , Xi, Guang , Sun, Zhongguo et al. An efficient modified WENO scheme based on the identification of inflection points [J]. | COMPUTERS & FLUIDS , 2018 , 170 : 176-186 .
MLA Chai, Delin et al. "An efficient modified WENO scheme based on the identification of inflection points" . | COMPUTERS & FLUIDS 170 (2018) : 176-186 .
APA Chai, Delin , Xi, Guang , Sun, Zhongguo , Wang, Zhiheng , Huang, Zhu . An efficient modified WENO scheme based on the identification of inflection points . | COMPUTERS & FLUIDS , 2018 , 170 , 176-186 .
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Stabilized spectral element method for solving a two-dimensional steady convection-diffusion equation EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (3) , 446-451 | Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University
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A numerical solution method with high accuracy is proposed herein for the instability problems of a two-dimensional steady convection-dominated convection-diffusion equation. The new scheme is a stabilized spectral element method based on the consistent approximate upwind method and the Chebyshev spectral element method. The feasibility of the method is verified by numerical examples. Moreover, the relation among the calculation accuracy, convergence rate, boundary layer approximation, and the order of the element interpolation is discussed. The results show that compared with the spectral element method, the stabilized spectral element method greatly enlarges the stable solution region for the convection-diffusion equation. The numerical oscillations in the computational domain and near the boundary layers in the convection-diffusion problem are completely eliminated. In addition, the internal and external boundary layers are excellently approximated. The computational accuracy and the effect of approximation to the boundary layers are both rapidly enhanced with the increase of the element interpolation order. © 2018, Editorial Department of Journal of HEU. All right reserved.

Keyword :

Convection-diffusion equations Element interpolation order High-accuracy Numerical oscillation Spectral element method

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GB/T 7714 He, Wenqiang , Qin, Guoliang , Bao, Zhenzhong et al. Stabilized spectral element method for solving a two-dimensional steady convection-diffusion equation [J]. | Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University , 2018 , 39 (3) : 446-451 .
MLA He, Wenqiang et al. "Stabilized spectral element method for solving a two-dimensional steady convection-diffusion equation" . | Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University 39 . 3 (2018) : 446-451 .
APA He, Wenqiang , Qin, Guoliang , Bao, Zhenzhong , Wang, Yazhou . Stabilized spectral element method for solving a two-dimensional steady convection-diffusion equation . | Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University , 2018 , 39 (3) , 446-451 .
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Advances in Fluid Dynamics of Turbomachinery EI Scopus
期刊论文 | 2018 , 2018 | International Journal of Rotating Machinery
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GB/T 7714 Li, Jingyin , Epple, Philipp , Kim, Heuy-Dong et al. Advances in Fluid Dynamics of Turbomachinery [J]. | International Journal of Rotating Machinery , 2018 , 2018 .
MLA Li, Jingyin et al. "Advances in Fluid Dynamics of Turbomachinery" . | International Journal of Rotating Machinery 2018 (2018) .
APA Li, Jingyin , Epple, Philipp , Kim, Heuy-Dong , Tan, Lei . Advances in Fluid Dynamics of Turbomachinery . | International Journal of Rotating Machinery , 2018 , 2018 .
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