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Real-time particle filtration of granular filters for hot gas clean-up EI Scopus
期刊论文 | 2019 , 237 , 308-319 | Fuel
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Abstract :

A real-time filtration model is developed in this paper, and numerical simulations are presented for filtration performance of a randomly packed granular filter. Fluid flow characteristics and filtration performance at the initial state are first investigated. Correlations of initial filtration efficiency and initial pressure drop are obtained with good prediction accuracy. Particle filtration characteristics on the granule surface show that the real-time filtration model can well predict particle deposition and accumulation characteristics on the granule surface. The particle deposition fraction in the filter decreases with filter depth, and for longer filtration time, inhomogeneity appears in the axial deposition fraction. Correlations of filtration efficiency and pressure drop versus time are presented and both are of sufficient accuracy for engineering purposes. The expression of the cleaning time is obtained, which can be used to determine the optimized cleaning time for economic operation of granular filters. © 2018 Elsevier Ltd

Keyword :

Accumulation characteristics Deposition fractions Filtration efficiency Filtration performance Granular filter Hot gas-clean up Particle depositions Real time scale

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GB/T 7714 Wang, Fei-Long , He, Ya-Ling , Tang, Song-Zhen et al. Real-time particle filtration of granular filters for hot gas clean-up [J]. | Fuel , 2019 , 237 : 308-319 .
MLA Wang, Fei-Long et al. "Real-time particle filtration of granular filters for hot gas clean-up" . | Fuel 237 (2019) : 308-319 .
APA Wang, Fei-Long , He, Ya-Ling , Tang, Song-Zhen , Kulacki, Francis A. , Tao, Yu-Bing . Real-time particle filtration of granular filters for hot gas clean-up . | Fuel , 2019 , 237 , 308-319 .
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Lattice Boltzmann methods for single-phase and solid-liquid phase-change heat transfer in porous media: A review EI Scopus
期刊论文 | 2019 , 129 , 160-197 | International Journal of Heat and Mass Transfer
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Abstract :

Over the past 30 years, the lattice Boltzmann (LB) method has been developed into a versatile and powerful numerical methodology for computational fluid dynamics and heat transfer. Owing to its kinetic nature, the LB method has the capability to incorporate the essential mesoscopic physics, and it is particularly successful in modeling transport phenomena involving complex boundaries and interfacial dynamics. Up to now, the LB method has achieved great success in modeling fluid flow and heat transfer in porous media. Since the LB method is inherently transient, it is especially useful for investigating transient solid-liquid phase-change processes wherein the interfacial behaviors are very important. In this article, a comprehensive review of the LB methods for single-phase and solid-liquid phase-change heat transfer in porous media at both the pore scale and representative elementary volume (REV) scale. The review first introduces the fundamental theory of the LB method for fluid flow and heat transfer. Subsequently, the REV-scale LB method for fluid flow and single-phase heat transfer in porous media and the LB method for solid-liquid phase-change heat transfer are discussed in detail. Moreover, the applications of the LB methods in single-phase and solid-liquid phase-change heat transfer in porous media are reviewed. The LB modeling and predictions of the effective thermal conductivity of porous materials are also reviewed. Finally, further developments of the LB method in the related areas are briefly discussed. © 2018 Elsevier Ltd

Keyword :

Effective thermal conductivity Fluid flow and heat transfers Lattice Boltzmann method Modeling and predictions Numerical methodologies Representative elementary volume Single phase heat transfers Solid liquid phase change

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GB/T 7714 He, Ya-Ling , Liu, Qing , Li, Qing et al. Lattice Boltzmann methods for single-phase and solid-liquid phase-change heat transfer in porous media: A review [J]. | International Journal of Heat and Mass Transfer , 2019 , 129 : 160-197 .
MLA He, Ya-Ling et al. "Lattice Boltzmann methods for single-phase and solid-liquid phase-change heat transfer in porous media: A review" . | International Journal of Heat and Mass Transfer 129 (2019) : 160-197 .
APA He, Ya-Ling , Liu, Qing , Li, Qing , Tao, Wen-Quan . Lattice Boltzmann methods for single-phase and solid-liquid phase-change heat transfer in porous media: A review . | International Journal of Heat and Mass Transfer , 2019 , 129 , 160-197 .
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Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring Scopus
期刊论文 | 2019 , 236 , 949-959 | Fuel
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© 2018 Elsevier Ltd An on line experimental system was set up in a heating boiler so as to reproduce dusty working environments in heat recovery systems and to investigate heat transfer and fouling performance of different kinds of finned tube heat exchangers. Measurements are reported for the heat transfer coefficients, fouling and the effect of fouling on heat transfer performance of five different H-type finned tube heat exchangers. Fouling resistance and the weakened degree of heat transfer coefficient are employed to evaluate the effect of fouling on the heat transfer performance. Numerical simulations are also conducted on the fouling performance of each heat exchanger bundle and compared to the measurements. Double H-type fins can slightly reduce the heat transfer performance but also reduce fouling. Elliptical finned tubes with the same tube pitch decrease heat transfer performance and increase fouling, and with the same relative tube pitch, significantly increase the heat transfer performance before fouling, and can effectively reduce fouling.

Keyword :

Fouling H-type finned tube Heat transfer On line experiment Waste heat recovery

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GB/T 7714 Wang, Fei-Long , Tang, Song-Zhen , He, Ya-Ling et al. Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring [J]. | Fuel , 2019 , 236 : 949-959 .
MLA Wang, Fei-Long et al. "Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring" . | Fuel 236 (2019) : 949-959 .
APA Wang, Fei-Long , Tang, Song-Zhen , He, Ya-Ling , Kulacki, Francis A. , Yu, Yang . Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring . | Fuel , 2019 , 236 , 949-959 .
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The effect of the full-spectrum characteristics of nanostructure on the PV-TE hybrid system performances within multi-physics coupling process EI SCIE Scopus
期刊论文 | 2018 , 213 , 169-178 | APPLIED ENERGY
WoS CC Cited Count: 3
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Abstract :

Nanostructured surface is an important way to improve the efficiency of solar energy by absorbing more solar irradiance. However, due the bandgap of semiconductor material, more absorbed irradiance results in more waste heat. As for photovoltaic-thermoelectric (PV-TE) hybrid system, more waste heat reduces the efficiency of PV module due to the increased temperature, but is beneficial for TE module. There are complex and coupling physical processes (near-field optics, photoVoltaic conversion, thermoelectric effects, and heat transfer) in the PV-TE hybrid system. Therefore, a multi-physics coupling mathematic model is developed for investigating the effect of full-spectrum characteristics of nanostructure on the PV-TE hybrid system performances. At first, the full-spectrum characteristics of nanostructure is found and summed up. As an example, the II set of the cone nanostructures have two cone nanostructure (II-1 cone nanostructure and II-2 cone nanostructure) with different dimensions. They have the same average reflectance of the wavelength range from 0.35 mu m to 1.1 mu m (0.05), however the average reflectance of the wavelength range from 1.1 mu m to 2.5 mu m (Ra,(1.1-2.5)) of the II-1 cone nanostructure is 74.8% lower than that of the II-2 cone nanostructure, which results in that the output power density of the PV-TE hybrid system with the II-2 cone nanostructure being 8.4 W/m(2) more than that with the II-1 cone nanostructure when the concentration ratio is 10. Thus, the cone nanostructures with as high Ra,(1.1-2.)5 as possible are more beneficial for the hybrid system. Then, by optimizing the heat transfer structure of the PV-TE hybrid system, the output power density is increased by 9.1%. At last, through dynamic analysis, it is found that the annual power generation per square meter of the PV-TE hybrid system with II-2 cone nanostructure is about 17 kW.h/m(2) greater than that with the II-1 cone nanostructure. As a result, combined with the structural analysis of the cone nanostructure, the bottom diameter should be as short as possible for the cone nanostructure.

Keyword :

Full-spectrum Nanostructure Power generation PV-TE hybrid system Multi-physics

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GB/T 7714 Zhou, Yi-Peng , Li, Ming-Jia , Yang, Wei-Wei et al. The effect of the full-spectrum characteristics of nanostructure on the PV-TE hybrid system performances within multi-physics coupling process [J]. | APPLIED ENERGY , 2018 , 213 : 169-178 .
MLA Zhou, Yi-Peng et al. "The effect of the full-spectrum characteristics of nanostructure on the PV-TE hybrid system performances within multi-physics coupling process" . | APPLIED ENERGY 213 (2018) : 169-178 .
APA Zhou, Yi-Peng , Li, Ming-Jia , Yang, Wei-Wei , He, Ya-Ling . The effect of the full-spectrum characteristics of nanostructure on the PV-TE hybrid system performances within multi-physics coupling process . | APPLIED ENERGY , 2018 , 213 , 169-178 .
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Parametric study on fouling mechanism and heat transfer characteristics of tube bundle heat exchangers for reducing fouling considering the deposition and removal mechanisms EI SCIE Scopus
期刊论文 | 2018 , 211 , 301-311 | FUEL
WoS CC Cited Count: 5
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Abstract :

Particulate fouling on flue gas heat exchanger surfaces reduces heat transfer efficiency and increases the instability of equipment operation. It is necessary to develop a better understanding of how fouling occurs, aiming to find strategies to predict and reduce it. In this paper, a multiple mean cycle method is proposed based on a comprehensive fouling model considering the deposition and removal mechanisms, combined with the discrete phase model and dynamic mesh method, to predict the fouling morphology. Then the effects of transverse pitch, longitudinal pitch, tube shape and arrangement on fly-ash fouling and heat transfer characteristics are examined. It is found that, for aligned arrangement, the fly-ash particles are mainly deposited at the upwind stagnation region at the first row and whole windward side of the rest rows; for staggered arrangement, the fly-ash particles are deposited at the upwind stagnation region. The multiple mean cycle method can predict the fouling morphology efficiently and keep the characteristic of non-uniform fouling distribution. The fouling mass increases with the increase of relative transverse and longitudinal pitches. The elliptical tube bundle with small relative transverse and longitudinal pitches can obviously reduce the fouling mass especially for the staggered elliptical tube. Compared with the aligned circular tube arrangement, the fouling mass m(f) is decreased by 81.1% at 10 min. In addition, the weaken degree of Nusselt number after fouling Delta Nu for the staggered elliptical tube is only about 49.8% of the aligned circular tube arrangement. Consequently, using the staggered elliptical tube contributes to reduce the fly-ash fouling, decrease the soot-blowing frequency and ensure the efficiency, economy and safety of flue gas heat exchangers.

Keyword :

Parametric study Staggered elliptical tube Fouling model Dynamic mesh Waste heat recovery

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GB/T 7714 Tang, Song-Zhen , He, Ya-Ling , Wang, Fei-Long et al. Parametric study on fouling mechanism and heat transfer characteristics of tube bundle heat exchangers for reducing fouling considering the deposition and removal mechanisms [J]. | FUEL , 2018 , 211 : 301-311 .
MLA Tang, Song-Zhen et al. "Parametric study on fouling mechanism and heat transfer characteristics of tube bundle heat exchangers for reducing fouling considering the deposition and removal mechanisms" . | FUEL 211 (2018) : 301-311 .
APA Tang, Song-Zhen , He, Ya-Ling , Wang, Fei-Long , Tao, Yu-Bing . Parametric study on fouling mechanism and heat transfer characteristics of tube bundle heat exchangers for reducing fouling considering the deposition and removal mechanisms . | FUEL , 2018 , 211 , 301-311 .
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EXPERIMENTAL STUDY OF ORGANIC RANKINE CYCLE SYSTEM USING SCROLL EXPANDER AND DIAPHRAGM PUMP AT DIFFERENT CONDENSING TEMPERATURES EI SCIE Scopus
期刊论文 | 2018 , 49 (10) , 899-914 | HEAT TRANSFER RESEARCH
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Abstract :

A small-scale RORC (organic Rankine cycle with a regenerator) system using a scroll expander and a diaphragm pump has been built. By using R123 as the working fluid, the expander, pump, and system performances are measured under different condensing temperatures. The maximum shaft power output of the expander obtained in this work is about 700 W. By increasing the shaft torque of the expander, the isentropic efficiency of the expander first increases and then decreases. The pressure ratio increases with increase of the shaft torque of the expander. The expander shows a highest shaft power output with the filling factor reaching 0.6-0.7. When T-c increases, both the pump work consumption and the pressure difference of the pump show an increasing trend, leading to an increase in the mass flow rate of the working fluid, which is the main reason for the increase of the shaft power output of the expander. The obtained minimum BWR is about 0.46, the maximum electricity efficiency of the pump is 34.2%. The maximum thermal and exergy efficiencies are 2.4% and 9.3%, respectively.

Keyword :

organic Rankine cycle scroll expander diaphragm pump waste heat recovery experimental study

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GB/T 7714 Xi, Huan , Zhang, Hong-Hu , He, Ya-Ling . EXPERIMENTAL STUDY OF ORGANIC RANKINE CYCLE SYSTEM USING SCROLL EXPANDER AND DIAPHRAGM PUMP AT DIFFERENT CONDENSING TEMPERATURES [J]. | HEAT TRANSFER RESEARCH , 2018 , 49 (10) : 899-914 .
MLA Xi, Huan et al. "EXPERIMENTAL STUDY OF ORGANIC RANKINE CYCLE SYSTEM USING SCROLL EXPANDER AND DIAPHRAGM PUMP AT DIFFERENT CONDENSING TEMPERATURES" . | HEAT TRANSFER RESEARCH 49 . 10 (2018) : 899-914 .
APA Xi, Huan , Zhang, Hong-Hu , He, Ya-Ling . EXPERIMENTAL STUDY OF ORGANIC RANKINE CYCLE SYSTEM USING SCROLL EXPANDER AND DIAPHRAGM PUMP AT DIFFERENT CONDENSING TEMPERATURES . | HEAT TRANSFER RESEARCH , 2018 , 49 (10) , 899-914 .
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Multi-physics analysis: The coupling effects of nanostructures on the low concentrated black silicon photovoltaic system performances EI SCIE Scopus
期刊论文 | 2018 , 159 , 129-139 | ENERGY CONVERSION AND MANAGEMENT
WoS CC Cited Count: 1
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Abstract :

Black silicon (nanostructured front surface) can significantly improve the efficiency of the silicon solar cell by absorbing more solar irradiance. However, due to the band gap of the semiconductor material, most part of the absorbed solar irradiance is converted into heat to increase the temperature of solar cell. Especially under the concentrating condition, the waste heat is more. Besides, multi-physics coupling problem makes it difficult to study the effects of nanostructures on the performances of the low concentrated black silicon photovoltaic system. In this study, a multi-physics model of a low concentration photovoltaics (LCPV) that employs an all back-contact black silicon solar cell is built. As for the multi-physics problem in LCPV, a multi-physics coupling mathematical model is developed. Its advantage is to couple near-flied optics, photoelectric conversion, and heat transfer. Furthermore, through parameter sensitivity analysis, it is proved that the coupling mathematical model is more accurate, because it takes full account of the nonlinear correlation between the output power and the temperature, and the effects of series resistance under concentrating condition. Hence, the mathematical model is used to investigate the coupling effects of nanostructures, and it is found that the nanostructure with lower reflectance may not be beneficial for the low concentrated black silicon photovoltaic due to the increased temperature. According to different circumstances, the maximum output power with the lower cost could be achieved by choosing the nanostructure with appropriate reflectance. At last, the dynamic analysis proves that the coupling effects of nanostructure lead to the result that the nanostructure with lower reflectance reduces the annual power generation per square meter of the low concentrated black silicon photovoltaic system by about 116 kW h/m(2) when the concentration ratio is 10.

Keyword :

Nanostructure Low concentrated photovoltaics All-back-contact black silicon solar cell Multi-physics Dynamic analysis

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GB/T 7714 Zhou, Yi-Peng , Li, Ming-Jia , He, Ya-Ling et al. Multi-physics analysis: The coupling effects of nanostructures on the low concentrated black silicon photovoltaic system performances [J]. | ENERGY CONVERSION AND MANAGEMENT , 2018 , 159 : 129-139 .
MLA Zhou, Yi-Peng et al. "Multi-physics analysis: The coupling effects of nanostructures on the low concentrated black silicon photovoltaic system performances" . | ENERGY CONVERSION AND MANAGEMENT 159 (2018) : 129-139 .
APA Zhou, Yi-Peng , Li, Ming-Jia , He, Ya-Ling , Li, Yin-Shi . Multi-physics analysis: The coupling effects of nanostructures on the low concentrated black silicon photovoltaic system performances . | ENERGY CONVERSION AND MANAGEMENT , 2018 , 159 , 129-139 .
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Effects of nozzle arrangement on uniformity of multiple impinging jets heat transfer in a fast cooling simulation device EI SCIE Scopus
期刊论文 | 2018 , 164 , 83-93 | COMPUTERS & FLUIDS
WoS CC Cited Count: 1
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Abstract :

A cooling simulation device utilizing multiple impinging jets is built for ground cooling simulation tests of high speed flight vehicles. To help the design of the device and supply a relatively uniform heat flux on the test piece surface, a three-dimensional numerical study is performed in this paper to investigate the effects of nozzle arrangement on the convective heat transfer uniformity of the impinging jets. A simplified physical model with the size of 200 mm x 200 mm x 50 mm is built and the shear-stress transport (SST) k-omega turbulence model is used in the calculation. The nozzle quantity is varied from 8 x 8 to 32 x 32 for uniform nozzle arrays with a fixed total area of the nozzles. The corresponding numerical results of uniform nozzle arrangements are analyzed in details. Based on the 16 x 16 uniform arrangement results, the effects of diameter varying nozzle arrangements on heat transfer uniformity are further examined. Finally, an overall performance evaluation indicator named QU ratio is used in the optimization of nozzle arrangement, which proves to be effective and convenient in practice. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Multiple impinging jets Nozzle arrangement Numerical simulation Ground cooling simulation Heat transfer uniformity

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GB/T 7714 Wen, Zhe-Xi , He, Ya-Ling , Ma, Zhao . Effects of nozzle arrangement on uniformity of multiple impinging jets heat transfer in a fast cooling simulation device [J]. | COMPUTERS & FLUIDS , 2018 , 164 : 83-93 .
MLA Wen, Zhe-Xi et al. "Effects of nozzle arrangement on uniformity of multiple impinging jets heat transfer in a fast cooling simulation device" . | COMPUTERS & FLUIDS 164 (2018) : 83-93 .
APA Wen, Zhe-Xi , He, Ya-Ling , Ma, Zhao . Effects of nozzle arrangement on uniformity of multiple impinging jets heat transfer in a fast cooling simulation device . | COMPUTERS & FLUIDS , 2018 , 164 , 83-93 .
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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
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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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Optimization method for the porous volumetric solar receiver coupling genetic algorithm and heat transfer analysis EI SCIE Scopus
期刊论文 | 2018 , 122 , 383-390 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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The porous volumetric solar receiver shows advantages such as the volumetric absorption of solar radiation and the enhanced convective heat transfer. However, few studies were focused on the selection of the appropriate parameters of the receiver to improve its performance. In this contribution, an optimization method which couples the genetic algorithm and the heat transfer analysis of the porous volumetric solar receiver is proposed. The fluid flow and heat transfer in the receiver are evaluated by the volume averaging simulation method based on the local thermal non-equilibrium model. By combining with the genetic algorithm, the solar receiver with high thermal efficiency and low flow resistance could be identified. The single-objective optimization results present that larger porosity and higher inlet velocity are preferable to improve the thermal efficiency of the porous volumetric solar receiver. The optimized pore size increases with the increase of the thickness of the receiver and the decrease of the inlet velocity. Meanwhile, the porosity and the pore size are optimized simultaneously through the multi-objective optimization. The Pareto front which indicates the receiver with relatively lower flow resistance and relatively higher thermal efficiency is derived. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Porous volumetric solar receiver Multi-objective optimization Local thermal non-equilibrium Optimization design Genetic algorithm

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GB/T 7714 Du, Shen , He, Ya-Ling , Yang, Wei-Wei et al. Optimization method for the porous volumetric solar receiver coupling genetic algorithm and heat transfer analysis [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 122 : 383-390 .
MLA Du, Shen et al. "Optimization method for the porous volumetric solar receiver coupling genetic algorithm and heat transfer analysis" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 122 (2018) : 383-390 .
APA Du, Shen , He, Ya-Ling , Yang, Wei-Wei , Liu, Zhan-Bin . Optimization method for the porous volumetric solar receiver coupling genetic algorithm and heat transfer analysis . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 122 , 383-390 .
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