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Experimental study of subcooled boiling pool heat transfer and its "hook back" phenomenon on micro/nanostructured surfaces SCIE
期刊论文 | 2019 , 100 , 73-82 | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
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Abstract :

This study presents the pool boiling heat transfer of gas dissolved FC-72 on micro/nanostructured surfaces. The micro/nanostructured surfaces, named LS30, LS70, LS100, LS200, LS400 and LS800 were fabricated by femtosecond laser processing (the number after LS specifies the spacing in mu m). The experiments were conducted at different subcooled degrees (Delta T-sub) of 1 K, 15 K, 25 K and 35 K. For comparison, the pool boiling heat transfer performance of a smooth surface was also tested. It was found that the critical heat flux (CHF) enhancement of micro/nanostructured surfaces increases with increase in subcooling. The maximum CHF of micro/nanostructured surfaces are 1.67, 1.82, 1.95 and 2.06 times larger than that of SS at Delta T-sub = 1, 15, 25 and 35 K, respectively. The processing spacing has pronounced effects on the sensitivity of CHF to subcooling. The CHF of LS30 is enhanced 163% at Delta T-sub = 35 K, while the only a 90% enhancement was obtained for LS800. The "hook back" phenomenon characterized as wall superheat decrease with increasing heat flux on boiling curves at high heat fluxes can be observed on LS30, LS70, LS100, LS200 and LS400. This phenomenon is more clear at the lower subcooling and the lager nanoporous structure covered area.

Keyword :

Subcooling Micro/nanostructure Boiling heat transfer Critical heat flux Hook back phenomenon

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GB/T 7714 Liu, Bin , Liu, Jie , Zhou, Jie et al. Experimental study of subcooled boiling pool heat transfer and its "hook back" phenomenon on micro/nanostructured surfaces [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2019 , 100 : 73-82 .
MLA Liu, Bin et al. "Experimental study of subcooled boiling pool heat transfer and its "hook back" phenomenon on micro/nanostructured surfaces" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 100 (2019) : 73-82 .
APA Liu, Bin , Liu, Jie , Zhou, Jie , Yuan, Bo , Zhang, Yonghai , Wei, Jinjia et al. Experimental study of subcooled boiling pool heat transfer and its "hook back" phenomenon on micro/nanostructured surfaces . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2019 , 100 , 73-82 .
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Design and performance study on a large-scale hybrid CPV/T system based on unsteady-state thermal model EI SCIE
期刊论文 | 2019 , 177 , 427-439 | Solar Energy
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Abstract :

A hybrid CPV/T unit designed in this work concentrates solar radiation by a compound parabolic concentrator (CPC) and converts solar energy into electrical and thermal energy by a PV/T module. The CPC eliminating multiple reflections of solar radiation is defined as the ‘EMR-CPC’ in our previous work, which improves photoelectric and thermal conversion efficiencies. Two similar CPV/T units were tested with two-axis tracking device and south-north single-axis tracking device respectively, and the average photoelectric conversion efficiencies were 13% and 12%. A large-scale south-north tracking hybrid CPV/T system with sunlight collecting area of 810 m2 was built to explore practical application of this CPV/T unit. The whole-day thermal efficiency and total thermal output of the large-scale hybrid CPV/T system were 55% and 1,730,039 kJ respectively on April 14, 2017. The steady-state and unsteady-state thermal models of the hybrid CPV/T system were established and the energy loss was analyzed. The calculated whole-day comprehensive thermal efficiencies of the unsteady-state thermal model and the steady-state thermal model were 55.3% and 55.0% respectively, which were close to the measurement 55.8%. However, the steady-state thermal model failed to accurately predict the whole-day thermal efficiency variation of the system. In comparison, the unsteady-state thermal model accurately predicts instantaneous thermal efficiency of the system varying with meteorological conditions and its total daily heat output. © 2018

Keyword :

Compound parabolic concentrator Large-scale CPV/T system Meteorological condition Multiple reflections Performance study Photoelectric conversion efficiency Thermal efficiency Thermal model

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GB/T 7714 Wang, Zexin , Wei, Jinjia , Zhang, Gaoming et al. Design and performance study on a large-scale hybrid CPV/T system based on unsteady-state thermal model [J]. | Solar Energy , 2019 , 177 : 427-439 .
MLA Wang, Zexin et al. "Design and performance study on a large-scale hybrid CPV/T system based on unsteady-state thermal model" . | Solar Energy 177 (2019) : 427-439 .
APA Wang, Zexin , Wei, Jinjia , Zhang, Gaoming , Xie, Huling , Khalid, Muhammad . Design and performance study on a large-scale hybrid CPV/T system based on unsteady-state thermal model . | Solar Energy , 2019 , 177 , 427-439 .
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Correlations for prediction of the bubble departure radius on smooth flat surface during nucleate pool boiling EI SCIE
期刊论文 | 2019 , 132 , 699-714 | International Journal of Heat and Mass Transfer
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Abstract :

Based on a modified force balance model, new correlations were proposed for the prediction of vapor bubble departure radius in saturated and subcooled pool boiling under atmospheric pressure. To predict the departure radius, the wall temperature and contact angle are two important input parameters. Instead of the static contact angle, the present correlations use the dynamic advancing contact angle at root of the bubble base at the moment before bubble detachment (i.e., the maximum dynamic advancing contact angle) to calculate the bubble departure radius. The results show that for the bubble departure radius obtained in this study, the developed correlation can predict all the data points within a maximum error of 3.8% in both normal earth gravity and 0.01ge reduced gravity. Moreover, for data sets in the literature including 1g saturated boiling, 1g subcooled boiling, saturated boiling in reduced gravity, and subcooled boiling in reduced gravity, it is also demonstrated that compared with the thirteen existing correlations, the proposed correlations exhibit a big improvement in predicting bubble departure radius. © 2018 Elsevier Ltd

Keyword :

Advancing contact angle Bubble detachments Force balance models Nucleate pool boiling Pool boiling Reduced gravity Static contact angle Sub-cooled boiling

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GB/T 7714 Wang, Xueli , Wu, Zan , Wei, Jinjia et al. Correlations for prediction of the bubble departure radius on smooth flat surface during nucleate pool boiling [J]. | International Journal of Heat and Mass Transfer , 2019 , 132 : 699-714 .
MLA Wang, Xueli et al. "Correlations for prediction of the bubble departure radius on smooth flat surface during nucleate pool boiling" . | International Journal of Heat and Mass Transfer 132 (2019) : 699-714 .
APA Wang, Xueli , Wu, Zan , Wei, Jinjia , Sundén, Bengt . Correlations for prediction of the bubble departure radius on smooth flat surface during nucleate pool boiling . | International Journal of Heat and Mass Transfer , 2019 , 132 , 699-714 .
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Investigation on Heat Transfer Performance and Micronization Boiling Phenomenon of Hydrophilic/Hydrophobic Surfaces EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (6) , 1373-1378 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

The boiling heat transfer performance of FC-72 was experimentally studied on hy- drophilic/hydrophobic surfaces based on micro-pin-finned structure. A high speed camera with microscope was applied to capture the micronization boiling phenomenon for the novel surfaces. From the comparison of the smooth chip and micro-pin-finned chip PF30-60 (micro-pin-fins with 30 µm fin side length and 60 µm fin height), it can be found that the hydrophilic/hydrophobic surfaces can efficiently decrease the wall temperature at the nucleate boiling onset, and can also decrease the wall superheat by 6∼9 K in the nucleate boiling region at the same heat flux. From the boiling phenomenon of the novel surface, it can be observed that large number of nucleation sites are formed in the micro-pin-finned area, and the hydrophilic property accelerates the departure of grown bubbles. These hydrophilic/hydrophobic surfaces can not only provide enough nucleation sites, but also prompt the bubble mergence and departure, enhancing boiling heat transfer greatly. © 2018, Science Press. All right reserved.

Keyword :

Boiling heat transfer Boiling heat transfer performance Heat transfer performance Hydrophilic properties Hydrophilic/hydrophobic Micronizations Nucleation sites Wall temperatures

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GB/T 7714 Kong, Xin , Wei, Jin-Jia , Zhang, Yong-Hai . Investigation on Heat Transfer Performance and Micronization Boiling Phenomenon of Hydrophilic/Hydrophobic Surfaces [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (6) : 1373-1378 .
MLA Kong, Xin et al. "Investigation on Heat Transfer Performance and Micronization Boiling Phenomenon of Hydrophilic/Hydrophobic Surfaces" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 6 (2018) : 1373-1378 .
APA Kong, Xin , Wei, Jin-Jia , Zhang, Yong-Hai . Investigation on Heat Transfer Performance and Micronization Boiling Phenomenon of Hydrophilic/Hydrophobic Surfaces . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (6) , 1373-1378 .
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A coupled volume of fluid and level set method based on analytic PLIC for unstructured quadrilateral grids EI SCIE Scopus
期刊论文 | 2018 , 73 (4) , 189-205 | NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

We develop a coupled volume of fluid and level set (VOSET) method for unstructured quadrilateral grids to simulate incompressible two-phase interfacial flows in irregular domains. In the method, an analytic piecewise linear interface calculation (PLIC) is first proposed and its solution speed is much faster (about five times) than that of Brent's iterative method; then an iterative geometric operation by which the level set function near interfaces can be calculated, is extended to unstructured quadrilateral grids; moreover, the volume fraction advection is solved by a Lagrangian-Eulerian advection scheme. Finally, the present method is validated by the single vortex flow problem, bubble rising problem and falling droplet problem. Our simulation results show good agreement with those in previous studies.

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GB/T 7714 Cao, Zhizhu , Sun, Dongliang , Yu, Bo et al. A coupled volume of fluid and level set method based on analytic PLIC for unstructured quadrilateral grids [J]. | NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS , 2018 , 73 (4) : 189-205 .
MLA Cao, Zhizhu et al. "A coupled volume of fluid and level set method based on analytic PLIC for unstructured quadrilateral grids" . | NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS 73 . 4 (2018) : 189-205 .
APA Cao, Zhizhu , Sun, Dongliang , Yu, Bo , Wei, Jinjia . A coupled volume of fluid and level set method based on analytic PLIC for unstructured quadrilateral grids . | NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS , 2018 , 73 (4) , 189-205 .
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The importance of controlling the upstream body wake in tandem cylinders system for noise reduction EI SCIE Scopus
期刊论文 | 2018 , 232 (3) , 517-531 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
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Abstract :

This work numerically investigates the importance of controlling the wake of upstream body in the tandem cylinders aiming at aerodynamics noise reduction. The two-dimensional unsteady Reynolds-averaged Navier-Stokes approach with the k- turbulence model and Ffowcs Williams-Hawkings method are employed to simulate the flow field and the aerodynamics noise, respectively. The flow in the porous media is calculated by a volume-averaged model. Analogy to the mass-spring-damper system, one preliminary model is proposed to reveal the key role of stabilizing the upstream body wake. The simulations of different porous materials coating designs are implemented to corroborate the model and provide more details of flow modification by porous materials coating. Results indicate that the porous materials coating designed on the upstream cylinder can decrease the wake impingement on the downstream cylinder via suppressing the vortex shedding. Subsequently, not only the tonal noise but also the broadband noise level of tandem system can be reduced. It is also clarified that the effects of downstream cylinder absorption and downstream cylinder wake control by porous materials coating is not comparable with the upstream cylinder wake control. The present study gives a new idea to flow control and noise reduction of the multibody systems considering efficiency and economy.

Keyword :

Wake interaction flow control tandem cylinders noise reduction porous materials coating

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GB/T 7714 Liu, Hanru , Wang, Yangang , Wei, Jinjia et al. The importance of controlling the upstream body wake in tandem cylinders system for noise reduction [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING , 2018 , 232 (3) : 517-531 .
MLA Liu, Hanru et al. "The importance of controlling the upstream body wake in tandem cylinders system for noise reduction" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING 232 . 3 (2018) : 517-531 .
APA Liu, Hanru , Wang, Yangang , Wei, Jinjia , Qu, Zhiguo . The importance of controlling the upstream body wake in tandem cylinders system for noise reduction . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING , 2018 , 232 (3) , 517-531 .
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Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure SCIE
期刊论文 | 2018 , 91 , 9-19 | EXPERIMENTAL THERMAL AND FLUID SCIENCE
WoS CC Cited Count: 5
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Abstract :

The pool boiling heat transfer performance of bistructured surface based on micro-pin-fmned structure was experimentally investigated in this study. A high speed camera with microscope was applied to capture the micronization boiling phenomenon and study the mechanism of bistructured surfaces. The micro-pin-finned area and the smooth area are fractally distributed on the heating surface by micromaching (dry etching) method. The P-doped silicon chips with 6 different surface types smooth chip, PF30-60 (micro-pin-fins with 30 pm fin side length and 60 gm fin height), PF30-60LS (large smooth strips distributed in micro-pin-finned area), PF30-60SS (small strips distributed in micro-pin-finned area), PF30-60LP (large smooth passages distributed in micro-pin finned area) and PF30-60SP (small passages distributed in micro-pin-finned area) were tested in FC-72. The experimental results indicate that the bistructured surfaces can efficiently enhance the heat transfer performance in the nucleate boiling region, and the critical heat flux (CHF) is also significantly improved. From the micronization boiling phenomenon it can be observed that the bistructured surfaces can lead to a more vitality of bubbles: large number of nucleation sites are formed in the micro-pin-finned area, and the small bubbles grow, collide, merge and move rapidly to the nearby smooth channel. When the bubble grows large enough, it will departure quickly under the force of channel pressure. The micronization phenomenon also reveals that the boundary lines between the structured and smooth areas are active nucleate site region.

Keyword :

Micronization phenomenon Micro-pin-fin Pool boiling Bistructured surface

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GB/T 7714 Kong, Xin , Zhang, Yonghai , Wei, Jinjia . Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 : 9-19 .
MLA Kong, Xin et al. "Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 91 (2018) : 9-19 .
APA Kong, Xin , Zhang, Yonghai , Wei, Jinjia . Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 , 9-19 .
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Experimental study on drag reduction performance of mixed polymer and surfactant solutions EI SCIE Scopus
期刊论文 | 2018 , 132 , 460-469 | CHEMICAL ENGINEERING RESEARCH & DESIGN
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

In this work, the mixed aqueous solutions of cationic surfactant - cetyltrimethyl ammonium chloride and non-ionic molecular polymer - polyacrylamide were tested to verify the speculation about their intensification possibilities of drag reduction performance. Sodium salicylate (NaSal) was used as the counter-ion salt. Six different combinations of mixed solution concentrations were tested at different temperatures ranging from 25 degrees C to 50 degrees C. Pure surfactant and polymer solutions were tested as control couples. It was found that the curves of mixed solutions could be divided into enhanced drag reduction zone, stable drag reduction zone and destroyed drag reduction zone. Surfactant molecules form micelles round polymer chains. Then the two additives form a kind of reinforced concrete structures, which were more complex and more effective in restrain vortices, leading to the intensification of drag reduction in enhanced zone and stable zone compared to pure surfactant solutions at low temperatures. The addition of polymers also increased drag reduction efficiency in destroyed zone by providing a wider range of Reynolds numbers. In addition, the results indicated that temperatures were more influential than concentrations, raising the temperature to change the structures of solution is more effective than increasing the quantity of structures. (C) 2018 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Keyword :

Synergistic effect Nonionic polymer Temperature Cationic surfactant Drag reduction

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GB/T 7714 Liu, Dongjie , Wang, Qinghui , Wei, Jinjia . Experimental study on drag reduction performance of mixed polymer and surfactant solutions [J]. | CHEMICAL ENGINEERING RESEARCH & DESIGN , 2018 , 132 : 460-469 .
MLA Liu, Dongjie et al. "Experimental study on drag reduction performance of mixed polymer and surfactant solutions" . | CHEMICAL ENGINEERING RESEARCH & DESIGN 132 (2018) : 460-469 .
APA Liu, Dongjie , Wang, Qinghui , Wei, Jinjia . Experimental study on drag reduction performance of mixed polymer and surfactant solutions . | CHEMICAL ENGINEERING RESEARCH & DESIGN , 2018 , 132 , 460-469 .
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CHF correlation of boiling in FC-72 with micro-pin-fins for electronics cooling EI SCIE Scopus
期刊论文 | 2018 , 138 , 494-500 | APPLIED THERMAL ENGINEERING
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Abstract :

An experimental study of pool boiling heat transfer was conducted for micro-pin-finned surfaces with different pitches (45, 60, and 75 mu m) and configurations. The experimental conditions covered three different liquid subcoolings (15, 25, and 35 K), and dielectric liquid FC-72 was used as working fluid. The dimension of the silicon chips is 10 x 10 x 0.5 mm(3) (length x width x thickness). For comparison, experiments on a smooth surface named chip S were also conducted. It is found that the fin pitch and configuration have significant effects on the boiling heat transfer coefficient as well as critical heat flux. Considering the surface area enhancement ratio (A(pp)/A(s)), dimensionless number representing flow resistance (D-h/L-c, named capillary-resistance number), porosity (phi) and liquid subcooling (Delta T-sub), a correlation to predict CHF for different micro-pin-finned surfaces was proposed. The prediction results agree quite well with the experimental data within +/- 8%.

Keyword :

Correlation Enhanced heat transfer Pool boiling CHF Micro-pin-fins

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GB/T 7714 Zhang, Yonghai , Zhou, Jie , Zhou, Wenjing et al. CHF correlation of boiling in FC-72 with micro-pin-fins for electronics cooling [J]. | APPLIED THERMAL ENGINEERING , 2018 , 138 : 494-500 .
MLA Zhang, Yonghai et al. "CHF correlation of boiling in FC-72 with micro-pin-fins for electronics cooling" . | APPLIED THERMAL ENGINEERING 138 (2018) : 494-500 .
APA Zhang, Yonghai , Zhou, Jie , Zhou, Wenjing , Qi, Baojin , Wei, Jinjia . CHF correlation of boiling in FC-72 with micro-pin-fins for electronics cooling . | APPLIED THERMAL ENGINEERING , 2018 , 138 , 494-500 .
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Direct numerical simulation of surfactant solution flow in the wide-rib rectangular grooved channel SCIE Scopus
期刊论文 | 2018 , 64 (7) , 2898-2912 | AICHE JOURNAL
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The turbulent flow of surfactant solution in the wide-rib rectangular grooved channels was studied by direct numerical simulation. Moreover, the variations of near-wall streamwise vortices with time were discussed and the distributions of streamwise vortex radius, swirling strength and density were quantitatively investigated. It was found that the influence of microgrooves on the fluid mainly occurred within the buffer layer and microgrooves could induce numerous streamwise vortices with small size and swirling strength within the grooved valleys. The drag-reducing enhancement mechanism of microgroove in the surfactant solution could be mainly considered as the competing results between the restriction effect and tip effect of microgroove, and the essential factor should be the numerous secondary streamwise vortices with small size and swirling strength within the grooved valleys. Furthermore, a predicted method for the optimal drag-reducing size of microgroove was proposed, and the prediction values agreed well with the numerical results. (c) 2018 American Institute of Chemical Engineers AIChE J, 64: 2898-2912, 2018

Keyword :

direct numerical simulation vortices microgroove drag reduction surfactant solution

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GB/T 7714 Huang, Chonghai , Liu, Dongjie , Wei, Jinjia et al. Direct numerical simulation of surfactant solution flow in the wide-rib rectangular grooved channel [J]. | AICHE JOURNAL , 2018 , 64 (7) : 2898-2912 .
MLA Huang, Chonghai et al. "Direct numerical simulation of surfactant solution flow in the wide-rib rectangular grooved channel" . | AICHE JOURNAL 64 . 7 (2018) : 2898-2912 .
APA Huang, Chonghai , Liu, Dongjie , Wei, Jinjia , Yu, Bo , Zhang, Hongna , Cheng, Jianping . Direct numerical simulation of surfactant solution flow in the wide-rib rectangular grooved channel . | AICHE JOURNAL , 2018 , 64 (7) , 2898-2912 .
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