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学者姓名:郭烈锦

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< Page ,Total 88 >
Intelligent identification of steam jet condensation regime in water pipe flow system by wavelet multiresolution analysis of pressure oscillation and artificial neural network EI Scopus SCIE
期刊论文 | 2019 , 147 , 1047-1058 | Applied Thermal Engineering
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Abstract :

© 2018 Elsevier Ltd On-line recognition of condensation regime of vapor jet in pipe flow systems is a promising approach for flow assurance and intellectualization of industrial processes. However, the selection of distinguishable characteristics from pressure signals associated strongly with various condensation regimes is essential and challenging for satisfactory recognition purpose. Accordingly, an artificial neural network technique using wavelet multiresolution analysis of pressure oscillation signals for objective identification of jet condensation regimes is presented in this paper. The recognition procedure was carried out in two major steps. Statistical features of wavelet multiresolution analysis of pressure signals, i.e., mean of absolute and percentage of energy of each wavelet scale, were chose first. And then artificial neural network was adopted to construct classifiers for forecasting the condensation regimes automatically. The recognition results illustrated that the proposed method is feasible and effective for identifying vapor jet condensation regime in pipe flow system. Furthermore, it is suggested that statistical features of mean of absolute and percentage of energy at least four or more particular wavelet scales, and also sample length longer than 1.5 s could guarantee a satisfactory recognition rate above 90%.

Keyword :

Artificial neural network Condensation regime recognition Multiphase flow Pressure oscillation Wavelet multiresolution analysis

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GB/T 7714 Xu, Qiang , Ye, Shuyan , Liu, Weizhi et al. Intelligent identification of steam jet condensation regime in water pipe flow system by wavelet multiresolution analysis of pressure oscillation and artificial neural network [J]. | Applied Thermal Engineering , 2019 , 147 : 1047-1058 .
MLA Xu, Qiang et al. "Intelligent identification of steam jet condensation regime in water pipe flow system by wavelet multiresolution analysis of pressure oscillation and artificial neural network" . | Applied Thermal Engineering 147 (2019) : 1047-1058 .
APA Xu, Qiang , Ye, Shuyan , Liu, Weizhi , Chen, Yanshuang , Chen, Qiyu , Guo, Liejin . Intelligent identification of steam jet condensation regime in water pipe flow system by wavelet multiresolution analysis of pressure oscillation and artificial neural network . | Applied Thermal Engineering , 2019 , 147 , 1047-1058 .
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Investigation on Characteristics of Bubble Nucleation, Growth and Detachment During Photochemical Catalysis EI
期刊论文 | 2018 , 39 (7) , 1488-1492 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

Bubble dynamics in photochemical catalysis process is an important parameter to study gas-liquid two phase flow behavior, which has a significant effect on the efficiency of water splitting and the heat and mass transfer during the reaction process. In this paper, an experimental system to investigate the dynamic characteristics of O2 bubbles envolved from the TiO2 photoelectrode surface is designed. The law of O2 bubble evolution followed d ∝ tx, which x equaled to 0.5~0.85 within bubble formation 10 ms, and x ≈ 0.33 after 10 ms. The images of bubble nucleation initial stage were captured. The bubble nucleation spatiotemporal scale was obtained by optical method. Finally, the influence of laser power and constant bias on bubble detachment diameter was also presented. © 2018, Science Press. All right reserved.

Keyword :

Bubble growth Bubble nucleation Detachment diameter Oxygen bubbles Photoelectrode

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GB/T 7714 Cao, Zhen-Shan , Guo, Lie-Jin , Wang, Ye-Chun et al. Investigation on Characteristics of Bubble Nucleation, Growth and Detachment During Photochemical Catalysis [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (7) : 1488-1492 .
MLA Cao, Zhen-Shan et al. "Investigation on Characteristics of Bubble Nucleation, Growth and Detachment During Photochemical Catalysis" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 7 (2018) : 1488-1492 .
APA Cao, Zhen-Shan , Guo, Lie-Jin , Wang, Ye-Chun , Hu, Xiao-Wei , Chen, Juan-Wen . Investigation on Characteristics of Bubble Nucleation, Growth and Detachment During Photochemical Catalysis . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (7) , 1488-1492 .
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Study on Bubble Interaction on TiO2 Photoelectrode EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (3) , 550-554 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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In this study, the interaction of bubbles evolving on TiO2photoanode is experimentally studied. It is found that the bubbles generated in the center of reaction zone attract the bubbles nucleated on the surface defect, resulting in bubble collision and coalescence. Marangoni convection is analyzed to play an important role in the bubble interaction. When the bubble coalescence occurs, the bubble evolving cycles become shorter and stable, which increases the bubble evolving efficiency and further reduces the saturation on the surface as well as the overpotential. © 2018, Science Press. All right reserved.

Keyword :

Bubble coalescence Bubble collision Bubble interaction Gas evolution Marangoni convection Marangoni effects Photoelectrochemical water splitting Photoelectrode

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GB/T 7714 Chen, Juan-Wen , Guo, Lie-Jin , Hu, Xiao-Wei et al. Study on Bubble Interaction on TiO2 Photoelectrode [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (3) : 550-554 .
MLA Chen, Juan-Wen et al. "Study on Bubble Interaction on TiO2 Photoelectrode" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 3 (2018) : 550-554 .
APA Chen, Juan-Wen , Guo, Lie-Jin , Hu, Xiao-Wei , Cao, Zhen-Shan . Study on Bubble Interaction on TiO2 Photoelectrode . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (3) , 550-554 .
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Assessment of sugarcane bagasse gasification in supercritical water for hydrogen production EI CPCI-S SCIE Scopus
会议论文 | 2018 , 43 (30) , 13711-13719 | 8th International Conference on Hydrogen Production (ICH2P)
WoS CC Cited Count: 2
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Abstract :

Sugarcane bagasse is one of the major resources of agricultural biomass waste in the world. In this work, supercritical water gasification characteristics of sugarcane bagasse were investigated. The effect of temperature (600-750 degrees C), concentration (3-12 wt%), residence time (5-20 min) and catalysts (Raney-Ni, K2CO3 and Na2CO3) on bagasse gasification were studied. A kinetic study on the non-catalytic and Na2CO3 catalytic bagasse gasification was conducted to describe the kinetic information of the bagasse gasification reaction. The results showed that a higher reaction temperature, a lower bagasse concentration and a longer residence time could favor the gasification of bagasse, leading to a higher hydrogen yield. Bagasse was nearly completely gasified at 750 degrees C without using any catalyst and the carbon gasification efficiency could reach up to 96.28%. The addition of employed catalysts remarkably promoted the bagasse gasification reactivity. The maximum hydrogen yield (35.3 moVkg) was achieved at 650 degrees C with the Na2CO3 loading of 20 wt%. The experimental data fitted well with a homogeneous model based on a Pseudo first -order reaction hypothesis. The kinetic study showed that Na2CO3 catalyst could lower the activation energy Ea of bagasse gasification from 117.88 kJ/mol to 78.25 kJ/mol. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Supercritical water Kinetic study Sugarcane bagasse Hydrogen production catalyst

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GB/T 7714 Cao, Wen , Guo, Liejin , Yan, Xuecheng et al. Assessment of sugarcane bagasse gasification in supercritical water for hydrogen production [C] . 2018 : 13711-13719 .
MLA Cao, Wen et al. "Assessment of sugarcane bagasse gasification in supercritical water for hydrogen production" . (2018) : 13711-13719 .
APA Cao, Wen , Guo, Liejin , Yan, Xuecheng , Zhang, Deming , Yao, Xiangdong . Assessment of sugarcane bagasse gasification in supercritical water for hydrogen production . (2018) : 13711-13719 .
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Condensation regime diagram for supersonic and subsonic steam jet condensation in water flow in a vertical pipe EI SCIE Scopus
期刊论文 | 2018 , 130 , 62-73 | APPLIED THERMAL ENGINEERING
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Abstract :

An experimental research is performed to investigate the condensation regime diagram of supersonic and subsonic steam jet condensation in water flow in pipes. The original images of the jet plume are recorded using a visualization window and a high-speed camera. The jet condensation regimes are basically categorized into four types, including Chugging, Oscil-I, Oscil-II and Stable regimes, primarily based on the transient evolution of geometrical profile of the jet plume. And the average geometrical shape of the jet plume is found to shrink gradually with increase of ambient pressure. The stand deviation of pressure oscillation is highly correlated to jet condensation regimes, so it can be applied to quantitatively categorize different regimes. The steam mass flux, scaled by critical steam mass flux at different ambient pressure, is found to be irrelevant to the transitional lines among Chugging, Oscil-I, and "Stable or Oscil-II" regimes in the condensation regime diagram. Furthermore, the Oscil-II regime can be simply isolated from the "Stable or Oscil-II" regime via comparison of the standard deviation of pressure oscillation in this two regimes. Therefore, the jet condensation regime diagram obtained from low ambient pressure could be applied to conditions of elevated ambient pressure. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Condensation regime diagram Regime classification Pressure oscillation Supersonic steam jet Multiphase flow

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GB/T 7714 Xu, Qiang , Ye, Shuyan , Chen, Yanshuang et al. Condensation regime diagram for supersonic and subsonic steam jet condensation in water flow in a vertical pipe [J]. | APPLIED THERMAL ENGINEERING , 2018 , 130 : 62-73 .
MLA Xu, Qiang et al. "Condensation regime diagram for supersonic and subsonic steam jet condensation in water flow in a vertical pipe" . | APPLIED THERMAL ENGINEERING 130 (2018) : 62-73 .
APA Xu, Qiang , Ye, Shuyan , Chen, Yanshuang , Chen, Qiyu , Guo, Liejin . Condensation regime diagram for supersonic and subsonic steam jet condensation in water flow in a vertical pipe . | APPLIED THERMAL ENGINEERING , 2018 , 130 , 62-73 .
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Dynamics of single bubble departure from TiO2 nanorod-array photoelectrode EI SCIE Scopus
期刊论文 | 2018 , 274 , 57-66 | ELECTROCHIMICA ACTA
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Bubble evolution from photo(electro) catalytic water splitting plays a vital role in the interfacial mass transport on photocatalyst surface. However, little success has been achieved to optimize this process, restricted by the poor understanding. Herein, taking photoelectrochemical (PEC) water splitting over a titanium dioxide (TiO2) nanorod-array electrode as a model system, experiments were performed to study single oxygen bubble dynamics by combining electrochemical measurement and high-speed microscopic imaging. The experimental results indicate that the departure of bubble from photo-electrode is retarded by light irradiation, but the traditional bubble departure criterions fail to predict the bubble departure diameters especially in high light intensity. Additional analysis reveals that the light irradiation causes the Marangoni force acting on the evolving bubble, because it induces temperature rise and generates dissolved gas. A modified force balance model for bubble departure from photoelectrode was developed by adding Marangoni force. This modified model that takes account of the light-induced temperature rise and the dissolved gas, agrees well with the experimental data and can be extended to other photo(electro) catalytic reactions. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Bubble dynamics Photoelectrochemical water splitting Bubble departure Gas-evolving electrode

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GB/T 7714 Chen, Juanwen , Guo, Liejin , Hu, Xiaowei et al. Dynamics of single bubble departure from TiO2 nanorod-array photoelectrode [J]. | ELECTROCHIMICA ACTA , 2018 , 274 : 57-66 .
MLA Chen, Juanwen et al. "Dynamics of single bubble departure from TiO2 nanorod-array photoelectrode" . | ELECTROCHIMICA ACTA 274 (2018) : 57-66 .
APA Chen, Juanwen , Guo, Liejin , Hu, Xiaowei , Cao, Zhenshan , Wang, Yechun . Dynamics of single bubble departure from TiO2 nanorod-array photoelectrode . | ELECTROCHIMICA ACTA , 2018 , 274 , 57-66 .
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Gasification of guaiacol in supercritical water: Detailed reaction pathway and mechanisms EI SCIE Scopus
期刊论文 | 2018 , 43 (31) , 14078-14086 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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Supercritical water gasification of guaiacol as a model compound for lignin was conducted in quartz reactors. The formation and degradation pathways of intermediates were discussed. The results show that the gasification efficiency of guaiacol in supercritical water increased as the reaction time increased. The intermediates in the residual liquid consisted mainly of phenols, arenes, cyclopentanones, alcohols and organic acids. Phenols and arenes were difficult to be gasified in supercritical water and easily turned into char and tar while cyclopentanones, alcohols and organic acids could be easily gasified and turn into hydrogen-rich gas. The Ru/Al2O3 catalyst promoted the degradation of phenols and arenes and thus inhibited the formation of char and tar. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Supercritical water Lignin Guaiacol Gasification Reaction pathway

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GB/T 7714 Zhu, Chao , Guo, Liejin , Jin, Hui et al. Gasification of guaiacol in supercritical water: Detailed reaction pathway and mechanisms [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2018 , 43 (31) : 14078-14086 .
MLA Zhu, Chao et al. "Gasification of guaiacol in supercritical water: Detailed reaction pathway and mechanisms" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 43 . 31 (2018) : 14078-14086 .
APA Zhu, Chao , Guo, Liejin , Jin, Hui , Ou, Zhisong , Wei, Wenwen , Huang, Jianbing . Gasification of guaiacol in supercritical water: Detailed reaction pathway and mechanisms . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2018 , 43 (31) , 14078-14086 .
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First-Principles Study on Stability and HER Activity of Noble Metal Single Atoms on TiO2: The Effect of Loading Density EI SCIE Scopus
期刊论文 | 2018 , 122 (5) , 2546-2553 | JOURNAL OF PHYSICAL CHEMISTRY C
WoS CC Cited Count: 1
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The highly dispersed "single-atom (SA)" catalysts on oxide supports significantly alter the catalytic reaction activity and selectivity and meanwhile save the catalyst utilization. However, preparation of SA catalysts remains a challenge up to now. An approach effectively evaluating the stability and activity is required. Herein, density functional theory (DFT)-based first-principles calculations were performed to evaluate the stability and photocatalytic hydrogen evolution reaction (HER) activity of noble metal (NM = Ag, Au, Pd, and Pt) SAs loaded on TiO2 support. The chemical potential-based thermodynamic model was employed to estimate the stability of SAs; the capability to trap photoelectrons on surface and free energy of hydrogen adsorption were used to estimate the photocatalytic HER activity of SAs. Compared to the (101) surface, the (001) surface is more feasible for preparation of NM SAs due to the "soft" structural character caused by incompletely saturated surface atoms. The stability of SAs on the (001) is getting better with the loading density lowering except for Au SA. After deposition of NM SAs on the (001), the photoelectron was extracted from the subsurface to the surface around the NM sites, facilitating the proton adsorption and reduction process. The calculated free energy of hydrogen adsorption shows that the photocatalytic HER activity of NM SAs on the (001) changes moderately with the loading density but is very different than those for the TiO2 clean (001) and bulk NM (111). Both stability and activity evaluations dictate that Pd SA on the (001) is the most promising candidate catalyst for photocatalytic HER

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GB/T 7714 Han, Fengshuang , Zhou, Zhaohui , Zhang, Xiaohai et al. First-Principles Study on Stability and HER Activity of Noble Metal Single Atoms on TiO2: The Effect of Loading Density [J]. | JOURNAL OF PHYSICAL CHEMISTRY C , 2018 , 122 (5) : 2546-2553 .
MLA Han, Fengshuang et al. "First-Principles Study on Stability and HER Activity of Noble Metal Single Atoms on TiO2: The Effect of Loading Density" . | JOURNAL OF PHYSICAL CHEMISTRY C 122 . 5 (2018) : 2546-2553 .
APA Han, Fengshuang , Zhou, Zhaohui , Zhang, Xiaohai , Huang, Zhenxiong , Li, Mingtao , Guo, Liejin . First-Principles Study on Stability and HER Activity of Noble Metal Single Atoms on TiO2: The Effect of Loading Density . | JOURNAL OF PHYSICAL CHEMISTRY C , 2018 , 122 (5) , 2546-2553 .
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Gasification of unsymmetrical dimethylhydrazine in supercritical water: Reaction pathway and kinetics EI SCIE Scopus
期刊论文 | 2018 , 43 (18) , 8644-8654 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
SCOPUS Cited Count: 2
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Unsymmetrical dimethylhydrazine (UDMH) is a high N-containing (as much as nearly 50%) substance. Traditional treatment methods such as incineration will inevitably cause the formation of nitric oxide and secondary pollution. Supercritical water is a preferred transformation medium due to its unique physicochemical properties. However, at present most of studies are limited to supercritical water oxidation (SCWO) which tends to produce hydrogen nitrate resulting in corrosion to the reactor. To conquer this problem, we propose supercritical water gasification (SCWG) technology which is in a reducing environment, realizing both harmless treatment and resource utilization. In order to promote its industrialization process, the reaction pathways and kinetic parameters should be studied. In this paper, the reaction pathways and kinetics of UDMH in supercritical water were conducted under the conditions of 400 C-degrees-550 C-degrees in quartz reactor, which avoids the catalytic effect on the reaction kinetics. From the resource utilization perspective, the most abundant quantitatively detectable gaseous product is methane, together with less hydrogen, carbon monoxide and ethane orderly. All these gaseous products are combustible. The maximum of carbon efficiency is 90.25% at 550 C-degrees, 10 min. In the point of view of harmless treatment, the organic compounds contained in the residual liquid are detected with H-1 NMR, FTIR and GC/MS. Results show that UDMH could be fully degraded within 3 min and the ultimate organic compounds in the residual liquid are mainly dimethylamino acetonitrile and trimethylamine. In addition, a reaction pathway for UDMH disposed in supercritical water is developed. Finally, the quantitative kinetic model for describing the gaseous products and ammonia-nitrogen in the residual liquid is brought forward. The pyrolysis activation energy for UDMH in supercritical water is 49.98 +/- 7.38 kJ/mol. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

SCWG Kinetics Harmless treatment UDMH Reaction pathway Resource utilization

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GB/T 7714 Yi, Lei , Guo, Liejin , Jin, Hui et al. Gasification of unsymmetrical dimethylhydrazine in supercritical water: Reaction pathway and kinetics [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2018 , 43 (18) : 8644-8654 .
MLA Yi, Lei et al. "Gasification of unsymmetrical dimethylhydrazine in supercritical water: Reaction pathway and kinetics" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 43 . 18 (2018) : 8644-8654 .
APA Yi, Lei , Guo, Liejin , Jin, Hui , Kou, Jiajing , Zhang, Deming , Wang, Runyu . Gasification of unsymmetrical dimethylhydrazine in supercritical water: Reaction pathway and kinetics . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2018 , 43 (18) , 8644-8654 .
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Investigation and prediction of severe slugging frequency in pipeline-riser systems EI SCIE Scopus
期刊论文 | 2018 , 184 , 72-84 | CHEMICAL ENGINEERING SCIENCE
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Severe slugging is one of the flow assurance concerns in oil and gas industry because of the undesired fluctuations of pressure and flow rates in the system. Knowledge of severe slugging frequency is essential for the receiving facility design. However, unlike the considerable investigations of normal slug frequency in horizontal and inclined pipes, little work has been done to predict severe slugging frequency. In this work, an experimental study of air-water two-phase flow was conducted in a long pipeline-riser system. According to the riser pressure drop signals and the power spectral density (PSD) distributions, flow patterns were classified into classical severe slugging, transitional severe slugging, oscillating flow and stable flow. The effect of riser-top choking on classical and transitional severe slugging frequency were analyzed. Based on a broad range experimental database from ten flow loops, the effect of dimensionless pipeline length on severe slugging frequency was analyzed and an empirical correlation was developed to predict severe slugging frequency. Good matches with literature data demonstrated the validation of the empirical correlation. The severe slugging frequency correlation was applied to predict severe slugging length and derive a new transition criterion between classical severe slugging and transitional severe slugging in the flow pattern map. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Transition criterion Severe slugging frequency Riser-top choking Empirical correlation

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GB/T 7714 Zhou, Hongliang , Guo, Liejin , Yan, Han et al. Investigation and prediction of severe slugging frequency in pipeline-riser systems [J]. | CHEMICAL ENGINEERING SCIENCE , 2018 , 184 : 72-84 .
MLA Zhou, Hongliang et al. "Investigation and prediction of severe slugging frequency in pipeline-riser systems" . | CHEMICAL ENGINEERING SCIENCE 184 (2018) : 72-84 .
APA Zhou, Hongliang , Guo, Liejin , Yan, Han , Kuang, Shicai . Investigation and prediction of severe slugging frequency in pipeline-riser systems . | CHEMICAL ENGINEERING SCIENCE , 2018 , 184 , 72-84 .
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