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< Page ,Total 42 >
Experimental Study on the Local Heat Transfer Characteristics in the Direct Contact Condensation of Steam Jet with Subcooled Water EI Scopus CSCD PKU
期刊论文 | 2018 , 52 (9) , 134-139 and 147 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

Aiming at the direct contact condensation process of steam jet with subcooled water, a visualized experimental rig composed of rectangular steam nozzle and mixing chamber was designed and built. The flow field was observed when the steam mass flux, water mass flux and water temperature were in the range of 200 - 600 kg·m-2·s-1, 4 - 18 t·m-2·s-1 and 20 - 50 ℃, respectively. The steam-water interfacial fluctuation was investigated by image processing techniques, and a model for calculating local heat transfer coefficients was established. Besides, the relationship between interfacial fluctuation and local heat transfer characteristic was also studied. The results indicate that the interfacial wave observed in the research implies an interfacial instability, the interfacial wave amplitude and local heat transfer coefficient increase along the interface, and a relatively great local heat transfer coefficient can be achieved at steam jet tail. Furthermore, the interfacial fluctuation can enhance the heat and mass transfer in the condensation process of steam jet in water flow. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

Keyword :

Condensation heat transfer Direct contact condensation Image processing technique Interfacial fluctuations Interfacial instability Local heat transfer coefficient Steam injector Steam jet

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GB/T 7714 Zong, Xiao , Liu, Hao , Yang, Chengshi et al. Experimental Study on the Local Heat Transfer Characteristics in the Direct Contact Condensation of Steam Jet with Subcooled Water [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (9) : 134-139 and 147 .
MLA Zong, Xiao et al. "Experimental Study on the Local Heat Transfer Characteristics in the Direct Contact Condensation of Steam Jet with Subcooled Water" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 52 . 9 (2018) : 134-139 and 147 .
APA Zong, Xiao , Liu, Hao , Yang, Chengshi , Yan, Junjie , Liu, Jiping . Experimental Study on the Local Heat Transfer Characteristics in the Direct Contact Condensation of Steam Jet with Subcooled Water . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (9) , 134-139 and 147 .
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激光波长对LIBS测量气体中微量元素的影响 CSCD PKU
期刊论文 | 2018 , (2) , 127-131 | 动力工程学报
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Abstract :

采用具备实现微量元素快速精确在线分析潜力的激光诱导击穿光谱(LIBS)技术,测量气体中微量元素的含量.搭建了LIBS测量气体中微量元素实验系统,以气体中微量元素Hg和I为研究对象,分析了不同激光波长对低压LIBS测量气体中微量元素的影响及其变化规律.结果表明:降低压力能够显著提高LIBS的检测能力;在不同压力时,532 nm激光波长的微量元素检测能力均高于1 064 nm激光波长.

Keyword :

激光波长 激光诱导击穿光谱 压力 微量元素

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GB/T 7714 王珍珍 , 张臻臻 , 严俊杰 et al. 激光波长对LIBS测量气体中微量元素的影响 [J]. | 动力工程学报 , 2018 , (2) : 127-131 .
MLA 王珍珍 et al. "激光波长对LIBS测量气体中微量元素的影响" . | 动力工程学报 2 (2018) : 127-131 .
APA 王珍珍 , 张臻臻 , 严俊杰 , 刘继平 , 种道彤 . 激光波长对LIBS测量气体中微量元素的影响 . | 动力工程学报 , 2018 , (2) , 127-131 .
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Quantitative Analysis of Unburned Carbon in Fly Ash by Laser-induced Breakdown Spectroscopy EI
期刊论文 | 2018 , 47 (8) | Guangzi Xuebao/Acta Photonica Sinica
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Abstract :

To verify the ability of LIBS to measure the change of carbon content in fly ash, in this study, 24 samples with different carbon content were obtained by mixing pulverized coal and fly ash in a certain proportion. Spectra of these samples from LIBS were studied in different delay time. The emission intensity ratio of IMg1/IMg2 decreases with the increase of delay time. The emission intensity ratio of fly ash samples is obviously higher than that of other samples mixed with pulverized coal. The emission intensity ratio of IAl/ISi1 decreases with the increase of IMg1/IMg2. The addition of pulverized coal in the fly ash sample has a significant influence on the temperature change of plasma. By introducing the method of multivariate analysis, the ratios of spectral lines intensity of elements such as C, Al, Mg, Ca, Fe to that of Si element were calculated as the independent variable of multivariate regression analysis, and the concentration of carbon element was taken as dependent variable, and the regression equation under different delay time was established. The results showed that the errors between the predicted values and the reference values based on the regression model were within 9%. © 2018, Science Press. All right reserved.

Keyword :

Delay Time Emission intensity ratio Independent variables Multi variate analysis Multiple regressions Multivariate regression analysis Temperature changes Unburned carbon in fly ashes

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GB/T 7714 Hu, Ruo-Mu , Wang, Zhen-Zhen , Liu, Ren-Wei et al. Quantitative Analysis of Unburned Carbon in Fly Ash by Laser-induced Breakdown Spectroscopy [J]. | Guangzi Xuebao/Acta Photonica Sinica , 2018 , 47 (8) .
MLA Hu, Ruo-Mu et al. "Quantitative Analysis of Unburned Carbon in Fly Ash by Laser-induced Breakdown Spectroscopy" . | Guangzi Xuebao/Acta Photonica Sinica 47 . 8 (2018) .
APA Hu, Ruo-Mu , Wang, Zhen-Zhen , Liu, Ren-Wei , Zhou, Wang-Zheng , Liu, Ji-Ping , Yan, Jun-Jie et al. Quantitative Analysis of Unburned Carbon in Fly Ash by Laser-induced Breakdown Spectroscopy . | Guangzi Xuebao/Acta Photonica Sinica , 2018 , 47 (8) .
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Experimental research on convection?condensation heat transfer characteristics and sootblowing operation strategy of waste heat recovery heat exchanger for dryer exhaust EI
期刊论文 | 2018 | Drying Technology
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In this study, air/water vapor mixture with ash particles was used to simulate actual dryer exhaust gas. An experimental study of the convection–condensation heat transfer characteristics of air/vapor mixtures with ash particles across horizontal tube-bundles was conducted under various water vapor mass fractions and concentrations of ash particles. The variation of convection–condensation heat transfer coefficient with time presented four different types, as follows: almost did not change with time; decreased first, then reached stable values; decreased continuously in the experimental time; and decreased rapidly, decreased slowly, and decreased rapidly, with potential to increase again. In general, the convection–condensation heat transfer coefficient decreased with increasing concentration of ash particles and increased with increasing water vapor mass fraction. The reducing effect on the convection–condensation heat transfer coefficient by ash deposition would be weakened by increasing the water vapor mass fraction, but the heat exchanger would be blocked further easily by increasing the concentration of ash particles. Then, a distribution diagram was drawn to present different types of convection–condensation heat transfer curves under various working parameters. Sootblowing operation strategies were proposed under different working conditions to provide reference for the actual operation of the waste heat recovery heat exchanger for dryer exhaust. © 2018, © 2018 Taylor & Francis Group, LLC.

Keyword :

Ash deposition Ash particles Condensation heat transfer Condensation heat transfer coefficients Distribution diagram Experimental research Operation strategy Working parameters

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GB/T 7714 Qin, Yuanzhi , Wang, Jinshi , Liu, Yiwen et al. Experimental research on convection?condensation heat transfer characteristics and sootblowing operation strategy of waste heat recovery heat exchanger for dryer exhaust [J]. | Drying Technology , 2018 .
MLA Qin, Yuanzhi et al. "Experimental research on convection?condensation heat transfer characteristics and sootblowing operation strategy of waste heat recovery heat exchanger for dryer exhaust" . | Drying Technology (2018) .
APA Qin, Yuanzhi , Wang, Jinshi , Liu, Yiwen , Duan, Yifei , Liu, Ming , Yan, Junjie . Experimental research on convection?condensation heat transfer characteristics and sootblowing operation strategy of waste heat recovery heat exchanger for dryer exhaust . | Drying Technology , 2018 .
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Waste heat and water recovery characteristics of heat exchangers for dryer exhaust EI SCIE Scopus
期刊论文 | 2018 , 36 (6) , 709-722 | DRYING TECHNOLOGY
WoS CC Cited Count: 1 SCOPUS Cited Count: 4
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Abstract :

In many industrial drying processes, water is evaporated in the drying section by a large volume of fresh air supply, which contains a large amount of sensible and latent heat. Recovering heat and water from the dryer exhaust is a potential way to realize energy and water conservation in drying systems. In this paper, the experimental and theoretical investigations of the waste heat and water recovery characteristics of heat exchangers for dryer exhaust are presented. A hot air and water vapor mixture was used to simulate dryer exhaust. Convection-condensation heat transfer and water recovery characteristics were first obtained under various water vapor mass fractions, flow velocities, and humid air inlet temperatures through experiments, which revealed that the convection-condensation heat transfer coefficient increased with the increase in water vapor mass fraction and humid air velocity, and decreased with the increase in inlet temperature. The condensed water rate increased with the increase in water vapor mass fraction and humid air velocity, while inlet temperature had almost no effect on it. The condensing ratio decreased with the increase in water vapor mass fraction and humid air velocity, while improving the inlet temperature slightly reduced it. Then, a theoretical calculation model was developed to predict the heat and water recovery characteristics of heat exchangers under a wide working condition. In this model, the pipe and suction effects caused by condensation on the tube wall were considered. The properties of humid air were changed according to the temperature and vapor content instead of regarding them as constant values. The calculation results were compared with the present experimental data and those of previous studies. The good prediction accuracy and the universality of the present model were verified. This study is of great significance to the design of heat exchangers.

Keyword :

theoretical model experiments water recovery Dryer exhaust heat recovery

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GB/T 7714 Qin, Yuanzhi , Fu, Hao , Wang, Jinshi et al. Waste heat and water recovery characteristics of heat exchangers for dryer exhaust [J]. | DRYING TECHNOLOGY , 2018 , 36 (6) : 709-722 .
MLA Qin, Yuanzhi et al. "Waste heat and water recovery characteristics of heat exchangers for dryer exhaust" . | DRYING TECHNOLOGY 36 . 6 (2018) : 709-722 .
APA Qin, Yuanzhi , Fu, Hao , Wang, Jinshi , Liu, Ming , Yan, Junjie . Waste heat and water recovery characteristics of heat exchangers for dryer exhaust . | DRYING TECHNOLOGY , 2018 , 36 (6) , 709-722 .
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Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes EI CPCI-S SCIE Scopus
会议论文 | 2018 , 39 (7-8) , 700-710 | 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT)
SCOPUS Cited Count: 1
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Abstract :

Supersonic ejectors involve very complex phenomena such as interaction between supersonic and subsonic flows, shock trains, instabilities, which strongly influences the performance of supersonic ejector. In this study, the static pressure distribution along the ejector wall and Mach number distribution along the axis are used to investigate the internal flow field of supersonic ejector. Results indicate that when the back pressure is much less than the critical back pressure, there are two series of shock trains, and the change of the back pressure will not affect the flow field before the effective area section, so the entrainment ratio would remain constant. The second shock train moves further upstream and is combined with the first shock train to form a single shock train as the back pressure rises. When the back pressure is greater than the critical back pressure, the position of the shock train, the static pressure at its upstream and the entrainment ratio, will be affected. The effective area section in the mixing tube is obtained. The effective area section position moves downstream with the increase of the primary flow pressure, while it moves upstream with the increase of the secondary flow pressure. The entrainment ratio shows inversely proportional relationship with the effective section position. Besides, the first shock train length increases with the increase of primary flow pressure or secondary flow pressure. The critical back pressure represents direct proportional relationship to the first shock train length.

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GB/T 7714 Chen, Weixiong , Xue, Kangkang , Chen, Huiqiang et al. Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes [C] . 2018 : 700-710 .
MLA Chen, Weixiong et al. "Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes" . (2018) : 700-710 .
APA Chen, Weixiong , Xue, Kangkang , Chen, Huiqiang , Chong, Daotong , Yan, Junjie . Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes . (2018) : 700-710 .
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Experimental investigation on the phenomenon of steam condensation induced water hammer in a horizontal pipe EI SCIE Scopus
期刊论文 | 2018 , 91 , 451-458 | EXPERIMENTAL THERMAL AND FLUID SCIENCE
WoS CC Cited Count: 4 SCOPUS Cited Count: 5
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Abstract :

The condensation induced water hammer (CIWH) phenomenon may cause serious damage to the pipes and related system, which often occurs during the steam-water direct contact condensation process. In this paper, an experimental investigation was performed to study CIWH phenomenon caused by steam-water direct contact condensation in a horizontal pipe. The entire CIWH process was captured by a high speed video camera and its pressure fluctuation was synchronously measured. Four typical flow patterns were observed during CIWH process: stratification flow, wave flow, slug flow and bubble collapse. Bubble collapse would generate a high pressure peak. Based on different variations of steam-water phase interface and pressure fluctuation signals, three types of CIWH were defined: non-periodic CIWH, periodic CIWH and no CIWH. A CIWH region map was given considering the effect of steam mass flux and water temperature. In periodic CIWH region, the generation frequency of CIWH was found to range from 0.19 Hz to 0.39 Hz, which decreased with the rise of steam mass flux and water temperature. A dimensionless correlation was obtained to predict Strouhal number of CIWH generation frequency. Predicted values corresponded well to the experimental data with the deviation in the range of -16% to +23%.

Keyword :

Generation frequency CIWH Horizontal pipe Region map Dimensionless correlation

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GB/T 7714 Wang, Lutao , Yue, Xiaoyu , Chong, Daotong et al. Experimental investigation on the phenomenon of steam condensation induced water hammer in a horizontal pipe [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 : 451-458 .
MLA Wang, Lutao et al. "Experimental investigation on the phenomenon of steam condensation induced water hammer in a horizontal pipe" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 91 (2018) : 451-458 .
APA Wang, Lutao , Yue, Xiaoyu , Chong, Daotong , Chen, Weixiong , Yan, Junjie . Experimental investigation on the phenomenon of steam condensation induced water hammer in a horizontal pipe . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 , 451-458 .
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Thermo-economic analyses on a new conceptual system of waste heat recovery integrated with an S-CO2 cycle for coal-fired power plants EI SCIE Scopus
期刊论文 | 2018 , 161 , 243-253 | ENERGY CONVERSION AND MANAGEMENT
WoS CC Cited Count: 7 SCOPUS Cited Count: 11
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Abstract :

Waste heat recovery from boiler exhaust flue-gas is an effective way to save energy in coal-fired power plants. The integration of a low-pressure economizer (LPE) is a conventional choice for waste heat recovery. In this study, thermodynamic analyses of a coal-fired power plant (CFPP) integrated with an LPE is conducted on a 600 MW CFPP as reference case. Standard coal consumption rate (SCCR) of the power plant could be decreased by 1.76 g.(kW h)(-1) by the LPE. Exergetic analysis reveals that significant irreversibility is exhibited by the air pre-heater (APH) of the waste heat recovery system with an LPE. Guided by the exergetic analysis of the conventional waste heat recovery system, a new conceptual system for waste heat recovery integrated with an S-CO2 cycle for CFPPs is designed in this study. In this novel system, the boiler flue-gas is split into two flows: one to heat air in APH, and another to drive an S-CO2 power cycle as the heat source. Parameters of the S-CO2 power cycle are thermodynamically optimized with the help of Genetic Algorithm. Optimal initial pressure and pressure ratio are 9.136 MPa and 5.84, respectively. Maximum cycle efficiency of the S-CO2 power cycle is 17.39%. With the optimal parameters, SCCR of the CFPP integrated with the S-CO2 power cycle decreases by 3.80 g.(kW h)(-1). If the LPE is further integrated, the reduction of SCCR can reach 5.19 g.(kW h)-1. The essential reason for the significant energy saving is revealed through exergetic analysis. Exergy losses and destructions also decrease significantly in the novel waste heat recovery system. Finally, the economic performance of the proposed system is evaluated. Results show that the novel waste heat recovery system is economically suitable, and that capital investment could be recycled in 3.067 years.

Keyword :

Coal-fired power plant Thermo-economic analyses S-CO2 power cycle Waste heat recovery

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GB/T 7714 Liu, Ming , Zhang, Xuwei , Ma, Yuegeng et al. Thermo-economic analyses on a new conceptual system of waste heat recovery integrated with an S-CO2 cycle for coal-fired power plants [J]. | ENERGY CONVERSION AND MANAGEMENT , 2018 , 161 : 243-253 .
MLA Liu, Ming et al. "Thermo-economic analyses on a new conceptual system of waste heat recovery integrated with an S-CO2 cycle for coal-fired power plants" . | ENERGY CONVERSION AND MANAGEMENT 161 (2018) : 243-253 .
APA Liu, Ming , Zhang, Xuwei , Ma, Yuegeng , Yan, Junjie . Thermo-economic analyses on a new conceptual system of waste heat recovery integrated with an S-CO2 cycle for coal-fired power plants . | ENERGY CONVERSION AND MANAGEMENT , 2018 , 161 , 243-253 .
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Optimizing thermal conductivity distribution for heat conduction problems with different optimization objectives EI SCIE Scopus
期刊论文 | 2018 , 119 , 343-354 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

In this paper the optimization of the thermal conductivity distribution for heat conduction enhancement is discussed. Different optimization objectives are considered which include the conductivity weighted quadratic temperature gradient and the weighted average temperature in the whole region or on the heat flux boundary. The adjoint state equations and gradient relations for the optimizations are obtained by the variational method and the 1D and 2D optimization problems are solved to demonstrate the analyses. The analyses show that different objectives are not generally equivalent to each other. When all the temperature boundaries have a same constant temperature, the optimization of the conductivity weighted quadratic temperature gradient has the following equivalences: 1) it is equivalent to the constant temperature gradient relation; 2) it is equivalent to the optimization of heat source averaged temperature in the domain when the heat flux boundaries are adiabatic; 3) it is equivalent to the heat flux averaged temperature on the heat flux boundary when the heat source intensity is zero. Otherwise, the configurations of the optimized temperature and thermal conductivity distributions for different objectives can have large differences. Therefore, the objectives should be carefully chosen when dealing with the heat conduction optimizations. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Average temperature Thermal conductivity distribution Heat conduction Optimization Variational method Quadratic temperature gradient

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GB/T 7714 Tong, Zi-Xiang , Li, Ming-Jia , Yan, Jun-Jie et al. Optimizing thermal conductivity distribution for heat conduction problems with different optimization objectives [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 119 : 343-354 .
MLA Tong, Zi-Xiang et al. "Optimizing thermal conductivity distribution for heat conduction problems with different optimization objectives" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 119 (2018) : 343-354 .
APA Tong, Zi-Xiang , Li, Ming-Jia , Yan, Jun-Jie , Tao, Wen-Quan . Optimizing thermal conductivity distribution for heat conduction problems with different optimization objectives . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 119 , 343-354 .
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Exergy analysis of centered water nozzle steam-water injector EI SCIE Scopus
期刊论文 | 2018 , 94 , 77-88 | EXPERIMENTAL THERMAL AND FLUID SCIENCE
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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A steam-water injector (SI), which is a passive jet pump, has been widely used in various industries. In the present work, exergy analysis models of a centered water nozzle SI were developed based on experiments to evaluate the performance of SI. The thermodynamic perfect degree of SI was found to be not so bad, and exergy efficiency was within the range of 18%-45%. In general, SI is used to work as a pump. However, exergy analysis can only evaluate the thermodynamic perfect degree of SI, but cannot evaluate its lifting-pressure performance. Therefore, thermo-mechanical exergy was divided into temperature-based exergy and pressure-based exergy in the present work, and the pressure-based exergy analysis was introduced. Such analysis was determined to be more reasonable than exergy analysis for a passive jet pump and helpful for achieving optimal SI design. Moreover, the effects of physical and geometric parameters on exergy efficiency and pressure-based exergy efficiency were investigated experimentally, and several optimal values for these geometric parameters were found. Finally, the distributions of exergy losses in separate parts of SI, particularly inevitable exergy losses, were evaluated. These analyses will be helpful in eliminating the effects of inevitable factors and in identifying the key factor, thereby considerably improving SI performance.

Keyword :

Pressure-based exergy analysis Inevitable exergy losses Steam-water injector Exergy analysis

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GB/T 7714 Li, Wenjun , Liu, Ming , Yan, Junjie et al. Exergy analysis of centered water nozzle steam-water injector [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 94 : 77-88 .
MLA Li, Wenjun et al. "Exergy analysis of centered water nozzle steam-water injector" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 94 (2018) : 77-88 .
APA Li, Wenjun , Liu, Ming , Yan, Junjie , Wang, Jinshi , Chong, Daotong . Exergy analysis of centered water nozzle steam-water injector . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 94 , 77-88 .
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