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The 7th Sino-US Conference of Chemical engineering(第7届中美化学工程会议)

作者： Yongchao Li Xiaoming Wu Huan Wang Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi''an Jiaotong UniversityXi''an 710049China

In present work,the gas-solid two-phase flow in a flat-bottom multiple-spouted bed is simulated by the Eulerian-Eulerian *** kinetic theory of granular flow is used to close the equations,and the Johnson & Jac... 详细信息

关键词： multiple-spouted bed flat-bottom hydrodynamics simulation voidage two-fluid model KTGF theory

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Numerical modeling of tissue freeze during cryogen spray cooling with R134a, R407c and R404a

Numerical modeling of tissue freeze during cryogen spray coo...

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2nd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control(IWHT2013)(2013年第二届节能减排传热进展国际研讨会)

作者： Dong Li G-X Wang Bin Chen Ya-Ling He Department of Mechanical Engineering The University of Akron Akron Ohio 44325-3903 USA State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an Shaanxi 710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an Shaanxi 710049 China

In laser dermatologic surgery, cryogen spray cooling (CSC) is used to avoid unwanted damage such as scars from skin burning due to the melanin absorption of the laser beam.R134a, R407c and R404a are all considered non... 详细信息

关键词： cryogen spray cooling cryogen types micro-scale heat and mass transfer cold injury

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Investigation on deflagration behaviors of oil and natural gas boiler and analysis of deflagration prevention

Investigation on deflagration behaviors of oil and natural g...

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International Conference on Power engineering 2013, ICOPE 2013

作者： Li, Lian Li, Hui Li, Na Zhou, Qulan Shen, Jizhao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China China Nuclear Power Design Co. Ltd. Shenzhen518057 China Yangzhou Chenguang Special Equipment Co. Ltd. Yangzhou225800 China

For the investigation on deflagration of oil/natural gas boiler and its prevention, an experimental system was designed and built to measure deflagration characteristics of combustible gas. The explosion limits of methane and its mixture of CO were measured at different temperature. The results matched the theoretical values well. It was also found that the range of explosion limit widens with an increase of initial temperature or a rise of CO rate, which indicates that incompletely burned methane causes high risk of deflagration. The possibility of deflagration, which may happen during purging, was numerically analyzed. Igniting without purging after flameout increases the possibility of deflagration. The result of unsteady numerical modeling on purging shows that ignition should be done rapidly within 5 minutes and purging is necessary before sparking again. The amount of purging air to ensure safety is 4 times of the furnace volume.

关键词： Purging

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A 1D model to predict ejector performance at critical and sub-critical operational regimes

A 1D model to predict ejector performance at critical and su...

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作者： Chen, Weixiong Liu, Ming Chong, Daotong Yan, Junjie Little, Adrienne Blair Bartosiewicz, Yann State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China Place du Levant 2 B-1348 Louvain-la-Neuve Belgium George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332-0405 United States

This paper proposes a new 1D model to predict ejector performance at critical and sub-critical operational modes, while most previous 1D models have only predicted ejector performance at critical mode operation. Constant pressure mixing is assumed to occur inside the constant area section of the ejector at critical and sub-critical mode operation, and the effectiveness of the model is verified against four sets of experimental data that include different working fluids and geometries. The results show that the proposed model accurately predicts ejector performance over all ranges of operation, and is a useful tool for predicting ejector performance within larger refrigeration cycle models. © 2013 Elsevier Ltd and IIR. All rights reserved.

关键词： Forecasting

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Discrete particle simulation of mixed sand transport

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Particuology 2012年第2期10卷 221-228页

作者： Fengjiun Xiao Lieiin Guo Debiao Li Yueshe Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

An Eulerian/Lagrangian numerical simulation is performed on mixed sand transport. Volume averaged Navier-Stokes equations are solved to calculate gas motion, and particle motion is calculated using Newton＇s equation, involving a hard sphere model to describe particle-to-particle and particle-to-wall collisions. The influence of wall characteristics, size distribution of sand particles and boundary layer depth on vertical distribution of sand mass flux and particle mean horizontal velocity is analyzed, suggesting that all these three factors affect sand transport at different levels. In all cases, for small size groups, sand mass flux first increases with height and then decreases while for large size groups, it decreases exponen- tially with height and for middle size groups the behavior is in-between. The mean horizontal velocity for all size groups well fits experimental data, that is, increasing logarithmically with height in the middle height region. Wall characteristics greatly affects particle to wall collision and makes the fiat bed similar to a Gobi surface and the rough bed similar to a sandy surface. Particle size distribution largely affects the sand mass flux and the highest heights they can reach especially for larger particles.

关键词： Mixed sand transportHard sphere modelSand mass fluxParticle horizontal mean velocity

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Applications of laser diagnostics to engines and thermal power plants

Applications of laser diagnostics to engines and thermal pow...

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2nd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control(IWHT2013)(2013年第二届节能减排传热进展国际研讨会)

作者： Yoshihiro Deguchi Takahiro Kamimoto Zhenzhen Wang Junjie.Yan Jiping Liu State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an China State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an China Graduate School of Advanced Technology and Science The University of Tokushima Tokushima Japan Graduate School of Advanced Technology and Science The University of Tokushima Tokushima Japan

It has been a major challenge to reduce anthropogenic carbon dioxide emissions in *** the trend is the fact that increased carbon dioxide in the air causes global warming and adversely affects natural *** demands for ... 详细信息

关键词： Temperature and concentration measurement CT-tunable diode laser absorption spectroscopy Laser induced breakdown spectroscopy Time-of-flight mass spectrometry Engine Thermal power plant

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Effect of tube diameters on Marangoni condensation heat transfer for ethanol-water mixture vapors

Effect of tube diameters on Marangoni condensation heat tran...

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2nd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control(IWHT2013)(2013年第二届节能减排传热进展国际研讨会)

作者： J.S.Wang J.J Yan X.P.Chen D.T.Chong J.P.Liu State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an 710049 China Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi''an Jiaotong University Xi''an 710049 China

Marangoni condensation attracts much attention in recent years, due to the high heat transfer coefficient and pseudo-dropwise condensation mode which could be maintained for a long *** present study focused on the effect of tube diameters on Marangoni condensation heat transfer in the case of ethanol-water mixture vapors condensation.

关键词： Marangoni condensation tube diameter ethanol-water mixture heat transfer coefficient

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Enhanced Boiling Heat Transfer of FC-72 over Micro-Pin-Finned Surfaces with Submerged Jet Impingement

Enhanced Boiling Heat Transfer of FC-72 over Micro-Pin-Finne...

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2nd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control(IWHT2013)(2013年第二届节能减排传热进展国际研讨会)

作者： Y.H.Zhang J.J.Wei X.Kong State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi''an Jiaotong University Xi''an Shaanxi 710049 P.R.China

The experiment was made of boiling heat transfer of FC-72 on micro-pin-finned chips with submerged jet *** experimental conditions cover two different liquid subcooling degrees (25, 35 K), three different jet velociti... 详细信息

关键词： Micro-pin-fins jet impingement Enhancement FC-72 boiling

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Recovery of waste heat in cement plants for the capture of CO2

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Frontiers of Chemical Science and engineering 2012年第1期6卷 104-111页

作者： Ruifeng DONG Zaoxiao ZHANG Hongfang LU Yunsong YU State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

Large amounts of energy are consumed during the manufacturing of cement especially during the calcination process which also emits large amounts of CO2. A large part of the energy used in the making of cement is released as waste heat. A process to capture CO2 by integrating the recovery and utilization of waste heat has been designed. Aspen Plus software was used to calculate the amount of waste heat and the efficiency of energy utilization. The data used in this study was based on a dry process cement plant with a 5-stage preheater and a precalciner with a cement output of 1 Mt/y. According to the calculations： 1） the generating capacity of the waste heat recovery system is 4.9MW. 2） The overall CO2 removal rate was as high as 78.5%. 3） The efficiency of energy utilization increased after the cement producing process was retrofitted with this integrated design.

关键词： cement industry waste heat recovery utiliza-tion CO2 removal

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Theoretical research on heating the feedwater of thermal power units using jet heat pump

Theoretical research on heating the feedwater of thermal pow...

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2nd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control(IWHT2013)(2013年第二届节能减排传热进展国际研讨会)

作者： Wei Han Guangyao Liu Jiping Liu Daotong Chong Jinshi Wang Junjie Yan Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi''an Jiaotong University Xi''an China China HuaDian Electric Research Institute Hangzhou 310030 Hangzhou China State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an China

The feedwater temperature of thermal power unit always decreases with the electrical *** order to solve this problem, the ejector heat pump is integrated with the regenerative *** live steam is used to inject the extraction steam of regenerative system, then the mixture steam is led to the added heater (working in low load condition, named as low load condition heater bellow) to heat the feedwater.

关键词： Feedwater Jet heat pump Low load

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