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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...

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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Performance analysis of conventional and sloped solar chimney power plants in China

Performance analysis of conventional and sloped solar chimne...

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作者： Cao, Fei Zhao, Liang Li, Huashan Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University No. 28 West Xianning Rd Xi'an 710049 China Key Laboratory of Renewable Energy and Gas Hydrate Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou China Graduate University Chinese Academy of Sciences Beijing 100049 China

The solar chimney power plant (SCPP) has been accepted as one of the most promising approaches for future large-scale solar energy applications. This paper reports on a heat transfer model that is used to compare the performance of a conventional solar chimney power plant (CSCPP) and two sloped solar chimney power plants (SSCPPs) with the collector oriented at 30° and 60°, respectively. The power generation from SCPPs at different latitudes in China is also analyzed. Results indicate that the larger solar collector angle leads to improved performance in winter but results in lower performance in summer. It is found that the optimal collector angle to achieve the maximum power in Lanzhou, China, is around 60°. Main factors that influence the performance of SCPPs also include the system height and the air thermophysical characteristics. The ground energy loss, reflected solar radiation, and kinetic loss at the chimney outlet are the main energy losses in SCPPs. The studies also show SSCPPs are more suitable for high latitude regions in Northwest China, but CSCPPs are suggested to be built in southeastern and eastern parts of China with the combination to the local agriculture. © 2012 Elsevier Ltd. All rights reserved.

关键词： Solar chimneys

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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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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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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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Pool Boiling Heat Transfer on Ultra-light Porous Metal Foam Surfaces

Pool Boiling Heat Transfer on Ultra-light Porous Metal Foam ...

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2013 International Conference on Materials for Renewable Energy and Environment

作者： Xianbing Ji Qiang Xue Jiliang Xu Jia Xu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University The Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power University

ISBN: (纸本)9781479933372

Experiments were conducted to study pool boiling heat transfer on ultra-light porous metal foam surfaces,with deionized water as working *** metal foams have pore densities from 30 to 60ppi(pores per inch) and thickness from2.0 to *** effects of heat flux,surface superheat,liquid temperature and characteristic parameters of metal foam on pool boiling heat transfer were *** is found that metal foam surfaces can significantly enhance pool boiling heat transfer and lower the surface superheat at the boiling *** density and thickness exists an optimal value to strengthen boiling heat *** boiling heat transfer coefficient on the metal foam surfaces is about 2～3 times of those on the plain *** significant reasons are due to the distinct nature of high porosity and multi-scale pore sizes of metal *** larger pores help to release the created vapor while the smaller pores help to suck the liquid toward the heater surface,decreasing the shear stress at the vaporliquid interface for the counter-current flow.

关键词： pool boiling heat transfer porous metal foam

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CO2 Splitting by Solar Two-Step Thermochemical Cycles with Cr, Ni and Li Doped CeO2 Solid Solution

CO2 Splitting by Solar Two-Step Thermochemical Cycles with C...

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IUPAC 9th International Conference on Novel Materials and their Synthesis(NMS-IX) & 23rd International Symposium on Fine Chemistry and Functional Polymers(FCFP-XXIII)(IUPAC第九届新型材料和合成国际会议暨第23届国际精细化工和功能聚合物研讨会)

作者： Y.J.Lu State Key Lab.of Multiphase Flow in Power Engineering Xi''an Jiaotong University28 Xianning West Road Xi''an 710049 China

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