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Numerical simulation on inertia controlled steam bubble condensation using MPS

AIP Conference Proceedings 2013年第1期1547卷 614-623页

作者： Daotong Chong Yuki Ishiwatari Yoshiaki Oka Junjie Yan Jiping Liu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 Xi'an and Department of Nuclear Engineering &Management University of Tokyo Hongo Tokyo Japan Department of Nuclear Engineering &Management University of Tokyo Hongo Tokyo Japan Department of Nuclear Engineering Waseda University Okubo Tokyo Japan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 Xi'an China

Bubble dynamics is quite complicated in the field of two-phase hydrodynamics because the interfacial heat and mass transfer is comprehensively affected by various influencing factors. Bubble condensation can be either thermally controlled or inertia controlled. Inertia controlled bubble condensation indicates that considerable pressure difference exists between the steam bubble and ambient liquid. In this paper, the inertia controlled steam bubble condensation was simulated using moving particle semi-implicit (MPS) method. The spherical bubble is located in the center of the cylindrical pool which makes the possibility of 2-D axisymmetric computation. The lateral and bottom wall are set to be rigid insulated boundaries and the top is free surface boundary. The pool volume must be large enough to eliminate the effects by pool wall. The initial bubble pressure ranges from 0.48 MPa to 3.98 MPa, and the initial bubble diameter ranges from 2 mm to 5 mm, and the ambient water pressure and temperature is 0.1 MPa and 70 °C, respectively. The bubble dynamics during condensation was investigated and the influences of initial bubble pressure and diameter were obtained. The bubble deformation during condensation is shown in figure 1, and the variations of bubble diameters and pressures during condensation are shown in figures 2 and 3, respectively.

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Theoretical analysis of the characteristics of the solid oxide fuel cells with a bi-layer electrolyte

Theoretical analysis of the characteristics of the solid oxi...

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作者： Shen, Shuanglin Guo, Liejin Liu, Hongtan International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an Shaanxi 710049 China Clean Energy Research Institute Department of Mechanical and Aerospace Engineering University of Miami Coral Gables FL 33124 United States

From the analytical model derived earlier [17], analytical expressions for the relative thickness ratio rs of a bi-layer electrolyte and the maximum power density of a fuel cell are developed. Using these expressions, together with the other relationships from the analytical model, the characteristics of solid oxide fuel cells (SOFCs) with a bi-layer electrolyte are analyzed and theoretical analysis of the effect of the configuration of a bi-layer electrolyte on the SOFC performance is performed. The results show that the effectiveness of the bi-layer electrolyte depends strongly on its configuration. In the analyses, the variations of open circuit voltage and the maximum power density with the thickness ratio at different total electrolyte thicknesses and different operating temperatures are obtained. Furthermore, by taking into considerations of the oxygen partial pressure at the interface between the two layers of electrolytes, an analytical expression for the critical relative thickness ratio, above which, the electrolyte is stable, is obtained. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Open circuit voltage

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Calculation of the Critical Speed and Stability Analysis of Cryogenic Turboexpanders with Different Structures

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Plasma Science and Technology 2012年第10期14卷 919-926页

作者：陈双涛赵红利马斌侯予 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

A modularized code based on the Finite Element QZ （FEQZ） method is developed, for a better estimate of the critical speed and a more convenient method of rotor-dynamic stability analysis for a gas bearing high speed turboexpander rotor system with actual structure and application of a cryogenic turboexpander. This code is then validated by the experimental data of a gas bearing turboexpander, with a rotor diameter of 25 mm and a rated speed of 106,400 rpm. With this code, four rotors with different structures, available to the turboexpander, are parametrically analyzed by the available speed range, vibration modes and logarithmic attenuation rate. The results suggest that the rotor with a structure of two thrust collars on the system exhibits a better performance in the designed conditions.

关键词： critical speed gas bearing cryogenic turboexpander

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Simulation of hemodynamics in portal vein hypertension using CFD

Simulation of hemodynamics in portal vein hypertension using...

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第五届中美生物医学工程暨海内外生物力学学术研讨会

作者： Xiao Li Yansong Pu Peng Nie Zongfang Li Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering.Xi'an Jiaotong University Second Affiliated Hospital.Xi'an Jiaotong University Department of Radiology Huaihe Hospital of Henan University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

＜正＞Introduction Liver cirrhosis generally occurs with the hemodynamic changes during the portal vein hypertension and finally leads to the atrophy of the right lobe of the liver and hepatic *** to the hemodynamic changes,a hypothesis has been proposed that the liver volume is related to the istribution of blood from the splenic vein（SV） that involves nutrition from spleen and pancreas The objective of the present paper is to simulate the blood flow in real models of portal vein hypertension and validate the hypothesis using computational fluid dynamics （CFD） method.

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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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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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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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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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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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