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Experimental studies on the enhanced flow boiling heat transfer and pressure drop of organic fluid with high saturation temperature in vertical porous coated tube

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AIP Conference Proceedings 2013年第1期1547卷 442-453页

作者： Dong Yang Zhi Shen Tingkuan Chen Chenn Q. Zhou State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 Xi'an China Department of Mechanical Engineering Purdue University Calumet Hammond IN 46323 USA

The characteristics of flow boiling heat transfer and pressure drop of organic fluid with high saturation temperature in a vertical porous coated tube are experimentally studied in this paper. The experiments are performed at evaporation pressure of 0.16-0.31MPa, mass flux of 390-790kg/m2s, and vapor quality of 0.06-0.58. The variations of heat transfer coefficient and pressure drop with vapor quality are measured and compared to the results of smooth tube. Boiling curves are generated at mass flux of 482 and 675kg/m2s. The experimental results indicate that the heat transfer coefficients of the porous tube are 1.8-3.5 times those of smooth tube, and that the frictional pressure drops of the porous tube are 1.1-2.9 times those of smooth tube. The correlations for heat transfer coefficient and frictional pressure drop are derived, in which the effect of fluid molecular weight is included. The experiments show that significant heat transfer enhancement is accompanied by a little pressure drop penalty, the application of the porous coated tube is promising in the process industries.

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Numerical simulation on inertia controlled steam bubble condensation using MPS

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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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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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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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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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