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Rapid calculation for density of water and steam on p-T thermodynamic surface

Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and engineering 2012年第SUPPL.期20卷 190-198页

作者： An, Bin Wang, Xiaodong Duan, Yuanyuan Wang, Zhixue State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy North China Electric Power University Beijing 102206 China Key Laboratory for Thermal Science and Power Engineering of MOE Department of Thermal Engineering Tsinghua University Beijing 100084 China

This paper develops a rapid calculation method for thermodynamic properties of water and steam on p-T thermodynamic surface with 273.16K

关键词： Steam

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Kinetic study of the isomerization for endo-tetrahydrodicyclopentadiene over AlCl3 catalyst

Kinetic study of the isomerization for endo-tetrahydrodicycl...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Hao, Miaoli Wu, Weitao Qi, Suitao Yang, Bolun Yang, Jianming Zhang, Wei Lv, Jian Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Xi'an Modern Chemistry Research Institute Xi'an China

ISBN: (纸本)9781424494392

The isomerization of endo-tetrahydrodicyclopentadiene (THDCPD) to exo-THDCPD over AlCl3 catalyst has been studied in a batch reactor. The effects of temperature, catalyst loading, and the type and amount of solvent on the isomerization rate were investigated. Under the conditions of removing both internal and external diffusion effects, a kinetic model was established and the model parameters were developed. The results showed that the endo- to exo- isomerization of THDCPD can be treated as a first-order reaction. The activation energy E0 and pre-exponential factor obtained from Arrhenius plot are 116 kJ /mol and 3.39×1013 respectively. The simulation results agreed well with the experimental data. © 2011 IEEE.

关键词： Isomerization

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Study of the effective influence distance of longitudinal vortex in narrow rectangular channel

Study of the effective influence distance of longitudinal vo...

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International Conference on Computer Distributed Control and Intelligent Environmental Monitoring

作者： Huang, Jun Huang, Yan-Ping Ma, Jian Wang, Qiu-Wang Key Laboratory of Bubble Physics and Natural Circulation Nuclear Power Institute of China Chengdu China China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an China

ISBN: (纸本)9780769543505

The heat transfer enhancement of Longitudinal Vortex (LV) is a kind of technology with efficiency is high and resistance is low. The effective influence distance of LV is very important to extend this kind of technology in narrow rectangular channels under water medium. CFX10.0 is used to simulate this question, and three velocity components of water flow have been used to define the strength of LV. The results of this calculate method are compared with the experimental results of thermal infrared imager and phase doppler particle analyzer, and they are reasonable. In this paper range, the effective influence distance of LV is bigger than 33 times of Longitudinal Vortex Generators (LVGs) height. © 2011 IEEE.

关键词： flow of water

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MPS simulation of primary thrombus formation in capillary

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2011年第2期32卷 227-229页

作者： Rong, Shao-Shan Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The adhesion, activation and aggregation of platelets play an important role in the primary thrombus formation. In present paper, platelets, plasma, normal and injured endodermis of the vessel are modeled as particles with different characteristics and simulated by the Moving Particle Semi-implicit (MPS) method. In order to simulate the aggregation and adhesion of platelets on the injured endodermis of the vessel, a mechanical adhesion force model is introduced according to the inter-molecular force and physiological interaction between platelets and endodermis is modeled by the stretch and rotation of a spring. By this method, the formation of primary thrombus at the injured endodermis of horizontal and bending vessel is numerically reproduced. Results show that the thrombus forms quickly and the number of adhered platelets will not increase if thrombus has been formed. Through the analysis of flow field, the platelets go through the vibration, steady and potential break free process. Compared with horizontal vessel, the thrombus formation at the bending vessel is slower.

关键词： Platelets

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Performance comparison and analysis of typical energy conversion cycle

Performance comparison and analysis of typical energy conver...

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International Conference on Computer Distributed Control and Intelligent Environmental Monitoring

作者： Wang, Yuqi Zheng, Lan Yang, Fusheng Meng, Xiangyu Zhang, Zaoxiao School of Chemical Engineering Northwest University Xi'an Shaanxi 710069 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an Shaanxi 710049 China

ISBN: (纸本)9780769543505

The performance of 3 types of energy utilization cycles including the organic Rankine cycle, the single stage static hydrogen compression cycle, and the new multistage continuous hydrogen compression cycle were analyzed. A multi-element valued model was used to evaluate the performance holistically, and the result showed that the integrated superiority achieved 0.721, which indicated the continuous hydrogen compression cycle is considered the best option among the typical compression energy utilization cycles and deserves thorough studying. © 2011 IEEE.

关键词： Energy utilization

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Radiant performance of opacifiers in opcifier-loaded silica aerogel-based composites

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Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and engineering 2012年第SUPPL.期20卷 181-189页

作者： Sun, Duo Wang, Xiaodong Duan, Yuanyuan Zhao, Junjie State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Department of Thermal Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy North China Electric Power University Beijing 102206 China Key Laboratory for Thermal Science and Power Engineering of MOE Department of Thermal Engineering Tsinghua University Beijing 100084 China

Since the opacifier-loaded silica aerogel composites have strong ability to inhibit radiant heat transfer compared to the pure silica aerogel, they can improve effectively the insulation performance at high temperature conditions and have been used extensively as thermal insulation materials in a variety of industrial applications. This paper developed a theoretical model to predict the radiant performance of opacifiers by using the Mie scattering theory, Beer law and a radiant heat transfer equations. The model was used to calculate the radiant performance of carbon black opacifier with various particle diameters and the radiant performance of three opacifiers, carbon black, SiC and ZrO2. The results showed that the opacifier-loaded silica aerogel composites had much higher extinction coefficient than the pure silica aerogel in a range of 3-7.5 μm wave band or in medium and high temperature ranges, which significantly improved the insulation performance of composites. With a fixed opacifier mass fraction, the optimal particle diameter was 2-3 μm for carbon black opacifier. Among the three opacifiers, carbon black opacifier had better opaque property than that of SiC and ZrO2 opacifiers. Due to poor thermostability for carbon black opacifier at high temperature conditions, the optimal material design for opacifier-loaded silica aerogel composites should be as follows: SiC or ZrO2 are added on high temperature side of aerogel and carbon black is added on low temperature side.

关键词： Thermal conductivity

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Anomalous enhancement in thermal conductivity of nanofluid induced by solid walls in a nanochannel

Anomalous enhancement in thermal conductivity of nanofluid i...

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作者： Sun, Chengzhen Lu, Wen-Qiang Bai, Bofeng Liu, Jie State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China College of Physical Sciences Graduate University Chinese Academy of Sciences Beijing 100049 China

Thermal conductivity of Ar-Cu nanofluid confined between two parallel walls (in a nanochannel) is calculated by equilibrium-molecular-dynamics (EMD) simulation through Green-Kubo formula. The results show that the vibration of nanoparticle in the channel height direction (z-direction) is inhibited due to the presence of solid boundaries and accordingly the thermal conductivity of the confined nanofluid is obviously anisotropic. Anomalous enhancement in the thermal conductivity perpendicular to the z-direction (λ) appears as a result of the strong coupling interactions between the fluid atoms, especially the nanoparticle atoms, and the wall atoms. The thermal conductivity λ of the nanofluid confined in the channel of width h = 5.148 nm increases with the increase of the nanoparticle diameter for the strengthened couplings. The nanoparticle volume fraction effect on the thermal conductivity of the confined nanofluid is more obvious than that in macroscale. In addition, the thermal conductivity λ of the nanofluid with diameter of nanoparticle d = 1.370 nm decreases with the channel width increasing owing to the weakened couplings resulted by a longer interacting distance. © 2011 Elsevier Ltd. All rights reserved.

关键词： Molecular dynamics

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Surface modification of α-Fe2O3 nanorod array photoanodes for improved light-induced water splitting

Surface modification of α-Fe2O3 nanorod array photoanodes f...

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2011 MRS Spring Meeting

作者： Shen, Shaohua Kronawitter, Coleman X. Jiang, Jiangang Guo, Liejin Mao, Samuel S. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China Environmental Energy Technologies Division Lawrence Berkeley National Laboratory Berkeley CA 94720 United States

ISBN: (纸本)9781618395238

α-Fe2O3 nanorod arrays were fabricated by a low-temperature aqueous chemical growth (ACG) technique and followed by an annealing process. For the surface doping of α-Fe2O3 nanorods, β-FeOOH nanorods obtained via ACG were coated with a thin layer of Cr3+ precursor solution by spin coating, and then underwent the annealing treatment in air. Conducting polymer polypyrrole (PPy) decorated α-Fe2O3 nanorods were prepared by electrodeposition method using malic acid contained pyrrole aqueous solution. Primary results showed that the photocurrents of α-Fe2O3 nanorod array photoanodes were greatly enhanced by surface doping of Cr3+, as well as PPy decoration. This might be due to the retarded charge recombination and promoted surface reaction rate of photogenerated holes with water. Further investigation on surface modification of α-Fe2O3 nanorod array photoanodes is currently conducted in our group. © 2011 Materials Research Society.

关键词： Nanorods

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Study on the Radiation Distribution in A Fluidized Tubular Reactor for Heterogeneous Photocatalytic Hydrogen Production

Study on the Radiation Distribution in A Fluidized Tubular R...

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2011 International Conference on Energy and Environment(ICEE 2011)

作者： Zhao Liang Fan Liangliang Jing Dengwei Liu Wenxu Cao Fei Zhu Xule Yang Junyin Zhang Hailong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Radiation distribution study is of importance for the design and the optimization of fluidized photocatalytic tubular reactor which has been developed for photocatalytic hydrogen production under direct solar light. In the present study, the radiation distribution in such reactor was successfully simulated by adopting Monte Carlo method and the six-flux radiation absorption-scattering models. Both the incident angles of light around the reactor and the concentration distribution of photocatalyst were taken into account. Our analysis indicates that the angles and the intensity of the incident rays significantly affect the radiation distribution. Moreover, it was also found that the equilibrium radiation distribution has a close relationship with the density distribution of the photocatalysts. The simulated results are expected to be helpful for obtaining the optimal operating parameters for solar photocatalytic hydrogen production.

关键词： radiation distribution,fluidized tubular reactor,nanometer catalyst,compound parabolic concentrators

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A Model for Wave Properties in Churn flow

A Model for Wave Properties in Churn Flow

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The Fifth China-Korea Workshop on Nuclear Reactor Thermal Hydraulics

作者： Ke Wang Bofeng Bai Jiahuan Cui State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

A model for wave properties, such as wave velocity and amplitude in churn flow has been developed in this paper. The results demonstrate that the wave behavior differs from that in annular flow. In addition, the critical amplitude A c decreases with the increase in gas flow rate. Moreover, the maximum amplitude A max decreases with the increasing of gas mass flux but increase with the increasing of liquid mass flux. The average absolute deviations (AAD) for A c and A max are 16.29% and 7.10%, respectively.

关键词： A Model for Wave Properties in Churn flow Model

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