检索结果-内蒙古大学图书馆

A finite volume solver for Casson fluid flow by SIMPLE algorithm on unstructured grid

Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2010年第7期31卷 1163-1166页

作者： Zhou, Gao-Ling Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

A finite volume solver for Casson fluid flow based on SIMPLE algorithm of Newtonian fluid on unstructured collocated grid is developed to simulate haemodynamics in complex vessel. The discretization of convective flux and source term are similar with Newtonian fluid. For the discretization of diffusion flux, viscosity will take the value calculated from the flow field of previous iteration so as to avoid the complexity caused by the complicated viscosity expression as a function of shear rate. Then the discretization of momentum equation is similar with that of Newtonian fluid with variable viscosity and SIMPLE algorithm can be used to resolve the pressure-velocity coupling. With this algorithm, blood flows in a T-typed bifurcation are simulated. The simulation results of Casson fluid are more consistent with experimental data than that of Newtonian fluid, which indicates that using Casson model to simulate non-Newtonian characteristics of blood flow is successful and necessary.

关键词： Finite volume method

来源：评论

学校读者我要写书评

暂无评论

Study on characteristic points of boiling curve by using wavelet analysis and genetic algorithm

引用

Yuanzineng Kexue Jishu/Atomic Energy Science and Technology 2009年第5期43卷 421-425页

作者： Wei, Hui-Ming Su, Guang-Hui Qiu, Sui-Zheng Yang, Xing-Bo State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Based on the wavelet analysis theory of signal singularity detection, the critical heat flux (CHF) and minimum film boiling starting point (qmin) of boiling curves can be detected and analyzed by using the wavelet multi-resolution analysis. To predict the CHF in engineering, empirical relations were obtained based on genetic algorithm. The results of wavelet detection and genetic algorithm prediction are consistent with experimental data very well.

关键词： Wavelet analysis

来源：评论

学校读者我要写书评

暂无评论

PIV measurement of turbulent mixing layer

引用

Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2008年第11期29卷 1867-1871页

作者： Guo, Fu-De Chen, Bin Wang, Zhi-Wei Guo, Lie-Jin Zhang, Xi-Min State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

In present paper a turbulent mixing layer with the velocity ratio 4:1.which was produced by a special designed splitter plated placed in a vertical rectangular channel was experimentally investigated by PIV. The Reynolds number based on the velocity difference of two steams and hydraulic diameter of the channel ranges from 4400-1.8400. It is found that the scale of coherent vortex structure increases with increasing the Reynolds number and then decreases with continuously increasing the Reynolds number. The injected bubble will delay or hinder the evolution of the coherent structures. Afterwards the statistical and instantaneous distributions of Reynolds stress, turbulent intensity, vorticity and swirling strength are obtained. The results show that all these turbulent parameters exist only in a very narrow conical region in the downstream of the mixing layer. The Reynolds stress and turbulent intensity first increase and then decrease with increasing the Reynolds number and decrease with the evolution of mixing layer, while vorticity and swirling strength increase with increasing the Reynolds number and decrease with the evolution of mixing layer.

关键词： Reynolds number

来源：评论

学校读者我要写书评

暂无评论

Laser-induced breakdown spectroscopy in Asia

引用

Frontiers of physics 2016年第6期11卷 231-255页

作者： Zhen-ZhenWang Yoshihiro Deguchi Zhen-Zhen Zhang Zhe Wang Xiao-Yan Zeng Jun-Jie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Graduate School of Advanced Technology and Science Tokushima University Tokushima 770-8501 Japan State Key Lab of Power Systems Department of Thermal Engineering Tsinghua-BP Clean Energy Center Tsinghua University Beijing 100084 China Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology Wuhan ~3007~ China

Laser-induced breakdown spectroscopy (LIBS) is an analytical detection technique based on atomic emission spectroscopy to measure the elemental composition. LIBS has been extensively studied and developed due to the non-contact, fast response, high sensitivity, real-time and multi-elemental detection features. The development and applications of LIBS technique in Asia are summarized and discussed in this review paper. The researchers in Asia work on different aspects of the LIBS study in fundamentals, data processing and modeling, applications and instrumentations. According to the current research status, the challenges, opportunities and further development of LIBS technique in Asia are also evaluated to promote LIBS research and its applications.

关键词： laser-induced breakdown spectroscopy (LIBS) quantitative analysis signal enhancement applications challenges

来源：评论

学校读者我要写书评

暂无评论

Effects of surface wettability on boiling nucleation

引用

Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2016年第1期37卷 111-115页

作者： Zheng, Wen-Xiu Li, Si-Jie Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

We established a gas-liquid-solid three phase pool boiling system from molecular dynamics insight, introducing the interactions between the wall and the fluid as an additional force. The effects of wall wettability on the boiling nucleation were studied from three aspects of the nucleation position, the average kinetic energy and the interface contact thermal resistance. The results show that strong surface wettability means strong constraint to the near surface molecules and gas nuclear position is farther from the surface. For stronger surface wettability, the molecular average kinetic energy for the molecules adjacent to the surface is significantly larger than that for the molecules far from the surface, for weaker surface wettability, molecular kinetic energy has a uniform distribution in the vertical direction of the wall. As increasing the surface wettability the interface contact thermal resistance increases and accordingly the boiling nucleation is weakened. © 201., Science Press. All right reserved.

关键词： Nucleation

来源：评论

学校读者我要写书评

暂无评论

Investigation of curvature statistics of turbulent premixed Bunsen flames based on leading points concept 12

Investigation of curvature statistics of turbulent premixed ...

引用

1.th Asia-Pacific Conference on Combustion, ASPACC 201.

作者： Zhang, Weijie Wang, Jinhua Xia, Hao Lin, Wenjun Zhang, Meng Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28 Xian Ning Road Beilin District Xi'an Shaanxi710049 China

In previous studies, it was showed that the leading point, namely, the positively curved flame front, may be vital in controlling the propagation of flame, thus controlling the burning intensity of turbulent premixed flames. This paper is aimed at investigating the morphologies of the leading points under low and relatively high turbulence intensities based on flame curvature statistics. Premixed C3H8/H2/air flames were obtained with a Bunsen burner. Flame front was captured with OH-PLIF technique. The results show prevalent leading points with positive curvatures at low turbulence intensity. Percentage of positive curvatures were observed to increase at lower turbulence intensity. However, with increasing turbulence intensity, such feature can be mitigated or even overpowered with equal probability of negative and positive curvatures. Proper models for leading point are recommended according to the experimental results. However, question remains as to the underlying mechanism of leading point concept. © Asia-Pacific Conference on Combustion, ASPACC *** right reserved.

关键词： Combustion

来源：评论

学校读者我要写书评

暂无评论

Influence of the initial condition on pool water instantaneous flash evaporation

引用

Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2008年第8期29卷 1335-1338页

作者： Guo, Ying-Li Deng, Wei Yan, Jun-Jie Wang, Gui-Fang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

An experimental study has been performed to investigate pool water instantaneous flash evaporation in a rectangle chamber. The water level was at 40 mm, 60 mm, 1.0 mm, 1.0 mm. Initial conditions of the liquid varied from 55 to 88C temperature and 3 to 35C superheat. Visualization of the phenomenon using a CCD camera lets us firstly point out the influence of the initial conditions on the flashing phenomenon. The experimental results show that at a constant initial water temperature, the greater the superheat approaches, the more quickly the liquid temperature will decrease. At a constant superheat, the initial water temperature has little influence on the decrease rate of the water temperature. The higher the water level will be, the slower the water temperature will decrease as well as the higher the water temperature will be when the flashing is finished. Experimental study allows us to correlate the water temperature with the initial water temperature and the superheat while flashing is going.

关键词： Water temperature

来源：评论

学校读者我要写书评

暂无评论

GLOBAL STABILITY OF AN EPIDEMIC MODEL FOR VECTOR-BORNE DISEASE

引用

Journal of Systems Science & Complexity 2010年第2期23卷 279-292页

作者： Hongzhi YANG Huiming WEI Xuezhi LI Faculty of Science Xi'an Jiaotong University Xi'an 710049 China. State Key Laboratory of Multiphase Flow in Power Engineering Xian Jiaotong University Xi'an 710049China Department of Mathematics Xinyang Normal University Xinyang 464000 China. Department of Mathematics Xinyang Normal University Xinyang 464000 China

This paper considers an epidemic model of a vector-borne disease which has the vectormediated transmission only. The incidence term is of the bilinear mass-action form. It is shown that the global dynamics is completely determined by the basic reproduction number Ro. If Ro ≤ 1. the diseasefree equilibrium is globally stable and the disease dies out. If Ro 〉 1. a unique endemic equilibrium is globally stable in the interior of the feasible region and the disease persists at the endemic equilibrium. Numerical simulations are presented to illustrate the results.

关键词： Basic reproduction number endemic equilibrium epidemic model global stability vectorborne disease.

来源：评论

学校读者我要写书评

暂无评论

Bubble packing method based unstructured grid generation of curved-edge polygon with its application

引用

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2009年第11期43卷 109-113页

作者： Wu, Lilong Zhou, Gaoling Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

An algorithm for bubble packing method based unstructured grid generation of a curved-edge polygon is developed to avoid bubble departure from a curved boundary during dynamic bubble movement. The curve boundary is mapped into a straight line to allow bubble adding and moving. Then the bubble position is mapped into the curve boundary by the arc-length parameterization method. Combined with conventional methods, a new method to judge a point in a given curved-edge polygon is proposed. Local grid refinement is realized by adding different size bubbles to the real and artificial vertices and setting the bubble's radius by the weighted average method. Moreover, the SIMPLE algorithm on unstructured collocated grid systems is developed and applied to simulate the lid-driven flow in a polar cavity. The numerical simulation results agree well with the experimental data under different Reynolds numbers.

关键词： Reynolds number

来源：评论

学校读者我要写书评

暂无评论

Life cycle assessment of a 1.00 MW supercritical pulverized coal power plant under partial loads 31

Life cycle assessment of a 1000 MW supercritical pulverized ...

引用

31.t International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 201.

作者： Han, Xiaoqu Chen, Nana Karellas, Sotirios Liu, Ming Liu, Jiping Yan, Junjie Kakaras, Emmanuel State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China Laboratory of Steam Boilers and Thermal Plants National Technical University of Athens Athens Greece

ISBN: (纸本)9789729959646

With increasing share of renewable energy sources, pulverized coal (PC) power plants have to participate in peak load regulations frequently and operate in partial loads regularly. The energy efficiency and eco-efficiency are both affected significantly in this manner. Therefore, an overall concept for the estimation of environmental impacts from PC plants under nominal and partial loads should be established in life cycle assessment (LCA) methodology. In the present work, a 1.00 MW supercritical coal-fired unit, which is the main force for power supply in China, was modeled using commercial simulation tools (GSE and SimaPro). The aim is to investigate the environmental impacts under different working conditions from the perspective of LCA. Moreover, a partial load feedwater heating system with ejector in a coal-fired power unit was proposed and investigated. Model validation and LCA analysis under nominal load show that GWP and PCOP are the main environmental impacts of PC plants. But AP and EP are also serious concerns. Under partial loads, the AP and EP increase significantly, resulted from the reduction in NOx removal efficiency. It is thereby concluded that the mechanisms of formation, migration, and removal of different kinds of pollutant emissions influence the LCA results significantly. Therefore, operation optimization was carried out based on the guidelines of the LCA framework, to reduce the environmental impacts of PC power plants under partial loads. It is indicated that through the integration of an ejector, the NOx removal efficiency at extremely low load (30%) can be maintained at a high level. The environment impact potentials can thus be reduced effectively. © 201. University of Minho. All rights reserved.

关键词： Emission control

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：