检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2021年第3期42卷 387-404页

作者： Ziang WANG Bin YU Bin ZHANG Miaosheng HE Hong LIU School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China

The underlying effect of vortex interaction characterized by the merging and non-merging on mixing enhancement is of fundamental significance to understand the flow dynamics of strut injectors in *** from a simplified configuration of a vortex generator,this study focuses on the influence of geometric parameters on vortex structures and fluid mixing through compressible Navier-Stokes(NS)*** adjusting the induction of outer vortices,the inner co-rotating vortex pair exhibits two modes of interaction(merging/separation regime)reflected by closer/farther vortex *** by the zero variation rate of the inner vortex spacing,the critical state of equilibrium is *** critical condition is well predicted by a theoretical model based on the Biot-Savart *** the introduction of mixedness and mixing time,the intrinsic impact of interaction modes on fluid mixing is *** with the vortex dynamics in the merging regime,the one in the separation regime is more effective for passive scalar mixing *** efficient material stretching characterized by the higher interface stretching factor and averaging finite-time Lyapunov exponent(FTLE),the mixing time is shortened by as much as 2.5 times in the separation *** implication of the present two interaction regimes in mixing enhancement physically reflected by the averaging FTLE has the potential to improve the combustion performance and shorten the combustor chamber.

关键词： vortex interaction mode fluid mixing Lagrangian coherent structure(LCS) stretching effect

Application of electrical capacitance tomography for imaging industrial processes

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第12期6卷 1374-1378页

作者： DYAKOWSKI Tom School of Chemical Engineering and Analytical Science The University of Manchester Manchester M60 1QD UK

Electrical tomography is, in certain cases, the most attractive method for real imaging of industrial processes, because of its inherent simplicity, rugged construction of the tomographer and high-speed capability. This paper presents examples illus- trating applications of electrical tomography for imaging fluidized beds, bubble columns and pneumatic conveyors. Electrical tomography opens up new ways for processing, imaging and modelling multi-phase flows as shown by 2D and 3D images illus- trating the various types of flow morphology.

关键词： Process imaging fluid mixing Stired vessel

Study on Desulphurization in Molten Iron Pretreatment Process Based on a New Stirring Method

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S2期18卷 107-112页

作者： LIANG Ru-quan1, JI Jun-hong1,2, HE Ji-cheng1 (1. Key Laboratory of National Education Ministry for Electromagnetic Process of Materials, Northeastern University, Shenyang 110819, Liaoning, China 2. School of Mechanics and Engineering, Liaoning Technical University,Fuxin 123000, Liaoning, China) Northeastern Univ Key Lab Natl Educ Minist Electromagnet Proc Mat Shenyang 110819 Liaoning Peoples R China Liaoning Tech Univ Sch Mech & Engn Fuxin 123000 Peoples R China

In this work, numerical simulations for the flow characteristics in a tank of KR mechanical stirring or/and gas injection are performed using the Fluent software. The Eulerian multi-fluid model is employed along with the standard k-ε turbulence model to simulate the gas-liquid flow in the stirring tank. A multiple reference frame approach is used to model the impeller rotation. Combined the KR mechanical stirring method and gas injection method, a new gas injection plus mechanical stirring method is proposed. The present results show that the gas phase distributes widely in the eccentric gas injection plus mechanical stirring tank. Therefore, the gas holdup would be increased and the better gas-liquid mixing effect can be obtained in the gas injection plus mechanical stirring case.

关键词： KR mechanical stirring gas injection numerical simulation fluid mixing magnesium desulphurization

DynamicalMotion Driven by Periodic Forcing on an Open Elastic Tube in fluid

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2012年第7期12卷 494-514页

作者： Wanho Lee Sookkyung Lim Eunok Jung Konkuk University Department of Mathematics1 Hwayang-dongGwangjin-guSeoul143-701Republic of Korea University of Cincinnati Department of Mathematical Sciences839 Old ChemCincinnatiOH 45221USA

We present a three dimensional model of an open elastic tube immersed in fluid to understand valveless pumping mechanism.A fluid-tube interaction problem is simulated by the volume conserved immersed boundarymethodwhich prevents the generation of spurious velocity field near the tube and local cluster of the tube *** order to explain pumping phenomena without valves,average net flow ismeasured by changing parameter values such as pumping frequency,compression duration,and pumping *** frequencies that make the system reach maximal or minimal net flow are selected to study case by *** also study the effectiveness of fluid mixing using the Shannon entropy increase rate.

关键词： Valveless pumping volume conserved immersed boundary method fluid mixing average net flow

Electrical process tomography: seeing “without eyes” inside stirred vessels

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第12期6卷 1379-1385页

作者： MANN R. Department of Chemical Engineering and Analytical Science The University of Manchester Manchester M60 1QD UK

Body-scanning exploiting 3-D imaging has revolutionised diagnostics and treatment in medicine. Process engineers would like to be similarly able to image chemical process units in 3-D, but without the Lmulti-million price tag. UMIST and Leeds University have together, through the Virtual Centre for Industrial Process Tomography （http：//***）, pioneered several electrical process tomography techniques and used them in a variety of applications. Illustrations are presented to show how electrical resistance tomography （ERT） has been developed for typical stirred vessels widely encountered in batch process manufacturing. The technique is potentially fast and inexpensive and capable of imaging both dynamic and pseudo-stationary processes. Examples from UMIST＇s two-tonne vessel will be presented for miscible tracer mixing, as well as gas-liquid and solid-liquid mixing.

关键词： Process imaging fluid mixing Stired vessel

Evidence of fluid evolution of Baoshan Cu−Pb−Zn polymetallic deposit:Constraints from in-situ sulfur isotope and trace element compositions of pyrite

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2021年第11期31卷 3530-3548页

作者： Jun-ke ZHANG Yong-jun SHAO Ke CHEN Hua-jie TAN Rui-chang TAN Tian-dong ZHANG Zhong-fa LIU Key Laboratory of Metallogenic Prediction of Nonferrous Metals Ministry of EducationCentral South UniversityChangsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China

In-situ LA-ICP-MS and S isotopes of pyrite from the Baoshan Cu polymetallic deposit were conducted to investigate the ore-forming process and the enrichment mechanism of *** generations of pyrite (Py Ⅰ,Py Ⅱ,and Py Ⅲ) in the skarn-type ores and pyrite in the carbonate-hosted sulfide ores from central,western,and northern(C_Py,W_Py,and N_Py) mining districts are selected for *** with Py Ⅰ and Py Ⅲ,the contents of most elements in Py Ⅱ are apparently *** As and Se contents are high within a wide range and are decoupled in the growth band of the C_*** highest As,Se,and Pb contents were found in W_Py and N_*** results indicate the drastic changes in the temperature and fluid mixing during the *** occurrence of fluctuation and change in temperature and f(O_(2)) was triggered by intermittent pulses of magmatic-hydrothermal fluids,mixing with meteoric water,and water-rock *** sulfur isotopes of all species of pyrite indicated the magmatic *** change in the f(O_(2)) conditions caused slight differences in the sulfur isotope ***,a metallogenic model was proposed to explain the ore-forming processes.

关键词： pyrite trace element in-situ S isotope hydraulic fracturing fluid mixing

BUBBLE COMPETITION IN THE RAYLEIGH-TAYLOR INSTABILITY

在线全文

学校读者我要写书评

暂无评论

BUBBLE COMPETITION IN THE RAYLEIGH-TAYLOR INSTABILITY

fluid inclusion and stable isotope constraints on the genesis of the Mazhuangshan gold deposit,eastern Tianshan Mountains of China.

第4届国际流体力学学术会议

作者： Lili Wang Jiachun LiInstitute of Applied Physics and Computational Mathematics Beijing 100088 ChinaInstitute of Mechanics Chinese Academy of Sciences Beijing 100080 China

＜正＞The Rayleigh-Taylor instability is a kind of interfacial instability, which is a very important factor to be considered in the inertial confinement fusion. With the passive scalar transport model, the behaviors of bubbles with various initial length scales are simulated in this paper. It appears that the competition mechanism among bubbles in different length scale plays an important role in the Rayleigh-Taylor instability. The mixing process in the vertical direction may be considerably suppressed by the interaction between bubbles in different scales.

关键词： Rayleigh-Taylor instability fluid mixing passive scalar model inertial confinement fusion multi-scale interaction

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Fluid inclusion and stable isotope constraints on the genesi...