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Characterization of mixing in an optimized designed t–t mixer with cylindrical elements

Chinese Journal of Chemical Engineering 2019年第10期27卷 2337-2351页

作者： t.Manoj Dundi V.R.K.Raju V.P.Chandramohan Mechanical Engineering Department National Institute of TechnologyWarangalTelangana StateIndia

Passive micromixers are preferred over active mixers for many microfluidic applications due to their relative ease in integration into complex systems and operational *** also incur very low cost of ***,the degree of mixing is comparatively low in passive mixers than active mixers due to the absence of disturbance in the flow by external forces and the inherent laminar nature of microchannel *** designs of complex channel structures and three-dimensional geometries have been investigated in the past to obtain an efficient mixing in passive *** the studies on mixing enhancement with simple planar geometries of passive mixers have been few and *** present work aims to investigate the possibility of mixing enhancement by employing simple planar type designs,such as t-mixer and t–t mixer with cylindrical elements placed in the mixing *** mixing performance has been evaluated in the Reynolds number range of 6 *** results have shown that t–t mixer with cylindrical elements performed significantly well and obtained very good mixing quality over basic t-mixer for the entire range of Reynolds number(6 to 700).the device has also shown better mixing as compared to basic t–t mixer and t-mixer with cylindrical elements.A larger pair of vortices formed in the stagnation area due to the presence of a cylindrical element in the *** elements downstream caused significant enhancement in mixing due to splitting and recombining *** size of the cylindrical element in the t–t mixer has been optimized to obtain better mixing performance of the *** improvement in mixing quality by t–t mixer with cylindrical elements has been obtained at the expense of small rise in pressure drop as compared to other passive designs considered in this ***,the current design of t–t mixer with cylindrical elements can act as an effective and simple passive mixing device for various mi

关键词： CFD-simulation Cylindrical elements Micromixers Mixing quality Obstructions t–t-mixer

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Current status of duplex surface engineered ti-based materials

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 6-12页

作者： t.Bell School of Engineering (Metallurgy and Materials) The University of Birmingham Birmingham B15 2TT UK

Industrial exploitation of the high specific strength and corrosion resistance of titanium were dominated historically by the technological advances which have been made in gas-turbine engine and aircraft components. Realization of the possible benefits in general engineering has been limited by the absence of any proven and reliable means of overcoming the poor wear resistance and galling tendency suffered by titanium alloys when in contact with other materials. this problem can only be addressed by optimizing and demonstrating industrially viable surface engineering processes for titanium in general engineering. the status of single and duplex surface engineering systems are reviewed. In addition, in order to fully realize the potential of advanced surface engineering of titanium components contact mechanics models are developed to enable the automotive engineers to design dynamically the loaded automotive engine and transmission components.

关键词： ti-based material specific strength corrosion resistance

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Electrically pumped metallic and plasmonic nanolasers

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Chinese Physics B 2018年第11期27卷 158-166页

作者： Martin t Hill School of Electrical Electronic and Computer Engineering The University of Western Australia

In recent years, there have been a significant number of demonstrations of small metallic and plasmonic lasers. the vast majority of these demonstrations have been for optically pumped devices. Electrically pumped devices are advantageous for applications and could demonstrate concepts not amenable for optical pumping. However, there have been relatively few demonstrations of electrically pumped small metal cavity lasers. this lack of results is due to the following reasons： there are limited types of electrically pumped gain media available; there is a significantly greater level of complexity required in the fabrication of electrically pumped devices; finally, the required components for electrical pumping restrict cavity design options and furthermore make it intrinsically more difficult to achieve lasing. this review looks at the motivation for electrically pumped nanolasers, the key issues that need addressing for them to be realized, the results that have been achieved so far including devices where lasing has not been achieved, and potential new directions that could be pursued.

关键词： semiconductor lasers laser diode microcavity and microdisk laser integrated optics

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Development of the PARASOL Code and Full Particle Simulation of tokamak Plasma with an Open-Field SOL-Divertor Region Using PARASOL

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Plasma Science and technology 2011年第3期13卷 316-325页

作者： t. tAKIZUKA Japan Atomic Energy Agency Naka Fusion Institute Naka 311-0193 Japan

the PARASOL code and the simulation by using PARASOL are introduced briefly. the PARASOL code with particle-in-cell （PIC） method and binary collision model was developed in JAERI and JAEA. Simulations using PARASOL code were carried out in order to investigate the power and particle control with diveror system in fusion reactors. the one-dimensional （1D） version of PARASOL was adopted to investigate the Bohm criterion, the supersonic flow, the SOL heat conduction, and so on. the heat propagation due to edge localized mode （ELM） was studied with the 1D-dynamic PARASOL. the two-dimensional version of PARASOL for the whole tokamak plasma including scrape-off-layer （SOL）-divertor region was useful for simulating the SOL flow pattern, the electric field formation etc. Based on PARASOL simulation results, improved physics modeling for the fluid simulation was built up.

关键词： tolkamak plasma scrape-off layer divertor sheath heat transport plasmaflow radial electric field particle simulation collision model

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Nonequilibrium behavior of the kinetic metamagnetic spin-5/2 Blume–Capel model

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Chinese Physics B 2014年第7期23卷 350-359页

作者： müt temizer Department of Physics Bozok University

the dynamic magnetic behavior of the kinetic metamagnetic spin-5/2 Blume-Capel model is examined, within a mean-field approach, under a time-dependent oscillating magnetic field. to describe the kinetics of the system, Glauber- type stochastic dynamics has been utilized. the mean-field dynamic equations of the model are obtained from the Master equation. Firstly, these dynamic equations are solved to find the phases in the system. then, the dynamic phase transition temperatures are obtained by investigating the thermal behavior of dynamic sublattice magnetizations. Moreover, from this investigation, the nature of the phase transitions （first- or second-order） is characterized. Finally, the dynamic phase diagrams are plotted in five different planes. It is found that the dynamic phase diagrams contain the paramagnetic （P）, antiferromagnetic （AF5/2, AF3/2, AF1/2） phases and five different mixed phases. the phase diagrams also display many dynamic critical points, such as tricritical point, triple point, quadruple point, double critical end point and separating point.

关键词： metamagnetism spin-5/2 Blume-Capel model dynamic phase transitions dynamic phase dia-grams Glauber-type stochastic dynamics

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Contemplation on some cyclic N_8 isomers-A DFt treatment

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Defence technology（防务技术） 2018年第1期14卷 19-27页

作者： Lemi türker Middle East technical University Department of Chemistry

Various cyclic N_8 isomers are considered at the levels of B3 LYP/6-311++G(d,p) and B3 LYP/c PVtZ. Some energies and molecular orbital properties are obtained. the structures are found to be stable in the singlet state but mostly unstable in the triplet. the heats of formation values calculated by means of t1 recipe reveals that they are highly endothermic. NICS(0) values have been calculated and aromaticity/antiaromaticity of the rings are discussed. Additionally, theoretical IR,UV-VIS spectra and the calculated impulse values have been obtained.

关键词： Polynitrogen compounds Cyclic octanitrogen structures NICS Explosives Specific impulse DFt calculations

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EXACt SOLUtIONS OF A DIPOLAR FLUID FLOW

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Acta Mechanica Sinica 2003年第4期19卷 308-314页

作者： t.HAYAt DepartmentofMathematics Quaid-i-AzamUniversityIslamabad44000Pakistan

Exact solutions for three canonical flow problems of a dipolar fluid are obtained: (i) the flow of a dipolar fluid due to a suddenly accelerated plate, (ii) the flow generated by periodic oscillation of a plate, (iii) the flow due to plate oscillation in the presence of a transverse magnetic field. the solutions of some interesting flows caused by an arbitrary velocity of the plate and of certain special oscillations are also obtained.

关键词： unsteady flows dipolar fluid periodic oscillations MHD flow

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Large deformation plasticity From basic relations to finite deformation

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Acta Mechanica Sinica 2020年第2期36卷 472-492页

作者： Otto t.Bruhns Institute of Mechanics Ruhr-University Bochum44780 BochumGermany

the theory of plasticity as a special field of continuum mechanics deals with the irreversible,***,deformation of *** the action of given loads or deformations,the state of the stresses and strains or the strain rates in these bodies is *** this way,it complements the theory of elasticity for the reversible behavior of *** practice,it has been observed that many materials behave elastically up to a certain load(yield point),beyond that load,however,increasingly plastic or *** combination of these two material properties is known as *** classical elastoplastic material behavior is assumed to be time-independent or *** contrast,we call a time-or rate-dependent behavior visco-elastoplastic and visco-plastic—if the elastic part of the deformation is *** plasticity theory,because of the given loads the states of the state variables stress,strain and temperature as well as their changes are *** this purpose,the observed phenomena are introduced and put into mathematical *** constitutive relations describing the specific material behavior are finally embedded in the fundamental relations of continuum theory and ***,the theory of plasticity was introduced in order to better estimate the strength of *** analysis based purely on elastic codes is not in a position to do this,and can occasionally even lead to incorrect *** the other hand,the entire field of forming techniques requires a theory for the description of plastic *** from the classical description of plastic behavior with small deformations,the present review is intended to provide an insight into the state of the art when taking into account finite deformations.

关键词： Finite deformation Elasto-plasticity Constitutive relations thermodynamics History of plasticity

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Late Ordovician Mass Extinction: Earth, fire and ice

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National Science Review 2024年第1期11卷 51-65页

作者： David A.t.Harper Palaeoecosystems Group Department of Earth SciencesDurham University

the Late Ordovician Mass Extinction was the earliest of the ‘big’ five extinction events and the earliest to affect the trajectory of metazoan life. two phases have been identified near the start of the Hirnantian period and in the middle. It was a massive taxonomic extinction, a weak phylogenetic extinction and a relatively benign ecological extinction. A rapid cooling, triggering a major ice age that reduced the temperature of surface waters, prompted a drop in sea level of some 100 m and introduced toxic bottom waters onto the shelves. these symptoms of more fundamental planetary processes have been associated with a range of factors with an underlying driver identified as volcanicity. Volcanic eruptions, and other products, may have extended back in time to at least the Sandbian and early Katian, suggesting the extinctions were more protracted and influential than hitherto documented.

关键词： Ordovician LOME paleoecology palaeobiogeography biotas

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Preparation of microparticles and nanoparticles using membrane-assisted dispersion,micromixing,and evaporation processes

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Particuology 2024年第1期84卷 30-44页

作者： Goran t.Vladisavljevic Chemical Engineering Department Loughborough UniversityLoughboroughLeicestershire LE113TUUnited Kingdom

Synthetic microporous membranes are increasingly used for energy-efficient and controlled production of micro-and nanoparticles and micro-and nanoemulsions with tuneable morphology and physico-chemical properties through various micromixing,emulsification,and evaporation *** emul-sification processes,the membrane pores are used for dispersed phase injection and size-controlled generation of droplets and droplet-templated *** micromixing processes,membrane is utilised as a micromixer for mixing two miscible liquids,usually solvent and antisolvent-rich solutions,which leads to the creation of supersaturation and subsequent nanoprecipitation or *** mem-brane evaporation processes,membrane is used to prevent phase dispersion while allowing efficient molecular diffusion of solvent and/or antisolvent vapour through gas-filled *** dispersion processes can be operated continuously by decoupling shear stress on the membrane surface from cross flow using tube insets,flow pulsations,swirling flow,membrane oscillations or membrane *** generation and solidification can be performed continuously in a single pass by connecting membrane module with a downstream *** dispersion processes can be used for pro-duction of nanoparticles such as nanovesicles(liposomes,micelles,ethosomes,and niosomes),nanogels,polymeric,lipid and metallic nanoparticles,and *** main advantages of membrane-assisted particle generation are in low energy consumption,controlled geometry and hydrodynamic conditions at the microscale level,flexible throughput due to modular and scalable design of membrane devices,and a wide choice of available microporous membranes with various wall porosities,wetta-bilities,pore sizes,and pore morphologies to suit different applications.

关键词： Nanoparticles Microparticles Nanoemulsions Microemulsions Microporous membrane Crystallisation Flash nanoprecipitation Emulsification Zero liquid discharge

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