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Rotational manipulation of massive particles in a 2D acoustofluidic chamber constituted by multiple nonlinear vibration sources

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Chinese Physics B 2022年第4期31卷 361-372页

作者： qiang tang Pengzhan Liu Shuai tang Jiangsu Provincal Engineering Research Center for Biomedical Materials and Advanced Medical Devices Faculty of Mechanical and Material EngineeringHuaiyin Institute of TechnologyHuaian 223003China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Advanced Manufacturing Technology Faculty of Mechanical and Material EngineeringHuaiyin Institute of TechnologyHuaian 223003China

Rotational manipulation of massive particles and biolo gical samples is essential for the development of miniaturized lab-on-a-chip platforms in the fields of chemical,medical,and biological *** this paper,a device concept of a two-dimensional acoustofluidic chamber actuated by multiple nonlinear vibration sources is *** functional chamber enables the generation of acoustic streaming vortices for potential applications that include strong mixing of multiphase flows and rotational manipulation of micro-/nano-scale objects without any rotating *** numerical simulations,we find that diversified acoustofluidic fields can be generated in the chamber under various actuations,and massive polystyrene beads inside can experience different acoustophoretic motions under the combined effect of an acoustic radiation force and acoustic ***,we investigate and clarify the effects of structural design on modulation of the acoustofluidic fields in the *** believe the presented study could not only provide a promising potential tool for rotational acoustofluidic manipulation,but could also bring this community some useful design insights into the achievement of desired acoustofluidic fields for assorted microfluidic applications.

关键词： acoustic streaming acoustofluidics ultrasonic vibration rotational manipulation

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SYSTHESIS OF DOUBLE-HYDROPHILIC CORE-SHELL TYPE MULTIARM STAR COPOLYMER POLYETHYLENIMINE-block-POLY(2-HYDROXYETHYL METHACRYLATE)

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Chinese Journal of Polymer Science 2013年第7期31卷 1046-1055页

作者： qiang tang Fa Cheng Jin Cui 陈宇 School of Chemical and Environmental Engineering Hubei University of Technology Department of Chemistry School of SciencesTianjin University National Foodstuff Inspection Center Tianjin Product Quality Inspection Technology Research Institute

Multiarm star block copolymers hyperbranched polyethylenimine-b-poly（2-hydroxyethyl methacrylate）（HPEI-b- PHEMA） with average 28 PHEMA arms have been prepared by atom transfer radical polymerization （ATRP） of HEMA in a mixed solvent of methanol and water using a core-first strategy. The hyperbranched macroinitiator employed was prepared on the basis of well-defined hyperbranched polyethylenimine with Mw/Mn of 1.04 by amidation with 2-bromo-isobutyryl bromide. The polymerization condition was optimized to prepare star copolymers with narrow dispersity, and the variables included the volume ratio of methanol to water, the molar ratio of initiating site to CuC1 and the molar ratio of [CuCl]：[CuBr2]. Under the optimized polymerization condition, the lowest Mw/Mn value of the obtained star copolymers was around 1.3. Kinetic analysis showed that an induction period existed in the polymerization of HEMA. After this induction period, a linear dependence of ln（[M]0/[M]t） on time was observed. The obtained HPEI-b-PHEMA could adsorb hydrophilic molecules. The comparison with the star copolymer with hydrophobic core and hydrophilic PHEMA shell verified that both the hydrophilic core and shell could host the hydrophilic guests, but the amidated HPEI core was more effective than the PHEMA shell.

关键词： Atom transfer radical polymerization Hyperbranched Polyethylenimine Poly(2-hydroxyethyl methacrylate) Star polymers.

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Artificial boundary conditions for Euler–Bernoulli beam equation

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Acta Mechanica Sinica 2014年第5期30卷 687-692页

作者： Shao-qiang tang Eduard G.Karpov HEDPS CAPT and LTCS College of EngineeringPeking University Department of Civil and Materials Engineering University of Illinois at ChicagoChicago IL60607 USA

In a semi-discretized Euler-Bernoulli beam equa- tion, the non-nearest neighboring interaction and large span of temporal scales for wave propagations pose challenges to the effectiveness and stability for artificial boundary treat- ments. With the discrete equation regarded as an atomic lattice with a three-atom potential, two accurate artificial boundary conditions are first derived here. Reflection co- efficient and numerical tests illustrate the capability of the proposed methods. In particular, the time history treatment gives an exact boundary condition, yet with sensitivity to nu- merical implementations. The ALEX （almost EXact） bound- ary condition is numerically more effective.

关键词： Euler-Bernoulli beam. Artificial boundary con- dition - Wave propagation

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Simulation on Evaporation and Motion of Atomized Droplets in Spray Dry Flue Gas Desulfurization Tower

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Journal of Thermal Science 2022年第6期31卷 2252-2263页

作者： ZHANG Tengfei tang qiang PU Chao YAN Yunfei Key Laboratory of Low-grade Energy Utilization Technologies and Systems Ministry of EducationChongqing UniversityChongqing400044China

The evaporation and motion of atomized droplets have an essential effect on the safe and efficient long-term operation of the desulphurization tower. Therefore, the two-phase flow model is established and solved by three-dimensional steady Reynolds-averaged Navier-Stokes equations;the droplets are tracked by Eulerian-Lagrangian method. The three factors, including inlet swirling flow of flue gas, initial droplet diameter, and inlet flue gas temperature, are analyzed to show the effects on the evaporation and motion of atomized droplets, respectively. The results show that the swirling flow of flue gas and initial droplet diameter dominate the penetration length of the atomized droplets and the mixing characteristic of droplets and flue gas. With the increase of droplet diameter, the length of droplet penetrating flue gas increases. When droplet diameter is 200 μm and inlet swirl number is 0.35, droplets completely penetrate the core area. Therefore, this is the maximum initial droplet diameter at the inlet swirl number of 0.35. The droplets evaporation time of initial 150 μm diameter is 85.5% longer than that of 50 μm droplets(0.35 of inlet swirl number). Increasing the inlet flue gas temperature can enhance the heat transfer. When inlet flue gas temperature rises from 483 K to 523 K, the evaporation time decreases by 33.8%. The results can be used to guide the optimization of droplets spray evaporation under practical operating conditions in the desulfurization tower.

关键词： spray dry FGD atomized droplets swirling flow penetration length droplet evaporation

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TF/TA^2 trajectory tracking using nonlinear predictive control approach

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Journal of Systems Engineering and Electronics 2006年第2期17卷 396-401页

作者： tang qiang Zhang Xinguo Liu Xicheng Coll. of Automation Northwestern Polytechnical Univ. Xi'an 710072 P. R. China Flight Automatic Control Research Inst. Xi'an 710065P. R. China

The use of a methodology of nonlinear continuous predictive control to design the guidance control law for the aircraft TF/TA2 trajectory tracking problem is emptojed. For the derivation of the predictive control law, by using Taylor series expansion, and based on optimizing a performance index which is a quadratic function of both the predictive value of the state variables and the control inputs, a state variable feedback controller for nonlinear systems is obtained, and it provides a tradeoff between satisfactory tracking performance and the control magnitude requirements. Numerical simulation results for a supersonic fighter aircraft model show the viability of this approach.

关键词： TF/TA^2 trajectory tracking nonlinear predictive control simulation.

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Influence of isothermal bainitic processing on the mechanical properties and microstructure characterization of TRIP steel

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Journal of University of Science and Technology Beijing 2008年第5期15卷 574-579页

作者： Haitao Jiang Hubin Wu Di tang qiang Liu National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing 100083 China

The mechanical properties of transformation induced plasticity （TRIP） steel are strongly affected by the conditions of iso-thermal bainitic processing. The multiphase microstructure of TRIP steel under different conditions of isothermal bainitic processing was investigated using OM,SEM,XRD and TEM. The volume fraction of retained austenite and the carbon content in austenite were determined quantitatively using X-ray diffraction patterns. The relationship between mechanical properties and isothermal bainitic processing parameters was investigated. The stability of retained austenite was analyzed by the volume fraction of retained austenite and the carbon content in retained austenite. The experimental results show that the multiphase microstructure consists of ferrite,bainite and metastable retained *** obtain good mechanical properties,the optimal conditions of isothermal bainitic temperature and holding time are 410-430°C and 180-240 s,respectively. After isothermal bainitic processing under the optimal conditions,the corresponding volume fraction of retained austenite is 5vol%-15vol%,which can provide enough retained austenite and plastic stability for austenite with high carbon content.

关键词： transformation induced plasticity steel isothermal bainitic processing mechanical properties microstructure

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Synthesis of 1,1'-binaphthyl-2,2'-diamine from 2-naphthol under atmospheric pressure

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Chinese Chemical Letters 2009年第10期20卷 1150-1152页

作者： qiang Feng Chao Zhang qiang tang Mei Ming Luo Key Laboratory of Green Chemistry & Technology of Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China

A practical protocol to obtain 1,1′-binaphthyl-2,2′-diamine was developed from 2-naphthol and 2-naphthylhydrazine under mild conditions： solvent-free, 125-130 ℃, atmospheric pressure. The convenient procedure make... 详细信息

关键词： 1,1′-Binaphthyl-2,2′-diamine 2-Naphthol 2-Naphthylhydrazine Synthesis

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A dynamic solution for predicting resonant frequency of piston mode fluid oscillation in moonpools/narrow gaps

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Journal of Hydrodynamics 2020年第1期32卷 54-69页

作者： Lei Tan Lin Lu Guo-qiang tang Liang Cheng State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China International Joint Laboratory on Offshore Oil and Gas Engineering Dalian University of TechnologyDalian 116024China School of Engineering The University of Western AustraliaPerthAustralia

The objective of this study is to develop a simple tool for predicting the resonant frequency of the piston mode wave oscillation in a moonpool or a narrow gap between twin floating *** on the dynamic analysis and the domain-decomposition,a linear harmonic oscillator model for the fluid oscillation in a confined space is formulated,which immediately leads to an explicit dynamic solution for the resonant *** the model,it is assumed that the water depth is equal to or greater than a critical value dependent on the ratio of the draft to the breadth of the floating *** predicted resonant frequencies are compared with the numerical results of the linear potential model and the viscous fluid model,the semi-analytical potential solutions and the experimental *** agreements are observed for a wide range of geometric parameters of the moonpool and the narrow gap of either sharp or round edge *** present dynamic method is also applied to predict the resonant frequency of the piston mode oscillation in the gap between a floating body and a vertical wall with a reasonable success.

关键词： Resonant frequency piston mode resonance moonpool narrow gap dynamic model

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Experimental Study of Local Scour Around Four Piles Under Different Attack Angles and Gap Ratios

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China Ocean Engineering 2024年第4期38卷 612-624页

作者： LIU Ming-ming tang Guo-qiang JIN Xin GENG Shao-yang School of Architecture and Engineering Liaocheng UniversityLiaocheng 252000China Water-Sediment Regulation and Sand Effective Utilization Special Laboratory of Shandong Provincial Education Department Liaocheng UniversityLiaocheng 252000China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China College of Electronic Engineering Chengdu University of Information TechnologyChengdu 610225China College of Energy Chengdu University of TechnologyChengdu 610059China

In an effort to investigate and quantify the patterns of local scour,researchers embarked on an in-depth study using a systematic experimental *** research focused on the effects of local scour around a set of four piles,each subjected to different hydromechanical *** particular,this study aimed to determine how different attack angles—the angles at which the water flow impinges on the piles,and gap ratios—the ratios of the spacing between the piles to their diameters,influence the extent and nature of scour.A comprehensive series of 35 carefully designed experiments were orchestrated,each designed to dissect the nuances in how the gap ratio and attack angle might contribute to changes in the local scour observed at the base of pile *** these experimental trials,a wealth of local scour data were collected to support the *** data included precise topographic profiles of the sediment bed around the pile groups,as well as detailed scour time histories showing the evolution of scour at strategic feature points throughout the test *** analysis of the experimental data provided interesting *** study revealed that the interplay between the gap ratio and the attack angle had a pronounced influence on the scouring dynamics of the pile *** of the key observations was that the initial phases of scour,particularly within the first hour of water flow exposure,were characterized by a sharp increase in the scour depth occurring immediately in front of the *** this initial rapid development,the scour depth transitioned to a more gradual change *** contrast,the scour topography around the piles continuously *** suggests that sediment displacement and the associated sculpting of the seabed around pile foundations are sustained and progressive processes,altering the underwater landscape over *** results of this empirical investigation have significant implications for the design and constructio

关键词： local scour piles gap ratio attack angle

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Thermoluminescence characteristics of Li_2B_4O_7:Cu,Ag,P

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Chinese Science Bulletin 2007年第13期52卷 1776-1779页

作者： XIONG ZhengYe ZHANG ChunXiang tang qiang College of Science Guangdong Ocean University Zhanjiang 524088 China Department of Physics Sun Yat-sen University Guangzhou 510275 China

This paper reports the thermoluminescence (TL) characteristics of lithium borate activated by Cu, Ag and P. The glow curves and spectra of thermoluminescence were measured, and the thermolumines-cence response as a function of the absorbed dose and the fading behavior were studied. The results indicate that TL of this material has a low fading and wide linear dose response (10^(-4)―10~3 Gy).

关键词：热发光 Li2B4O7 铜砷磷光谱

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