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Effect of wall temperature modulation on the heat transfer characteristics of droplet-train flow inside a rectangular microchannel

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Chinese Journal of Chemical Engineering 2020年第3期28卷 685-697页

作者： vivekanand S.v.B.,Raju v.R.k. Department of Mechanical Engineering National Institute of TechnologyWarangalTelangana 506004India

The numerical studies of water–oil two-phase slug flow inside a two-dimensional vertical microchannel subjected to modulated wall temperature boundary conditions have been discussed in the present *** researchers have contributed their efforts in exploring the characteristics of Taylor flows inside microchannel under constant wall heat flux or isothermal wall ***,there is no study available in the literature which discusses the impact of modulated thermal wall boundary conditions on the heat transfer behavior of slug flows inside ***,to bridge this gap,an effort has been made to understand the heat transfer characteristics of the flow under sinusoidal wall temperature ***,a single phase flow and heat transfer study was performed in microchannels,and the results of the fully developed velocity profile and heat transfer rate were validated with benchmark analytical *** an optimal selection of the combination of sinusoidal thermal wall boundary conditions has been made for the two-phase slug flow ***,the effects of amplitude(0 bεb 0.03)and frequency(0 bωb 750πrad·s-1)of the sinusoidal wall temperature profile on the heat transfer have been studied using the optimal combination of the wall boundary *** results of the numerical study using modulated temperature conditions on channel walls showed a significant improvement in the heat transfer over liquid-only flow by approximately 50%as well as over two-phase flow without wall temperature *** non-dimensional temperature contours obtained for different cases of temperature modulation clearly explain the root cause of such improvement in the heat ***,the results based on the hydrodynamics of the flow have also been reported in terms of variation of droplet shapes and film *** influence of Capillary number on the film thickness as well as heat transfer rates has also been *** addition,the measured fil

关键词： Heat transfer Microchannel Modulation Surface tension Taylor flow

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Process parameters optimization for friction stir welding of RDE-40 aluminium alloy using Taguchi technique

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中国有色金属学会会刊：英文版 2008年第3期18卷 548-554页

作者： A.k.LAkSHMINARAYANAN v.BALASUBRAMANIAN Centre for Materials Joining Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar608002 Tamil Nadu India

Taguchi approach was applied to determine the most influential control factors which will yield better tensile strength of the joints of friction stir welded RDE-40 aluminium alloy. In order to evaluate the effect of process parameters such as tool rotational speed, traverse speed and axial force on tensile strength of friction stir welded RDE-40 aluminium alloy, Taguchi parametric design and optimization approach was used. Through the Taguchi parametric design approach, the optimum levels of process parameters were determined. The results indicate that the rotational speed, welding speed and axial force are the significant parameters in deciding the tensile strength of the joint. The predicted optimal value of tensile strength of friction stir welded RDE-40 aluminium alloy is 303 MPa. The results were confirmed by further experiments.

关键词：铝合金摩擦焊接抗张强度加工处理

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Tensile and Impact Properties of Shielded Metal Arc Welded AISI 409M Ferritic Stainless Steel Joints

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Journal of Materials Science & Technology 2009年第2期25卷 181-186页

作者： k. Shanmugam A.k. Lakshminarayanan v. Balasubramanian Centre for Materials Joining & Research (CEMAJOR) Department of Manufacturing Engineering Annamalai UniversityAnnamalai Nagar 608 002 Tamil Nadu India

The present study is concerned with the effect of filler metals such as austenitic stainless steel, ferritic stainless steel and duplex stainless steel on tensile and impact properties of the ferritic stainless steel conforming to AISI 409M grade. Rolled plates of 4 mm thickness were used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure and fracture surface morphology of the joints fabricated by austenitic stainless steel, ferritic stainless steel and duplex stainless steel filler metals were evaluated and the results were reported. From this investigation, it is found that the joints fabricated by duplex stainless steel filler metal showed higher tensile strength and hardness compared to the joints fabricated by austenitic and ferritic stainless steel filler metals. Joints fabricated by austenitic stainless steel filler metal exhibited higher ductility and impact toughness compared with the joints fabricated by ferritic stainless steel and duplex stainless steel filler metals.

关键词： Ferritic stainless steel Shielded metal arc welding Tensile properties Impact toughness

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Systematic study on heavy-particle radioactivity of superheavy nuclei ^(297–300)119

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Nuclear Science and Techniques 2024年第11期35卷 108-123页

作者： Megha Chandran v.k.Anjali k.P.Santhosh Department of Physics University of CalicutThenhipalamKerala 673635India School of Pure and Applied Physics Kannur UniversitySwami Anandatheertha CampusPayyanurKerala 670327India

In the current study,we examined every possible cluster-daughter combination in the heavy-particle decay of isotopes ^(297-300)119 and computed the decay half-lives using the modified generalized liquid drop model(MGLDM)with the preformation factor depending on the disintegration *** predicted half-life of every heavy cluster(Z_(C)≥32)was within the experimentally observable *** results aligned with the predictions of Poenaru et al.[***.107,062503(2011)]that superheavy nuclei(SHN)with Z>110 will release heavy particles with a penetrability comparable to or greater than theα-*** half-lives predicted using the MGLDM for clusters^(89)Rb,^(91)Rb,and^(92)Rb from parents^(297)119,^(299)119,and^(300)119,respectively,agreed with the predictions of Poenaru et al.[***.J.A 54,14(2018)].It was found that the isotopes of heavy clusters kr,Rb,Sr,Pa,In,and Cd had half-lives comparable to theαhalf-life;and isotopes of clusters I,Xe,and Cs had the minimum half-life(10^(-14)s).These observations revealed the role of the shell closure(Z=82,N=82,and N=126)of the cluster and daughter nuclei in heavy-cluster *** predicted that isotope ^(297,299)119 decayed by 4αdecay chains and isotope^(300)119 decayed by 6αdecay chains,while^(298)119 decayed by continuousαdecay *** predicted half-lives and modes of decay of the nuclei in the decay chains of^(297-300)119 agreed with the experimental data,proving the reliability of our *** present study determined the most favorable heavy-cluster emissions from these nuclei and provided suitable projectile-target combinations for their synthesis.

关键词： Cluster radioactivity Alpha radioactivity Superheavy nuclei

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Magnetic nanoparticles and concentrated magnetic nanofluids:Synthesis,properties and some applications

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China Particuology 2007年第1期5卷 43-49页

作者： Ladislau vks Doina Bica Mikhail v. Avdeev Lab Magnetic Fluids CFATR Romanian Academy-Timisoara Division Timisoara Romania National Center for Engineering of Systems with Complex Fluids Univ. Politehnica Timisoara Timisoara Romania Lab Magnetic Fluids CFATR Romanian Academy-Timisoara Division Timisoara Romania Frank Laboratory of Neutron Physics Joint Institute for Nuclear Research Dubna Russia

This paper reviews some recent results concerning chemical synthesis of magnetic nanoparticles and preparation of various types of magnetic nanofluids. Structural properties and behaviour in external magnetic field of magnetic nanofluids will be emphasized with relation to their use in leakage-free rotating seals and in biomedical applications.

关键词： Magnetic nanoparticle Magnetic nanofluid Rotating seal Biomedical application Chemical co-precipitation Structural characterization

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Effect of graphene and its derivatives on thermo-mechanical properties of phase change materials and its applications:a comprehensive review

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Frontiers in Energy 2022年第2期16卷 150-186页

作者： Sumit NAGAR kamal SHARMA A.k.PANDEY v.v.TYAGI Department of Mechanical Engineering GLA UniversityMathura(U.P)-281406India Research Center for Nano-Materials and Energy Technology(RCNMET) School of Engineering and TechnologySunway University47500 Selangor Darul EhsanMalaysia School of Energy Management Shri Mata Vaishno Devi UniversityKatra 182320India

Phase change materials(PCMs)play a leading role in overcoming the growing need of advanced thermal management for the storage and release of thermal energy which is to be used for different solar ***,the effectiveness of PCMs is greatly affected by their poor thermal ***,in the present review the progress made in deploying the graphene(Gr)in PCMs in the last decade for providing the solution to the aforementioned inadequacy is presented and discussed in *** and its derivatives((Gr oxide(GO),Gr aerogel(GA)and Gr nanoplatelets(GNPs))based PCMs can improve the thermal conductivity and shape stability,which may be attributed to the extra ordinary thermo-physical properties of ***,it is expected from this review that the advantages and disadvantages of using Gr nanoparticles provide a deep insight and help the researchers in finding out the exact basic properties and finally the applications of Gr can be *** this work,Gr and its derivatives based PCMs was characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction spectroscopy(XRD),and scanning electron microscopy(SEM)by which crystal structure was known,phase was identified along with the knowledge of surface structure *** increase in the mass fraction(%)of the filler(Gr and its derivatives)led to even better thermo-physical properties and thermal *** thermal characterization was also done by differential scanning calorimetry(DSC),thermo gravimetric analysis(TGA)and thermal conductivity *** enthalpy of freezing and melting showed that Gr and its derivatives based PCMs had a very high energy storage capability as reflected in its various applications.

关键词： phase change materials(PCMs) graphene thermal conductivity characterization

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Bioorthogonal chemistry:a covalent strategy for the study of biological systems

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Science China Chemistry 2010年第1期53卷 61-70页

作者： LIM Reyna k.v. Department of Chemistry State University of New York at Buffalo

The development of genetically encoded,wavelength-tunable fluorescent proteins has provided a powerful imaging tool to the study of protein dynamics and functions in cellular and organismal ***,many biological functions are not directly encoded in the protein primary sequence,e.g.,dynamic regulation afforded by protein posttranslational modifications such as *** meet this challenge,an emerging field of bioorthogonal chemistry has promised to offer a versatile strategy to selectively label a biomolecule of interest and track their dynamic regulations in its native *** strategy has been successfully applied to the studies of all classes of biomolecules in living systems,including proteins,nucleic acids,carbohydrates,and *** the incorporation of a bioorthogonal reporter site-selectively into a biomolecule through either genetic or metabolic approaches has been well established,the development of bioorthogonal reactions that allow fast ligation of exogenous chemical probes with the bioorthogonal reporter in living systems remains in its early ***,we review the recent development of bioorthogonal reactions and their applications in various biological systems,with a detailed discussion about our own work―the development of the tetrazole-based,photoinducible 1,3-dipolar cycloaddition reaction.

关键词： bioorthogonal reaction proteins biotechnology 1 3-dipolar cycloaddition click chemistry tetrazole

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Microstructure and mechanical properties of friction welded carbon steel(EN24) and nickel-based superalloy(IN718)

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International Journal of Minerals,Metallurgy and Materials 2021年第1期28卷 111-119页

作者： v.T.Gaikwad M.k.Mishra v.D.Hiwarkar R.k.P.Singh kalyani Centre for Technology and Innovation Bharat Forge LimitedPune 411036India Department of Materials Engineering Defense Institute of Advance TechnologyPune 411025India

Continuous-drive rotary friction welding was performed to join cylindrical specimens of carbon steel(EN24) and nickel-based superalloy(IN718), and the microstructures of three distinct weld zones—the weld interface(WI)/thermo-mechanically affected zone(TMAZ),the heat-affected zone(HAZ), and the base metal—were *** joint was observed to be free of defects but featured uneven flash *** backscatter diffraction(EBSD) analysis showed substantial changes in high-angle grain boundaries, low-angle grain boundaries, and twin boundaries in the TMAZ and ***, significant refinement in grain size(2 –5 μm) was observed at the WI/TMAZ with reference to the base *** possible causes of these are *** microhardness profile across the welded joint shows variation in *** changes in hardness are ascribed to grain refinement, phase transformation, and the dissolution of strengthening *** tensile test results reveal that a joint efficiency of 100% can be achieved using this method.

关键词： friction welding dissimilar metals EN24 IN718 microstructure mechanical properties

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A novel approach to investigate effect of magnetic field on dynamic properties of natural rubber based isotropic thick magnetorheological elastomers in shear mode

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Journal of Central South University 2015年第7期22卷 2612-2619页

作者： Sriharsha Hegde katari kiran k v Gangadharan Department of Mechanical Engineering National Institute of Technology

The preparation of natural rubber based isotropic thick magnetorheological elastomers(MRE) was focused on by varying the percentage volume concentration of carbonyl iron powder and developing a test set up to test the dynamic properties. Effect of magnetic field on the damping ratio was studied on the amplification region of the transmissibility curve. The viscoelastic dynamic damping nature of the elastomer was also studied by analyzing the force-displacement hysteresis graphs. The results show that MR effect increases with the increase in magnetic field as well as carbonyl iron powder particle concentration. It is observed that softer matrix material produces more MR effect. A maximum of 125% improvement in the loss factor is observed for the MRE with 25% carbonyl iron volume concentration. FEMM simulation shows that as carbonyl iron particle distribution becomes denser, MR effect is improved. FEMM analysis also reveals that if the distance between the adjacent iron particles are reduced from 20 μm to 10 μm, a 40% increase in stored energy is observed.

关键词： magnetorheological elastomer natural rubber carbonyl iron powder(CIP) dynamic analysis

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Comparison of RSM with ANN in predicting tensile strength of friction stir welded AA7039 aluminium alloy joints

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中国有色金属学会会刊：英文版 2009年第1期19卷 9-18页

作者： A. k. LAkSHMINARAYANAN v. BALASUBRAMANIAN Centre for Materials Joining ＆ Research （CEMAJOR） Department of Manufacturing Engineering Annamalai University Annamalai Nagar-608 002 Tamil Nadu India

磨擦搅动(FSW ) 焊接是一种创新稳固的州的加入技术并且在太空，栏杆，为加入铝的汽车、海洋的工业，镁，锌和铜被采用了合金。FSW 过程参数象工具那样旋转速度，焊接速度，轴的力量，在决定焊接质量起一个主要作用。二个方法，反应表... 详细信息

磨擦搅动(FSW ) 焊接是一种创新稳固的州的加入技术并且在太空，栏杆，为加入铝的汽车、海洋的工业，镁，锌和铜被采用了合金。FSW 过程参数象工具那样旋转速度，焊接速度，轴的力量，在决定焊接质量起一个主要作用。二个方法，反应表面方法论和人工的神经网络被用来预言磨擦的张力的强度搅动焊接 AA7039 铝合金。实验基于三个因素被进行，三水平、中央的合成的脸与完整的复制技术集中了设计，并且数学模型被开发。敏感分析被执行识别批评参数。通过反应表面方法论获得的结果与通过人工的神经网络的那些相比。

关键词：搅拌摩擦焊铜铝合金 AA7039 拉伸性能

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