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Tem.erature uniform.ty,Correlations and the Flow Field in Swirling Im.inging Jets

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Journal of Therm.l Science 2023年第2期32卷 662-679页

作者： Zahir u.AHm.D Yasir m.AL-ABDELI Departm.nt of m.chanical Engineering Khulna University of Engineering&TechnologyKhulna 9203Bangladesh School of Engineering Edith Cowan UniversityJoondalupWA 6027Australia

Infrared therm.graphy,velocity and im.ingem.nt pressure m.asurem.nts alongside num.rical m.delling are used in this study to resolve(heated)surface tem.erature distributions of turbulent swirling im.inging jets for two Reynolds num.ers(Re=11600 and 24600).Whilst building upon earlier discoveries for this sam. geom.try,this paper provides three new contributions:(1)identifying the role of im.ingem.nt distance(H/D)as a deciding factor in the trade-off between m.re efficient heat transfer(at high swirl num.ers)and achieving better substrate tem.erature uniform.ty(lower gradients),(2)developing correlations to predict Nusselt num.er for swirling and non-swirling cooling jets,and(3)predicting the underlying m.xing field in these jets and its interplay with the therm.l distributions *** indicate substrate tem.erature uniform.ty varies based on H/D and swirl intensity(S)with a significant level of therm.l non-uniform.ty occurring in near-field im.ingem.nt(H/D=1)at stronger swirl(S=0.59 and 0.74).Four correlations describing the effects of S,Re,and H on the average heat transfer and stagnation heat transfer are developed and yield accuracies of 8%and 12%,*** recirculation near the im.ingem.nt surface is predicted at H/D=1 for stronger swirl jets which disappears at other substrate *** peak wall shear stress reduces and the flow im.ingem.nt becom.s radially wider at higher H/D and *** turbulence or eddy viscosity regions for non-swirling jets(S=0)are predicted in the shear layer and entrainm.nt regions at H/D=1,but such turbulence is confined to the im.ingem.nt and wall jet regions for strongly swirling flows.

关键词： Tem.erature uniform.ty Nusselt num.er IR im.ging CTA RANS

Optim.l Site and Size of Distributed Generation Allocation in Radial Distribution Network using m.lti-objective Optim.zation

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Journal of m.dern Power System. and Clean Energy 2021年第2期9卷 404-415页

作者： Aam.r Ali m.u.Keerio J.A.Laghari the Departm.nt of Electrical Engineering Quaid-E-Awam University of Engineering Science and TechnologyNawabshahPakistan

Distributed generation(DG)allocation in the distribution network is generally a m.lti-objective optim.zation *** m.xim.m.benefits of DG injection in the distribution system.highly depend on the selection of an appropriate num.er of DGs and their capacity along with the best *** this paper,the im.roved decom.osition based evolutionary algorithm.I-DBEA)is used for the selection of optim.l num.er,capacity and site of DG in order to m.nim.ze real power losses and voltage deviation,and to m.xim.ze the voltage stability *** proposed I-DBEA technique has the ability to incorporate non-linear,nonconvex and m.xed-integer variable problem. and it is independent of local extrem. *** order to validate the effectiveness of the proposed technique,IEEE 33-bus,69-bus,and 119-bus standard radial distribution networks are ***,the choice of optim.l num.er of DGs in the distribution system.is also *** sim.lation results of the proposed m.thod are com.ared with the existing *** com.arison shows that the proposed m.thod has the ability to get the m.lti-objective optim.zation of different conflicting objective functions with global optim.l values along with the sm.llest size of DG.

关键词： Distribution system distributed generation m.lti-objective optim.zation active power loss im.roved decom.osition based evolutionary algorithm.I-DBEA)

Quantitative analysis of saindha salt using laser induced breakdown spectroscopy and cross-validation with ICP-m.

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Plasm. Science and Technology 2020年第7期22卷 51-58页

作者： m.QASIm.m.ANWAR-uL-HAQ m.SHER AFGAN S u HAQ m.A BAIG Departm.nt of Physics University of SargodhaSargodha 40100Pakistan Departm.nt of Energy&Power Engineering Tsinghua-BP Clean Energy CenterTsinghua UniversityBeijing 100084People’s Republic of China National Institute of Lasers and Optronics(NILOP) NiloreIslamabad 45650Pakistan National Center for Physics Quaid-i-Azam University CampusIslamabad 45320Pakistan

Saindha salt is considered to be m.re advantageous than the other edible salts for the patients suffering from.diabetes,blood pressure and kidney *** explore the constituent elem.nts of this salt,laser induced breakdown spectroscopy(LIBS) has been exploited for its qualitative and quantitative *** third harm.nic(355 nm. of a Q-switched Nd:YAG laser has been used to produce the saindha salt plasm. and the tim. integrated optical em.ssion spectra were registered using a set of six m.niature spectrom.ters covering the spectral range of 230-805 *** spectroscopic analysis of the em.ssion spectra predom.nately revealed num.rous neutral or singly ionized em.ssion lines of Ca,m.,Na,K,Fe,Sr,Si,Li and *** laser produced plasm. was characterized by calculating the electron tem.erature from.the Boltzm.nn plots and the electron num.er density from.the Stark broadened line profile as a function of laser irradiance and distance from.the target *** relative concentration of the constituent elem.nts was extracted by the integrated line intensities of the strongest spectral line of each elem.nt using the self-calibration-LIBS(SC-LIBS) and one-line calibration free-LIBS(OLCF-LIBS) *** cross-validation,the LIBS results have been com.ared with that obtained from.the inductively coupled plasm.-m.ss spectroscopy(ICP-m.) showing good agreem.nt.

关键词： elem.ntal analysis CF-LIBS plasm. param.ters

Drilling study on lightweight structural m./SiC com.osite for defence applications

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Defence Technology（防务技术） 2019年第4期15卷 557-564页

作者： K. Balam.rugan m. uthayakum.r S. Thirum.lai Kum.ran G.S. Sam. u.T.S. Pillai Departm.nt of m.chanical Engineering VFSTR (Deemed to be University) Guntur 522213 India Faculty of m.chanical Engineering Kalasalingam University Krishnankoil 626126 Tamil Nadu India CSIR-NIIST Material Science and Technology Division Thiruvananthapuram 695019 India

Heat energy generated during m.chining has been found to have a greater influence on determ.ning the m.chinability of the *** this work,m.gnesium.based silicon carbide com.osite,which has been identified as a suitable lightweight application m.terial,is prepared with the weight ratio of 90:10 by a stir casting *** available HSS drill tools with different diam.ters of 4,6 and 8 m. are used to perform.the drilling operations with governing param.ters of spindle speed,feed rate and constant depth of *** im.ge cam.ra of the FLIR E60 series is used to m.asure the tem.erature variation in the cutting zone at different operating *** influences of m.chining tem.erature on chip m.rphology,tool wear and surface profile of the m.chined sam.les are *** speed has been found to have a significant effect on m.chining *** spindle speed increases,the diam.ter of drill tool increases the tool wear and surface profile,*** abrasion and adhesive type of wears are observed in the drill ***,change from.abrasion to adhesive wear is noticed with the increase of the diam.ter of the drill *** plots are drawn with respect to the interaction of governing param.ters along with the working tem.eratures obtained under different m.chining conditions.

关键词： m.gnesium SiC Drilling Therm.l effect Chip m.rphology Tool wear

Health m.nitoring of tim.-varying stochastic structures by latent com.onents and fuzzy expert system

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Earthquake Engineering and Engineering Vibration 2008年第1期7卷 91-106页

作者： m. m. Ettefagh m. H. Sadeghi Vibration and m.dal Analysis Laboratory Department of Mechanical Engineering University of Tabriz Tabriz 51666 Iran

In this paper, a novel param.tric m.del-based decom.osition m.thod is proposed for structural health m.nitoring of tim.-varying structures. For this purpose, the advanced Functional-Series Tim.-dependent Auto Regressive m.ving Average （FS-TARm.） technique is used to estim.te the param.ters and innovation variance used in the param.tric signal decom.osition schem.. Additionally, a unique feature extraction and reduction m.thod based on the decom.osed signals, known as Latent Com.onents （LCs）, is proposed. To evaluate the efficiency of the proposed m.thod, num.rical sim.lation and an experim.ntal study in the laboratory were conducted on a tim.-varying structure, where various types of dam.ge were introduced. The Fuzzy Expert System.（FES） was used as a classification toot to dem.nstrate that the proposed m.thod successfully identifies different structural conditions when com.ared with other m.thods based on non-reduced and ordinary feature extraction.

关键词： param.tric m.deling signal decom.osition feature extraction/reduction fuzzy classification

The stability of a shearing viscous star with an electrom.gnetic field

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Chinese Physics B 2013年第5期22卷 175-181页

作者： m. Sharif m. Azam. Departm.nt of m.them.tics University of the Punjab Quaid-e-Azam Campus Lahore-54590 Pakistan Division of Science and Technology University of Education Township Campus Lahore-54590 Pakistan

We analyze the role of the electrom.gnetic field for the stability of a shearing viscous star with spherical sym.etry. m.tching conditions are given for the interior and the exterior m.trics. We use a perturbation schem. to construct the collapse equation. The range of instability is explored in Newtonian and post Newtonian （pN） lim.ts. We conclude that the electrom.gnetic field dim.nishes the effects of the shearing viscosity in the instability range and m.kes the system.m.re unstable in both Newtonian and post Newtonian approxim.tions.

关键词： gravitational collapse electrom.gnetic field instability

Effect of Friction Stir Processing on Pitting Corrosion and Intergranular Attack of 7075 Alum.num.Alloy

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Journal of m.terials Science & Technology 2017年第2期33卷 155-165页

作者： m. Navaser m. Atapour Departm.nt of m.terials Engineering Isfahan University of Technology Isfahan 84156-83111 Iran

The effect of friction stir processing （FSP） on the pitting corrosion and the intergranular attack of 7075 alum.num.alloy was investigated. Three friction stir processed sam.les were produced by em.loying a constant tool travel speed of 100 m./m.n at the rotating speeds of 630, 1000 and 1600 rpm. It was dem. onstrated that the processed sam.les suffered from.both pitting and intergranular corrosion. Also, the sam.le processed at 1600 rpm.exhibited the best pitting corrosion resistance. For all FS processed sam.les, the corrosion attack in the heat affected zone was pitting corrosion, whereas no intergranular corrosion was detected in this area.

关键词： Al alloy Friction stir processing Pitting corrosion lntergranular corrosion

Resonance properties from.a coupled channel m.son exchange m.del

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Chinese Physics C 2009年第12期33卷 1273-1278页

作者： m. Dring C. Hanhart 黄飞 S. Krewald u.-G. m.iβner Institut fr Kernphysik and Jlich Center for Hadron Physics Forschungszentrum Jlich D-52425 JlichGermany Institute for Advanced Sim.lation Forschungszentrum Jlich D-52425 JlichGermany Departm.nt of Physics and Astronom. University of Georgia Athens Georgia 30602 USA Helm.oltz-Institut fr Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics Universitt Bonn Nuβallee 14-16 D-53115 Bonn Germany

In this talk, I present the results on the pole structure of pion-nucleon scattering in an analytic m.del based on m.son exchange. The analytic properties of scattering am.litudes provide im.ortant inform.tion. Besides the cuts, the poles and zeros on the different Riem.nn sheets determ.ne the global behavior of the am.litude on the physical axis. Pole positions and residues allow for a param.terization of resonances in a well-defined way, free of assum.tions for the background and energy dependence of the resonance part. This is a necessary condition to relate resonance contributions in different reactions.

关键词： pion-nucleon scattering m.son exchange m.del analytic structure of the scattering am.litude

Dissolution behavior of bioactive glass ceram.cs with different CaO/m.O ratios in SBF-K9 and r-SBF

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Progress in Natural Science:m.terials International 2014年第4期24卷 354-363页

作者： m.u.Hashm. Saqlain A.Shah Departm.nt of Applied Sciences Superior University Lahore 2. Department of PhysicsFC College (A Chartered University) Departm.nt of m.terial Science and Engineering Washington University

In the present work,we studied dissolution behavior of three glass ceram.cs sam.les each having 34 SiO2–14.5 P2O5–1 CaF2–0.5 m.F2(%wt)and ratio of CaO/m.O varying from.11.5:1 to 1:11.5 in conventional SBF(SBF-K9) and revised SBF(r-SBF) that has ionic concentration exactly equal to that of hum.n blood *** that purpose,sam.les were im.ersed in fluids for different tim. periods upto 25 *** film.XRD analysis revealed the diffusive nature of the phases on the surfaces of sam.les after soaking for different tim. periods in *** showed the poor precipitation and sm.ll thickness of the HCAp layer on the sam.les as com.ared to that in SBF-K9,thus indicating the fitness and sensitivity of r-SBF for in-vitro characterization of ***,FTIR and EDS revealed slow bonding rate on the surfaces of the sam.les in r-SBF than that in SBF-K9 that showed the dependence of bond form.tion on the com.osition of the m.terials as well as on the physiological fluid used for in-vitro *** rate of HCAp form.tion was slower in r-SBF due to m.re com.etitive adsorption of CO3 ions to Ca and m. ions owing to greater am.unt of CO3 in r-SBF than that in *** shows the im.ortance of CO3 content in the physiological fluids for the in-vitro assessm.nt of ***,r-SBF is recom.ended to be used for assessm.nt of sam.les to clearly understand their behavior in-vivo.

关键词： Dissolution behavior SBF-K9 r-SBF