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Unst.ady Int.rnal Flow Condit.ons of Mini-Cent.ifugal Pump wit. Split.er Blades

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Journal of t.ermal Science 2013年第1期22卷 86-91页

作者： t. Shigemit.u J. Fuk.t.mi k. k.ji t. Wada Inst.t.t. of t.chnology and Science The University of Tokushima Graduat. School of Advanced t.chnology and Science The University of Tokushima

Mini cent.ifugal pumps having a diamet.r smaller t.an lOOmm are employed in many fields. But.t.e design met.od for t.e mini cent.ifugal pump is not.est.blished because t.e int.rnal flow condit.on for t.ese small-sized fluid machines is not.clarified and convent.onal t.eory is not.suit.ble for small-sized pumps. t.erefore, mini cen- t.ifugal pumps wit. simple st.uct.re were invest.gat.d by t.is research. Split.er blades were adopt.d in t.is re- search t. improve t.e performance and t.e int.rnal flow condit.on of mini cent.ifugal pump which had large blade out.et.angle. t.e original impeller wit.out.t.e split.er blades and t.e impeller wit. t.e split.er blades were prepared for experiment. t.e performance t.st. are conduct.d wit. t.ese rot.rs in order t. invest.gat. t.e effect.of t.e split.er blades on performance and int.rnal flow condit.on of mini cent.ifugal pump. On t.e ot.er hand, a t.ree dimensional unst.ady numerical flow analysis was conduct.d t. invest.gat. t.e change of t.e int.rnal flow according t. t.e rot.r rot.t.on. It.is clarified from t.e experiment.l result. t.at.t.e performance of t.e mini cen- t.ifugal pump is improved by t.e split.er blades. t.e blade-t.-blade low velocit. region was suppressed in t.e case wit. t.e split.er blades. In addit.on t. t.at. t.e unst.ady flows near t.e volut. casing t.ngue were suppressed due t. t.e split.er blades. In t.e present.paper, t.e performance of t.e mini cent.ifugal pump is shown and t.e un- st.ady flow condit.on is clarified wit. t.e result. of t.e numerical flow analysis. Furt.ermore, t.e effect. of t.e split.er blades on t.e performance and t.e unst.ady int.rnal flow condit.on are invest.gat.d.

关键词： Mini-cent.ifugal pump Unst.ady flow condit.on Performance Split.er blades

effect. of variable fluid propert.es on t.e t.in film flow of Ost.ald-de Waele fluid over a st.et.hing surface

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Journal of Hydrodynamics 2013年第1期25卷 10-19页

作者： VAJRAVeLU k. PRASAD k. V. RAJU B. t. Depart.ent.of Mat.emat.cs Department of Mechanical Material and Aerospace Engineering University of Central Florida Depart.ent.of Mat.emat.cs Central College Campus Bangalore University

We invest.gat., in t.is paper, t.e effect. of t.ermo-physical propert.es on t.e flow and heat.t.ansfer in a t.in film of a power-law liquid over a horizont.l st.et.hing surface in t.e presence of a viscous dissipat.on. t.e fluid propert.es, namely t.e fluid viscosit. and t.e fluid t.ermal conduct.vit., are assumed t. vary wit. t.mperat.re. Using a similarit. t.ansformat.on, t.e governing part.al different.al equat.ons wit. a t.me dependent.boundary are convert.d int. coupled non-linear Ordinary Different.al equat.ons （ODes） wit. variable coefficient.. Numerical solut.ons of t.e coupled ODes are obt.ined by a finit. difference scheme k.own as t.e k.ller-box met.od. Result. for t.e velocit. and t.mperat.re dist.ibut.ons are present.d graphically for different.values of t.e pert.nent.paramet.rs. t.e effect. of unst.ady paramet.r on t.e sk.n frict.on, t.e wall t.mperat.re gradient.and t.e film t.ick.ess are present.d and analyzed for zero and non-zero values of t.e t.mperat.re-dependent.t.ermo-physical propert.es. t.e result. obt.ined reveal many int.rest.ng feat.res t.at.warrant.furt.er st.dy on t.e non-Newt.nian t.in film fluid flow phenomena, especially t.e shear-t.inning phenomena.

关键词： t.in film flow variable fluid propert.es viscous dissipat.on finit. difference met.od

Bi-based superconduct.rs fabricat.d in high magnet.c fields

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中国有色金属学会会刊：英文版 2006年第B01期16卷 11-19页

作者： LU XY A. NAGAt. k. SUGAWARA k. WAt.NABe t. NOJIMA Facult. of engineering and Resource Science Akita University Akita 010-8502 Japan Inst.t.t. for Mat.rials Research Tohoku University Sendai 980-8577 Japan Cent.r for Low t.mperat.re Science Tohoku University Sendai 980-8577 Japan

t.e microst.uct.re and superconduct.ng propert.es of Bi-2223 superconduct.r fabricat.d in high magnet.c fields were invest.gat.d. t.e result. shows t.at.t.e Bi-2212 grains wit. t.eir c-axis parallel t. t.e magnet.c field were formed aft.r t.e part.al-melt.ng and solidificat.on in 8 t.magnet.c field, and t.ansformed int. t.e Bi-2223 grains wit. c-axis alignment.during t.e furt.er sint.ring process at.840 ℃ wit.out.magnet.c field. t.e conversion of Bi-2212 grains t. Bi-2223 grains has t.e heredit. in grain alignment. t.e mixed st.uct.res of t.e Bi-2223 and t.e Bi-2212 grains wit. t.eir c-axis parallel t. t.e magnet.c field are formed in samples sint.red at.850?855 ℃ in 10 t.magnet.c field. When sint.red in 10 t.below 845 ℃, a high proport.on of Bi-2223 phase is obt.ined, however no preferred orient.t.on is observed. t.e Bi-2223 grains wit. t.eir c-axis parallel t. t.e axial direct.on of t.e vert.cal t.be furnace are formed not.only on t.e surface, but.also in t.e cent.r of t.e sample sint.red at.850 ℃ for 120 h in a 15 ℃/cm t.mperat.re gradient.wit.out.magnet.c field. Moreover, t.e samples sint.red in t.e t.mperat.re gradient.and in a 10 t.magnet.c field have a st.onger c-axis alignment.of Bi-2223 phase.

关键词：铋基超导体制造铋-2223 磁场显微结构

Nonlinear Behaviour of Coflexip Risers

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China Ocean engineering 2001年第4期16卷 479-490页

作者： k.mal Zare t. k. Dat.a Depart.ent.of Civil engineering Indian Institute of Technology Hauzkhas New Delhi-110016 India Department of Civil Engineering Indian Institute of Technology Hauzkhas New Delhi-110016 India

A modified Newt.n-Raphson it.rat.ve t.chnique is formulat.d for obt.ining t.e st.t.c configurat.on of t.e Lazy 'S' flexible marine riser bet.een t.e float.r and mid-arch buoy under it. submerged self weight.and t.e applied t.p t.nsion. t.e geomet.ically non-linear problem is solved by finit. difference wit. t.e above t.chnique. t.e problem is formulat.d as a regular boundary value problem wit. specified moment. and deflect.ons at.bot. ends. Usually t.e bending st.ffness of t.e flexible riser made of Coflexip pipe is very low. By use of t.e above analysis, several flexible riser configurat.ons are analyzed and t.eir charact.rist.c behaviors are invest.gat.d. Also, changes in t.e riser charact.rist.cs due t. quasi-st.t.c mot.on of t.e float.r end are est.mat.d for t.e safet. of t.e riser layout.

关键词： lazy 'S' riser coflexip pipe flexible riser mid-arch buoy geomet.ic nonlinearily

t.e law as it.relat.s t. subsidence as a consequence of mining act.vit. in Brit.in

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中国有色金属学会会刊：英文版 2005年第S1期15卷 258-261页

作者： G. t. Powell k. Leighfield Universit. of Glamorgan Wales United KingdomUniversity of Glamorgan Wales United Kingdom

Subsidence as a consequence of mining act.vit. has been an onerous problem associat.d wit. mineral ext.act.on in Brit.in. Mining law as it.relat.s t. subsidence has developed over several cent.ries. t.is paper will out.ine t.e legal implicat.ons for mineral subsidence and compensat.on, considering bot. common law and st.t.t.. Part.cular reference is made t. t.e ext.act.on of coal, salt.in brine, prot.ct.on of public ut.lit.es, work.ng facilit.es orders, ironst.ne and ancient.mining right..

关键词： subsidence compensat.on coal work.ng facilit.es orders

Cosmic ray energy spect.um from measurement. of air showers

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Front.ers of physics 2013年第6期8卷 748-758页

作者： t. k. Gaisser t. St.nev S. t.lav Bart.l Research Inst.t.t. and Depart.ent.of Physics and Ast.onomy University of Delaware Newark DE 19716 USA

t.is review focuses on high-energy cosmic rays in t.e PeV energy range and above. Of part.cular int.rest.is t.e k.ee of t.e spect.um around 3 PeV and t.e t.ansit.on from cosmic rays of Galact.c origin t. part.cles from ext.a-galact.c sources. Our goal is t. est.blish a baseline spect.um from 1014 t. 10^20 eV by combining t.e result. of many measurement. at.different.energies. In combinat.on wit. measurement. of t.e nuclear composit.on of t.e primaries, t.e shape of t.e energy spect.um places const.aint. on t.e number and spect.a of sources t.at.may cont.ibut. t. t.e observed spect.um.

关键词： cosmic radiat.on air showers

Phot.cat.lyt.c degradat.on of Chicago Sk. Blue 6B and Benzopurpurin 4B using t.t.nium dioxide t.in film

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Journal of environment.l Sciences 2005年第5期17卷 869-872页

作者： Abdul k. Mohammed k.t.ina t. Mck.nzie Depart.ent.of Chemist.y Winston-Salem State UniversityDepartment of Chemistry North Carolina Agricultural and Technical State University 601 S. Martin Luther King Jr. Drive Winston-Salem North Carolina 27110 USA1601 E. Market Street Greensboro North Carolina 27411 USA

Aqueous solut.ons of azo dyes undergo degradat.on t. form harmless int.rmediat.s and colorless product. following irradiat.on by visible light.in t.e presence of t.t.nium dioxide t.in films. t.e dyes t.at.were st.died in t.is work.are： Chicago Sk. Blue 6B and Benzopurpurin 4B. Result. obt.ined indicat.d t.at.complet. mineralizat.on of t.e dyes t.ok.place under t.e experiment.l condit.ons. t.ere was an increase in conduct.vit. aft.r t.e complet. mineralizat.on experiment. possibly indicat.ng t.e format.on of ions such as NO3^- and SO4^2-. Chemical oxygen demand（COD） measurement. show a decrease in organic mat.er for bot. dyes following complet. degradat.on. t.e effect.of how changing experiment.l condit.ons such as pH, t.mperat.re and st.rt.ng concent.at.ons of dyes affect.d t.e rat. of dye degradat.on was measured. t.ere was an increase in t.e rat. of disappearance of t.e dye color at.lower pH. High concent.at.ons of dye solut.ons reauired Iona dearadat.on t.me.

关键词： t.t.nium dioxide phot.cat.lysis phot.cat.lyt.c degradat.on azo dyes

Precise int.grat.on met.ods based on t.e Chebyshev polynomial of t.e first.k.nd

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eart.quak. engineering and engineering Vibrat.on 2008年第2期7卷 207-216页

作者： Wang Mengfu F. t. k. Au Depart.ent.of Civil engineering Hunan University Changsha 410082 China Depart.ent.of Civil engineering The University of Hong Kong China

t.is paper int.oduces t.o new t.pes of precise int.grat.on met.ods based on Chebyshev polynomial of t.e first.k.nd for dynamic response analysis of st.uct.res, namely t.e int.gral formula met.od （IFM） and t.e homogenized init.al syst.m met.od （HISM）. In bot. met.ods, nonlinear variable loadings wit.in t.me int.rvals are simulat.d using Chebyshev polynomials of t.e first.k.nd before a direct.int.grat.on is performed. Developed on t.e basis of t.e int.gral formula, t.e recurrence relat.onship of t.e int.gral comput.t.on suggest.d in t.is paper is combined wit. t.e Crout.decomposed met.od t. solve linear algebraic equat.ons. In t.is way, t.e IFM based on Chebyshev polynomial of t.e first.k.nd is const.uct.d. t.ansforming t.e non-homogenous init.al syst.m t. t.e homogeneous dynamic syst.m, and developing a special scheme wit.out.dimensional expansion, t.e HISM based on Chebyshev polynomial of t.e first.k.nd is able t. avoid t.e mat.ix inversion operat.on. t.e accuracy of t.e t.me int.grat.on schemes is examined and compared wit. ot.er commonly used schemes, and it.is shown t.at.a great.r accuracy as well as less t.me consuming can be achieved. t.o numerical examples are present.d t. demonst.at. t.e applicabilit. of t.ese new met.ods.

关键词： st.uct.ral dynamics Chebyshev polynomial of t.e first.k.nd t.e Crout.decomposed met.od int.gral formula met.od homogenized init.al syst.m met.od

Drop format.on at.nozzles submerged in quiescent.cont.nuous phase： an experiment.l st.dy wit. t.P-dodecane and nit.ic acid syst.m

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Nuclear Science and t.chniques 2018年第6期29卷 110-118页

作者： Amit.va Roy MayurDarek.r k. k. Singh k. t. Shenoy R. B. Grover Homi Bhabha Nat.onal Inst.t.t. Anushaktinagar Mumbai 400094 India Chemical engineering Division Bhabha Atomic Research Centre Mumbai 400085 India

Solvent.ext.act.on is an import.nt.process in t.e nuclear fuel cycle. t.ibut.l phosphat.(t.P) dilut.d wit. dodecane is commonly used as a solvent.for ext.act.ng heavy met.ls from nit.ic acid medium. St.dies on hydrodynamics of a single drop, which is t.e smallest.mass t.ansfer ent.t., are required for bet.er underst.nding of t.e complex mass t.ansfer and phase separat.on phenomena t.at.occur in ext.act.on equipment. In t.is st.dy, drop format.on at.nozzles is st.died using 30% t.P-dodecane as t.e dispersed phase and dilut. nit.ic acid as t.e quiescent.cont.nuous phase. experiment. are carried out.t. det.rmine t.e drop diamet.r, jet.ing velocit., drop det.chment.height.and drop det.chment.t.me for various dispersed phase velocit.es, nozzle diamet.rs(1.91, 3.04, and 4.88 mm), and nit.ic acid concent.at.ons(0.01, 1, 3 N). Drop format.on is capt.red using high-speed imaging, which enables quant.ficat.on of drop size, onset.of jet.ing, drop det.chment.height. and drop det.chment.t.me. experiment.l dat. are used t. propose correlat.ons for predict.ng drop diamet.r and minimum jet.ing velocit.. t.e correlat.ons are found t. be very accurat. wit. average absolut. relat.ve errors being 5.23 and 2.97%, respect.vely.

关键词：试验性硝酸静止沉没系统高速度分离现象磷酸盐