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The stud. of key d.sign parameters effects on the vortex tube performance

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Journal of Thermal Science 2009年第4期18卷 370-376页

作者： Mohammad.Ameri Behrooz behnia Energy Engineering d.partment Power & Water University of Technology

In this paper, energy separation effect in a vortex tube has been investigated.using a CFd.mod.l. Thenumerical simulation has been d.ne d.e to the complex structure of flow. The governing equationshave been solved.by FLUENT cod. in 2d.and.3d.compressible and.turbulent mod.l. The effects ofgeometrical and.thermo-physical parameters have been investigated. The results have shown that theoptimum length to d.ameter ratio is from 25 to 35. Increasing the number of nozzles from 2 to 4 withconvergent shape is found.to be an efficient configuration for the swirl generator. The optimum valueof orifice d.ameter to tube d.ameter ratio, for the maximum cold.air temperature d.fference and.efficiency,has been d.termined.to be around.0.58. The results show that if the inlet pressure increases upto a critical value, the efficiency will increase. Nevertheless, if it increases to higher values, the efficiencywill d.crease. Moreover, it is found.out that increasing the cold.fraction d.creases the cold.emperature d.fference and.efficiency.

关键词： Vortex tube Energy separation Efficiency Swirl generator

Multifractal spectrum and.spectral behavior of calcium and.titanium isotopes based.on nuclear shell mod.l

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Chinese Physics C 2019年第11期43卷 130-133页

作者： V.razazi S.behnia J.ziaei d.partment of Physics Urmia Branch Islamic Azad UniversityUrmiaIran d.partment of Physics Urmia University of TechnologyUrmiaIran Young Researchers and.Elite Club Urmia Branch Islamic Azad UniversityUrmiaIran

We investigate the effect of valence space nucleons on the multifractal analysis(MFA)and.spectral analysis of calcium and.titanium *** multifractality of wavefunctions is characterized.by its associated.singularity spectrum f(α)and.generalized.d.mension *** rand.m matrix theory(RMT)has been employed.in the stud. of properties of the d.stribution of energy *** particular,we find.that the number of nucleons and.two-bod. resid.al interactions particularly affect the singularity and.energy level spectra.

关键词： two-bod. resid.al interaction nuclear shell mod.l rand.m matrix theory nearest neighbor d.stribution multifractal spectrum

Purity-d.pend.nt Lorenz number,electron hyd.od.namics and.electron-phonon coupling in WTe_(2)

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 153-158页

作者： Wei Xie Feng Yang Liangcai Xu Xiaokang Li Zengwei Zhu Kamran behnia Wuhan National High Magnetic Field.Center and.School of Physics Huazhong University of Science and TechnologyWuhan 430074China Laboratoire d. Physique et d.Etud. d.s Matériaux(ESPCI-CNRS-Sorbonne Université)PSL University Paris 75005France

We present a stud. of electrical and.thermal transport in Weyl semimetal WTe_(2)d.wn to 0.3 *** Wied.mann-Franz law hold. below 2 K and.a d.wnward.d.viation starts *** d.viation is more pronounced.in cleaner samples,as expected.in the hyd.od.namic picture of electronic transport,where a fraction of electron-electron collisions conserve *** are the d.minant heat carriers and.their mean-free-path d.es not d.splay a Knud.en *** is presumably a consequence of weak anharmonicity,as ind.cated.by the temperature d.pend.nce of the specific *** momentum exchange between phonons and.electrons lead. to quantum oscillations of the phononic thermal ***-Grüneisen picture of electron-phonon scattering breaks d.wn at low temperature when Umklapp ph-ph collisions cease to be a sink for electronic flow of *** with semi-metallic Sb shows that normal ph-ph collisions are amplified.by *** both semimetals,at cryogenic temperature,e-ph collisions d.grad. the phononic flow of energy but not the electronic flow of momentum.

关键词： thermal cond.ctivity Wied.mann-Franz law electron hyd.od.namics electron-phonon coupling