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Numerical analysis of thermal fluid transport behavior during electron beam welding of 2219 aluminum alloy plate 被引量:6
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作者 Cheng-cai LIU Jing-shan HE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第6期1319-1326,共8页
A two-dimensional mathematical model based on volume-of-fluid method is proposed to investigate the heat transfer,fluidflow and keyhole dynamics during electron beam welding(EBW)on20mm-thick2219aluminum alloy plate.In... A two-dimensional mathematical model based on volume-of-fluid method is proposed to investigate the heat transfer,fluidflow and keyhole dynamics during electron beam welding(EBW)on20mm-thick2219aluminum alloy plate.In the model,anadaptive heat source model tracking keyhole depth is employed to simulate the heating process of electron beam.Heat and masstransport of different vortexes induced by surface tension,thermo-capillary force,recoil pressure,hydrostatic pressure and thermalbuoyancy is coupled with keyhole evolution.A series of physical phenomena involving keyhole drilling,collapse,reopening,quasi-stability,backfilling and the coupled thermal field are analyzed systematically.The results indicate that the decreased heat fluxof beam in depth can decelerate the keyholing velocity of recoil pressure and promote the quasi-steady state.Before and close to thisstate,the keyhole collapses and complicates the fluid transport of vortexes.Finally,all simulation results are validated againstexperiments. 展开更多
关键词 heat transfer fluid flow keyhole dynamics electron beam welding mass transport VORTEX recoil pressure BACKFILLING
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A Kind of Three-Mode Entangled States of Continuum Variables Generated by Beam Splitter and Parametric Down-Conversion Amplifier
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作者 JIANGNian-Quan FANHong-Yi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第2期208-212,共5页
In 3-mode Fock space we find a new tripartite entangled state |α,γ 】 λ,which make up a new quantum mechanical representation. The state |α,γ 】 λ, can be generated byusing the setup composing of a beam splitter... In 3-mode Fock space we find a new tripartite entangled state |α,γ 】 λ,which make up a new quantum mechanical representation. The state |α,γ 】 λ, can be generated byusing the setup composing of a beam splitter and a parametric down-conversion amplifier. Applicationof the state is briefly discussed. 展开更多
关键词 tripartite entangled state beam splitter parametric down-conversionamplifier
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Photorheology and rheokinetics of CTAB/chlorocinnamic acid micelles
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作者 方波 吕婷阳 +4 位作者 王进爽 何良好 卢海伟 郁丽程 陈洁 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第10期1640-1646,共7页
The photosensitive micellar system with prospect in drag reduction and heat transfer enhancement has been the research focus of science and industry.In this paper,a new type of photosensitive micellar system formed by... The photosensitive micellar system with prospect in drag reduction and heat transfer enhancement has been the research focus of science and industry.In this paper,a new type of photosensitive micellar system formed by cetyl trimethylammonium bromide(CTAB) and trans-chlorocinnamic acid(trans-CICA) was investigated.The effects of counter-ion concentration,surfactant concentration,UV irradiation time,and the position of substituent groups of counter-ion on photorheological properties were discussed.The results indicate that after UV irradiation the relative viscosity and thixotropy of micellar systems reduce obviously.At the same time,the relative viscosity of micelle systems and concentration of trans-CICA decline during UV irradiation time.The flow curves of micellar solutions before and after UV irradiation could be described by non-linear co-rotational Jeffreys model correctly.The rheokinetic equation was firstly established to describe the relationship between relative viscosity of micelle systems and conversion of trans-CICA. 展开更多
关键词 Photosensitive micellar system Cetyl trimethylammonium bromide trans-chlorocinnamic acid Rheokinetic equation Photorheological property
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Current Oscillation and dc-Voltage-Controlled Chaotic Dynamics in Semiconductor Superlattices
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作者 WANG Chang LU Jing-Tao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第2期363-368,共6页
We report a detailed theoretical study of current oscillation and de-voltage-controlled chaotic dynamics in doped GaAs/AlAs resonant tunneling superlattices under crossed electric and magnetic fields. When the superla... We report a detailed theoretical study of current oscillation and de-voltage-controlled chaotic dynamics in doped GaAs/AlAs resonant tunneling superlattices under crossed electric and magnetic fields. When the superlattice is biased at the negative differential velocity region, current self-oscillation is observed with proper doping concentration. The current oscillation mode and oscillation frequency can be affected by the dc voltage bias, doping density, and magnetic field. When an ac electric field with fixed amplitude and frequency is also applied to the system, different nonlinear properties show up in the external circuit with the change of dc voltage bias. We carefully study these nonlinear properties with different chaos-detecting methods. 展开更多
关键词 semiconductor superlattices current oscillation chaotic dynamics
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10MeV LIA电子束传输和聚焦的数值计算
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作者 胡熙静 刘桂贤 《爆轰波与冲击波》 1994年第2期6-17,共12页
关键词 加速器 束流力学 聚焦 电子束
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Numerical Simulation of 2-D Radiation-Drive Ignition Implosion Process 被引量:6
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作者 勇珩 宋鹏 +5 位作者 翟传磊 康洞国 谷建法 杭旭登 古培俊 江松 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第6期737-744,共8页
A Lagrangian compatible radiation hydrodynamic algorithm and the nuclear dynamics computing module are developed and implemented in the LARED Integration code, which is a radiation hydrodynamic code based on the 2-D c... A Lagrangian compatible radiation hydrodynamic algorithm and the nuclear dynamics computing module are developed and implemented in the LARED Integration code, which is a radiation hydrodynamic code based on the 2-D cylindrical coordinates for the numerical simulation of the indirect-drive Inertial Confined Fusion. A number of 1-D and 2-D ignition implosion numerical simulations by using the improved LARED Integration code (ILARED) are presented which show that the 1-D numerical results are consistent with those computed by the 1-D radiation hydrodynamic code RDMG, while the simulation results of the 2-D low-mode radiative asymmetry and hydrodynamic instability growth,according to the physical analysis and anticipation, are satisfactory. The capsules driven by the sources from SGII experiments are also simulated by ILARED, and the fuel shapes agree well with the experimental results. The numerical simulations demonstrate that ILARED can be used in the simulation of the 1-D and 2-D ignition capsule implosion using the multi-group diffusion model for radiation. 展开更多
关键词 LARED Integration code ignition implosion capsule spherical symmetry Lagrangian compatibleradiation hydrodynamic algorithm
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A Theoretical Model to Explain the Mechanism of Electromagnetic Wave Propagation Along Cylindrical Micelles
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作者 Afshin Moradi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第7期136-138,共3页
A theoretical model to explain the mechanism of the electromagnetic wave propagation in the quasi two-dimensional layer of counterions adjacent to the surface of a charged cylindrical membrane is presented. By using M... A theoretical model to explain the mechanism of the electromagnetic wave propagation in the quasi two-dimensional layer of counterions adjacent to the surface of a charged cylindrical membrane is presented. By using Maxwell and hydrodynamic equations with appropriate boundary conditions, general expression of dispersion relation is obtained for the electromagnetic wave with mixed TE and TM modes. 展开更多
关键词 MICELLE electromagnetic wave dispersion relation
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