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镍纳米线电极对乙醇的电催化氧化动力学参数的测定 被引量:12
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作者 孔景临 薛宽宏 +2 位作者 邵颖 何春建 陈巧玲 《物理化学学报》 SCIE CAS CSCD 北大核心 2002年第3期268-271,共4页
循环伏安实验表明,以多孔氧化铝膜为模板制备出的镍纳米线电极对乙醇的电化学催化氧化具有很高的催化活性.用强制对流流体动力学的方法求算出乙醇在镍纳米线电极上的电子传递过程的速率常数高于许多文献报导值,而电子传递过程的随后步... 循环伏安实验表明,以多孔氧化铝膜为模板制备出的镍纳米线电极对乙醇的电化学催化氧化具有很高的催化活性.用强制对流流体动力学的方法求算出乙醇在镍纳米线电极上的电子传递过程的速率常数高于许多文献报导值,而电子传递过程的随后步骤的速率常数相近. 展开更多
关键词 镍纳米线电极 乙醇 循环伏安 强制对流流体动力学 催化活性 电子传递 有机电合成 电催化氧化 速率常数
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Numerical Study of Forced Convection Lid-Driven Cavity Flows Using LES (Large Eddy Simulation)
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作者 Elizaldo D. dos Santos Adriane P. Petry +1 位作者 Luiz A.O. Rocha Francis H.R. Franqa 《Journal of Energy and Power Engineering》 2013年第9期1669-1680,共12页
This study presents the LES (large eddy simulation) of forced convection in laminar and two dimensional turbulent flows when the flow reaches the steady state. The main purpose is the evaluation of a developed numer... This study presents the LES (large eddy simulation) of forced convection in laminar and two dimensional turbulent flows when the flow reaches the steady state. The main purpose is the evaluation of a developed numerical methodology for the simulation of forced convection flows at various Reynolds numbers (100 _〈 Rex 〈_ 10,000) and for a fixed Prandtl number (Pr = 1.0). The hexahedral eight-node FEM (finite element method) with an explicit Taylor-Galerkin scheme is used to obtain the numerical solutions of the conservation equations of mass, momentum and energy. The Smagorinsky model is employed for the sub-grid treatment. The time-averaged velocity and temperature profiles are compared with results of literature and a CFD (computational fluid dynamics) package based on finite volume method, leading to a highest deviation of nearly 6%. Moreover, characteristics of the forced convection flows are properly obtained, e.g., the effect of the Reynolds number over the multiplicity of scales. 展开更多
关键词 LES FEM forced convection driven cavity energy equation.
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Laminar Forced Convection from a Rotating Horizontal Cylinder in Cross Flow
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作者 Prabul Chandran G.Venugopal +1 位作者 H.Abdul Jaleel M.R.Rajkumar 《Journal of Thermal Science》 SCIE EI CAS CSCD 2017年第2期153-159,共7页
The influence of non-dimensional rotational velocity, flow Reynolds number and Prandtl number of the fluid on laminar forced convection from a rotating horizontal cylinder subject to constant heat flux boundary condit... The influence of non-dimensional rotational velocity, flow Reynolds number and Prandtl number of the fluid on laminar forced convection from a rotating horizontal cylinder subject to constant heat flux boundary condition is numerically investigated. The numerical simulations have been conducted using commercial Computational Fluid Dynamics package CFX available in ANSYS Workbench 14. Results are presented for the non-dimensional rotational velocity α ranging from 0 to 4, flow Reynolds number from 25 to 40 and Prandtl number of the fluid from 0.7 to 5.4. The rotational effects results in reduction in heat transfer compared to heat transfer from stationary heated cylinder due to thickening of boundary layer as consequence of the rotation of the cylinder. Heat transfer rate increases with increase in Prandtl number of the fluid. 展开更多
关键词 Heated rotating cylinder Non-dimensional rotational velocity Flow Reynolds number Prandtl number
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