可以看出,对于电流而言,离子的质量传递(mass transfer)才是其本质。在本体溶液中,主要是迁移电流。在电极表面同时存在扩散电流和迁移电流。电解质承担了迁移电流的大部分,消除了迁移对于电化学活性物质传质的影响,简化了其传质方程的数学处理,也同时降低了溶液电阻。 今天的内容到此为止,欢迎一起探讨。
mass transfermolecular diffusiondriving forcetemperature gradiantenergy equationsSummary This chapter includes the following topics: Introduction Fick's First Law; Mass Flux; Equation of Continuity of Species Steady-State Molecular Diffusion in Binary Systems Unsteady-State Molecular Diffusion Multicomponent ...
化工原理 Principles of Chemical Industry Principles of Diffusion and Mass Transfer Between Phases 1.THEORY OF DIFFUSION ? Diffusion is the movement, under the influence of a physical stimulus, of an individual component through a mixture ? The most common cause of diffusion is a concentration ...
纠结的mass-transfer corrected Tafel plots图氧还原催化剂相关的文献中有这么个图,“The Tafel plots were obtained after the measured currents were corrected for diffusion to give the kinetic currents in the mixed activation–diffusion region, calculated from the equation: j k = [j/(jd-j)], where...
Axisymmetric turbulent mass transfer in a circular tube Solutions of the diffusion equation are obtained for mass transfer in a fully developed turbulent flow in a plain circular tube in two axisymmetric situations. The cases studied are a point source positioned at the centre of the tube and......
被引量: 8发表: 1974年 Heat transfer operations Chapter 24continuity equation22 Mass transfer Convective-diffusion equation; boundary conditions Chapter 2523 Diffusion Example – diffusion through a stagnant film... NP Cheremisinoff,RLP Adams - Gulf Pub. Co. 被引量: 1发表: 1986年 加载更多来源...
A statistical theory for mass transfer near fluid—fluid and solid—fluid planar interfaces is developed using the method of projection operators applied to the convective—diffusion equation. A first order smoothing approximation gives a closed integro-differential equation for the mean concentration; a...
3FundamentalsofHeatandMassTransfer,6e 4.1Alternativeapproaches •Linesofconstanttemperature(isotherms等温线) •Heatflowlines(热流线): •representthedirectionofheatfluxvector •noheatconductionacrossheatflowlines Twothingstodoinconductioncases 1T(x,y)Heatdiffusionequation 2heatflux(x,y)Fourier’slaw Methods...
Chapter 3. Governing Equations of Mass Transfer 来自 Wiley 喜欢 0 阅读量: 26 作者: K Asano 摘要: Summary This chapter contains sections titled: Laminar and Turbulent Flow Continuity Equation and Diffusion Equation Continuity Equation Diffusion Equation in Terms of Mass Fraction Diffusion Equation in ...
The renewal models used by several authors for representing the turbulent process in the vicinity of a boundary give only the dependence of the transfer coefficient on the diffusion coefficient or thermal diffusivity. In this paper a number of ways are suggested by means of which this partial info...