电渗流中传热传质过程与熵的分析

发布时间：2018-10-31 15:56

【摘要】：在壁面存在恒定热通量条件下,分析微通道内电渗流中传热传质过程与熵的生成.建立数值计算模型,分别采用Poisson-Boltzmann方程、Navier-Stokes方程、Nernst-Planck方程和能量方程来描述微通道内双电层电势、流场、离子浓度和温度的分布情况.引入熵产生,进一步研究不同流动参数对流体传热过程的作用,讨论不同流动参数下各热效应的变化规律,并具体分析热效应参数对流体总熵增加及各部分热效应对总熵比重的影响.结果表明,动电参数与Joule(焦耳)热系数的增大会使得传热性能减弱,动电参数对传热性能影响更为明显;流体的总熵为动电参数、传质系数和质量弥散系数的增函数.
[Abstract]:Under the condition of constant heat flux on the wall, the heat and mass transfer process and entropy generation in electroosmotic flow in microchannels are analyzed. The Poisson-Boltzmann equation, Navier-Stokes equation, Nernst-Planck equation and energy equation were used to describe the distribution of potential, flow field, ion concentration and temperature in the microchannel. Entropy production is introduced to further study the effect of different flow parameters on the heat transfer process of the fluid, and to discuss the variation law of each heat effect under different flow parameters. The effect of the thermal effect parameters on the total entropy of the fluid and the effect of each part of the thermal effect on the specific gravity of the total entropy are analyzed in detail. The results show that the increase of the kinetic parameters and the Joule thermal coefficient will weaken the heat transfer performance, and the effect of the kinetic and electrical parameters on the heat transfer performance is more obvious, and the total entropy of the fluid is an increasing function of the dynamic electrical parameters, mass transfer coefficient and mass dispersion coefficient.
【作者单位】：南昌大学信息工程学院;
【基金】：国家自然科学基金(11302095)~~
【分类号】：O357.3;O414.1

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