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首页> 外文期刊>Engineering Mathematics >Adaptation of Surface Rejuvenation Model to Turbulent Mass Transfer with Coupling Between Thermophoretic and Coulombic Force Interactions
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Adaptation of Surface Rejuvenation Model to Turbulent Mass Transfer with Coupling Between Thermophoretic and Coulombic Force Interactions

机译：表面光子化模型与库仑力相互作用耦合对湍流传质的适应

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摘要

Development and applications of the surface rejuvenation model for particle transport towards the surface through turbulent boundary layer involve (1) the introduction of the constitutive equations to establish relations between the fluxes involved in mass transfer processes and the respective driving potentials, (2) the use of definition of the convective velocity to separate the mass transfer flux into diffusive and convective components based on Eulerian models of turbulent deposition proposed by Guha [1] and Young and Leeming [2], (3) the introduction of exponentially distributed functions given by Danckwerts [3] to transform the instantaneous transport properties into the mean domain prior to the solution of the conservation equations, and finally (4) the use of developed relationships for the mean concentration profile and mass transfer flux to obtained an analytical solution for the mean deposition velocity of neutral and charged particles. The deposition velocity of neutral particles with and without including thermophoretic effect is first calculated and then used to clarify the effects caused by the presence of external imposed electric field. A comparison with the experimental data and other theoretical predictions shows that the surface rejuvenation model is logical in finding the combined effect of thermophoresis and turbophoresis on the deposition of neutral particles and confirming the relative independence of deposition velocity upon these drift mechanisms at high values of particle inertia. When both thermophoretic and Coulombic forces operate together, two important conclusions are obtained from this model: (1) the contribution to particle deposition velocities does not represent the sum of these drift mechanisms considered in isolation; (2) the turbophoresis induces an additional drift velocity toward the wall in the vicinity of the wall, alleviating these external forces and enhancing particle deposition onto the wall through reduced build-up of particle concentration adjacent to the wall.
机译：用于通过湍流边界层向表面传输粒子的表面再生模型的开发和应用涉及（1）引入本构方程，以建立质量传递过程中涉及的通量与各个驱动势之间的关系，（2）使用Guha [1]和Young and Leeming [2]提出的基于欧拉湍流沉积模型的对流速度定义，将传质通量分为扩散和对流成分，（3）Danckwerts给出指数分布函数[3]在守恒方程求解之前将瞬时传输特性转换为平均域，最后（4）利用平均浓度分布和传质通量的已发展关系获得平均沉积的解析解中性粒子和带电粒子的速度。首先计算具有和不具有热泳效应的中性粒子的沉积速度，然后将其用于澄清由外部强加电场的存在引起的影响。与实验数据和其他理论预测的比较表明，表面活化模型是合理的，可发现热泳和涡轮泳对中性粒子沉积的组合影响，并确认在高粒子值下这些漂移机制对沉积速度的相对独立性惯性。当热泳力和库仑力同时作用时，可以从该模型中得出两个重要结论：（1）对颗粒沉积速度的贡献并不代表孤立考虑的这些漂移机制的总和; （2）涡轮电泳在壁附近产生了一个额外的朝向壁的漂移速度，从而减轻了这些外力，并通过减少了壁附近的颗粒浓度的增加而增强了颗粒在壁上的沉积。

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