图 1  带电胶体颗粒的近壁面热泳数值模型示意图

Figure 1.  Schematic diagram of the numerical model for thermophoresis of charged colloidal particles near the wall surface

图 2  距离壁面远时颗粒热泳系数的数值仿真结果与Rasuli等^[17]分析解的比较图

Figure 2.  Numerical simulation results of particle thermophoretic coefficients at a distance from the wall in comparison with the analytical solution of Rasuli, et al.^[17]

图 3  近壁面热泳实验系统示意图

Figure 3.  Schematic of the near-wall thermophoretic experimental system

图 4  当$ {\kappa _0}a = 0.01 $时，采用不同参考系求解的颗粒附近的无量纲轴向速度$ {u^*} $分布情况

Figure 4.  Distribution of the dimensionless axial velocity $ {u^*} $ around the particle in two reference frames when $ {\kappa _0}a = 0.01 $

图 5  $ {\kappa _0}a = 0.1 $时，不同颗粒-壁面之间的距离时无量纲轴向速度$ {u^*} $分布情况

Figure 5.  Distribution of the dimensionless axial velocity $ {u^*} $ when $ {\kappa _0}a = 0.1 $ for different particle-wall distances

图 6  $ {\kappa _0}a = 1 $时，不同颗粒-壁面之间的距离时无量纲轴向速度$ {u^*} $分布情况

Figure 6.  Distribution of the dimensionless axial velocity $ {u^*} $ when $ {\kappa _0}a = 1 $ for different particle-wall distances

图 7  $ {\kappa _0}a = 10 $时，不同颗粒-壁面之间的距离时无量纲轴向速度$ {u^*} $分布情况

Figure 7.  Distribution of the dimensionless axial velocity $ {u^*} $ when $ {\kappa _0}a = 10 $ for different particle-wall distances

图 8  热泳系数$ {D_{\mathrm{t}}} $随颗粒-壁面之间的距离与颗粒半径的比值${h^*}$的变化曲线

Figure 8.  Variation of the thermophoretic coefficient $ {D_{\mathrm{t}}} $ with the ratio of the particle-wall distance to the particle radius ${h^*}$

图 9  热泳系数比值$ \beta $的数值解与实验结果随颗粒-壁面之间的距离与颗粒半径之比${h^*}$的变化

Figure 9.  Variations of numerical and experimental thermophoretic coefficients $ \beta $ with the ratio ${h^*}$ of the particle-wall distance to the particle radius