Department of Physics, Chiba University, Chiba 263-8522, Japan.
WPI-AIMR, Tohoku University, Sendai, Miyagi 980-8577, Japan.
J Chem Phys. 2018 Apr 7;148(13):134906. doi: 10.1063/1.5021502.
Surface-active molecules supplied from a particle fixed at the water surface create a spatial gradient of the molecule concentration, resulting in Marangoni convection. Convective flow transports the molecules far from the particle, enhancing diffusion. We analytically derive the effective diffusion coefficient associated with the Marangoni convection rolls. The resulting estimated effective diffusion coefficient is consistent with our numerical results and the apparent diffusion coefficient measured in experiments.
表面活性分子由固定在水面上的颗粒供给，在表面形成分子浓度的空间梯度，从而产生马兰戈尼对流。对流流动将分子从颗粒处输送到远处，从而增强了扩散。我们从理论上推导出与马兰戈尼对流卷相关的有效扩散系数。得到的估计有效扩散系数与我们的数值结果和实验中测量的表观扩散系数一致。
