| Citation: | WANG Weihao, ZHOU Yi, ZHAO Yugang, et al. Near-wall thermophoresis analysis of charged colloidal particle in aqueous media[J]. Journal of Aerospace Power, 2026, 41（1）：20240079 doi: 10.13224/j.cnki.jasp.20240079
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A numerical simulation method based on the particle motion reference system was built, and an experimental validation platform combined with microfluidic technology was developed to investigate the hydrodynamic boundary effect on near-wall thermophoresis of a charged colloidal particle in aqueous solution with different relative thicknesses of the electrical double layer. The results showed that there was an inflection point when the particle moved towards the wall: near the inflection point, the far-field fluid flow direction was opposite to the particle thermophoresis and a pair of vortices were generated, which produced strong hydrodynamic boundary effects and led to an intensified decrease of the thermodiffusion coefficient; when the particle moved across the inflection point, the region of the far-field vortices expanded and compressed the reversed vortice near the particle, which produced stronger hydrodynamic boundary effects and resulted in a sharp decrease of the thermodiffusion coefficient. Therefore, the inflection point represented the range of hydrodynamic boundary effects on the near-wall thermophoresis, which was related to the relative thickness of the electrical double layer: when the electrical double layer thickness was thicker than the particle radius, the region of the hydrodynamic boundary effects was up to several hundred times of the particle radius; when the electrical double layer thickness was thinner than the particle radius, the region of the hydrodynamic boundary effects shrank to the order of particle diameter. A systematic study of the hydrodynamic boundary effects on the near-wall thermophoresis could provide theoretical guidance and experimental support for nanofluid enhanced heat transfer, which could be applied to the space vehicles and the electronic heat dissipation.
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