| Citation: | XU Li, CHEN Wenqin, ZHOU Yi, et al. Thermal conductivity effect on anisotropic thermophoresis of charged spheroidal colloid in aqueous media[J]. Journal of Aerospace Power, 2025, 40（6）：20240023 doi: 10.13224/j.cnki.jasp.20240023
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For the anisotropic thermophoresis of a charged spheroidal colloidal particle in aqueous media, based on the boundary layer approximation and the extremely thin electric double layer assumption, the analytical formulations of thermophoretic velocity, thermodiffusion coefficient and thermophoretic force under the thermal conductivity effect were derived. The results showed that the thermal conductivity effect not only changed the values of thermodiffusion coefficient and thermophoretic force of anisotropic thermophoresis of spheroidal particles, but also affected greatly the directions of thermodiffusion coefficient and thermophoretic force. The values of thermodiffusion coefficient and thermophoretic force of polymer spheroidal particles were always higher than those of “normal” particles (i.e. particles with the same thermal conductivity as the fluid), while the thermodiffusion coefficient and thermophoretic force of metal oxide spheroidal particles were lower than those of “normal” particles. Compared with the “normal” particles, the anisotropic thermophoresis of polymer spheroidal particles was weakened, and that of metal oxide spheroidal particles was enhanced. The influence of thermal conductivity on the anisotropic thermophoresis of spheroidal colloidal particles was systematically studied, which can shed a light on the engineering design of microscale thermophoresis turbine for the micro-aerial vehicles.
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