Hauptseite > Publikationsdatenbank > Thermal design of a non-isothermal microfluidic channel for measuring thermophoresis > print

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024 7 _ |a 10.1016/j.ijheatmasstransfer.2024.125871
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024 7 _ |a 1879-2189
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024 7 _ |a 10.34734/FZJ-2024-04699
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100 1 _ |a Lee, Namkyu
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245 _ _ |a Thermal design of a non-isothermal microfluidic channel for measuring thermophoresis
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a Thermophoresis describes mass transport in a non-isothermal temperature field and thus provides a fundamentalunderstanding of the behavior of colloidal particles. Various methods have been proposed for measuringthe Soret coefficient, a representative value of thermophoresis. In particular, microscopic channels are anemerging method as they shorten the equilibrium time and allow direct observation of the particles. However,little emphasis has been placed on the simultaneous consideration of fluid dynamics, heat transfer, andmass transfer characteristics within the microfluidic channel, despite the simultaneous presence of naturalconvection and thermodiffusion phenomena. In this study, we present a novel approach to address this gap byintroducing a figure of merit, which incorporates essential parameters to accurately characterize a specific cellconfiguration. This figure of merit allows for the identification of a reliable measurement range in a microfluidicchannel with a temperature gradient, while accounting for fluid dynamics, heat transfer, and mass transfercharacteristics. The proposed approach is validated through rigorous simulations and experiments, enabling anevaluation of the impact of figure of merit-derived parameters on the measurement channel. The findings fromour study demonstrate that the figure of merit serves as a representative measure for stable thermophoreticmeasurements in a microfluidic channel. Moreover, we propose a threshold value that signifies the transitionfrom a diffusion-dominant to a convection-dominant field.
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700 1 _ |a Wiegand, Simone
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773 _ _ |a 10.1016/j.ijheatmasstransfer.2024.125871
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