TY  - JOUR
AU  - Lee, Namkyu
AU  - Wiegand, Simone
TI  - Thermal design of a non-isothermal microfluidic channel for measuring thermophoresis
JO  - International journal of heat and mass transfer
VL  - 231
SN  - 0017-9310
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2024-04699
SP  - 125871 -
PY  - 2024
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001265297700001
DO  - DOI:10.1016/j.ijheatmasstransfer.2024.125871
UR  - https://juser.fz-juelich.de/record/1028626
ER  -