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@ARTICLE{Lee:1028626,
author = {Lee, Namkyu and Wiegand, Simone},
title = {{T}hermal design of a non-isothermal microfluidic channel
for measuring thermophoresis},
journal = {International journal of heat and mass transfer},
volume = {231},
issn = {0017-9310},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2024-04699},
pages = {125871 -},
year = {2024},
abstract = {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.},
cin = {IBI-4},
ddc = {620},
cid = {I:(DE-Juel1)IBI-4-20200312},
pnm = {5241 - Molecular Information Processing in Cellular Systems
(POF4-524)},
pid = {G:(DE-HGF)POF4-5241},
typ = {PUB:(DE-HGF)16},
UT = {WOS:001265297700001},
doi = {10.1016/j.ijheatmasstransfer.2024.125871},
url = {https://juser.fz-juelich.de/record/1028626},
}