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Secondary Dean flow characteristics of inelastic Bird-Carreau fluids in curved microchannels
Ist Teil von
The Korea-Australia Rheology Journal, 2020, 32(1), , pp.61-70
Ort / Verlag
Seoul / Melbourne: Korean Society of Rheology, Australian Society of Rheology
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
To effectively control the mixing of target materials inside microfluidic devices, the Dean flow features of generalized-Newtonian Bird-Carreau (BC) fluids in curved rectangular channels are theoretically investigated, as a passive technique. Governing equations coupled with the Cauchy momentum equation and the BC model are solved using the finite volume scheme with a semi-implicit method for pressure-linked equations-revised (SIMPLER) algorithm. The effects of the rheological parameters of BC model, such as viscosity ratio, power-law index, and relaxation time constant, on the Dean flow are systematically examined in a wide range of Dean numbers (
Dn
), (very low to O(10
2
)). The entire flow characteristics of BC fluids in curved microchannels with increasing
Dn
are quantified using flow skewness,
Dn
Ref
/
Dn
MES
, and magnitude of vorticity, resulting in two main findings of a more outward-skewed streamwise velocity profile and a more enhanced secondary Dean vortex for non-Newtonian fluids in comparison to the Newtonian case at the same
Dn
.