Details

Autor(en) / Beteiligte

• Yoon, Kyu
• Jung, Hyun Wook
• Chun, Myung-Suk

Titel

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 .