Effect of blockage ratio on flow of a viscoelastic wormlike micellar solution past a cylinder in a microchannel.

ABSTRACT: We present experiments on the flow of a viscoelastic wormlike micellar solution around cylinders (radius R) confined in straight microchannels (width W). Thirteen flow geometries are tested where the blockage ratio is varied over a wide range 0.055 ≤ B_R = 2R/W ≤ 0.63. Experiments are performed at negligible Reynolds number, and for Weissenberg numbers Wi = λU/R up to 1000, where U is the average flow speed and λ is the relaxation time of the fluid. Micro-particle image velocimetry is used to characterise the flow state at each B_R and Wi. In all of the geometries, a first critical Weissenberg number marks a transition from symmetric flow to an asymmetric but time-steady flow state, whil

SUBMITTER: Hopkins CC 

PROVIDER: S-EPMC9709659 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature