2018/01/22 by Anika Jain, Jain, Anika, Ramanish Singh +7
Chemical Engineering · Materials Science · #FOS: Physical sciences #Liquid Crystal Research Advancements #Material Dynamics and Properties #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Rheology and Fluid Dynamics Studies #Soft Condensed Matter (cond-mat.soft)
paper · pdf · doi:10.48550/arxiv.1801.07088
openalex publication_date 2018/01/22 · openalex created_date 2022/10/02 · openalex updated_date 2026/07/28
We study the transient start-up dynamics of a fluidity model which captures\nthe rheological behavior of aging soft glassy materials, in a rectilinear shear\nflow upon application of step shear rate. We observe that when the steady state\nflow curve is non-monotonic the system shows transient and/or apparent steady\nstate shear banding in close qualitative agreement with experimental\nobservations. Due to a competetion between aging and rejuvenation during the\nstart up, we show that there is an apparent steady state banding at large times\neven for shear rates such that the steady state flow curve allows for a\nhomogeneous flow. Thus, for aging soft glassy materials, the shear rate for\nachieving homogeneous flow is not necessarily given by the steady-state flow\ncurve. We also observe that the transient and apparent steady state shear\nbanding behavior is not correlated to negative slope of the stress-strain\ndependence during the transient. This work also emphasizes that in order to\nhave a realistic description of shear banding behavior in the aging (time\ndependent) soft glassy materials, consideration of inertia during the start-up\ndynamics is crucial.\n