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Title: Signature of jamming under steady shear in dense particulate suspensions
Authors: Dhar, Subhransu
Chattopadhyay, Sebanti Sebanti
Majumdar, Sayantan
Keywords: shear jamming
dense suspensions
Issue Date: 31-Jan-2020
Publisher: The IOP Publishing Ltd.
Citation: Journal of Physics: Condensed Matter, 2020, Vol.32, Article No.124002
Abstract: Under an increasing applied shear stress ([ image ]), the viscosity of many dense particulate suspensions increases drastically beyond a stress onset ([ image ]), a phenomenon known as discontinuous shear-thickening. Recent studies point out that some suspensions can transform into a stress induced solid-like shear jammed (SJ) state at high particle volume fraction ([ image ]). SJ state develops a finite yield stress and hence is distinct from a shear-thickened state. Here, we study the steady state shear-thickening behaviour of dense suspensions formed by dispersing colloidal polystyrene particles (PS) in polyethylene glycol (PEG). We find that for small [ image ] values the viscosity of the suspensions as a function of [ image ] can be well described by Krieger─Dougherty (KD) relation. However, for higher values of [ image ] ([ image ][ image ]), KD relation systematically overestimates the measured viscosity, particularly for higher [ image ] values. This systematic deviation can be rationalized by the weakening of the sample due to flow induced failures of the solid-like SJ state. Using Wyart─Cates model, we propose a method to predict the SJ onset from the steady state rheology measurements. Our results are further supported by in situ optical imaging of the sample boundary under shear.
Description: Restricted Access
ISSN: 0953-8984
1361-648X (Online)
Alternative Location:
Copyright: 2019 IOP Publishing Ltd.
Additional information: Supplementary Information Available
Appears in Collections:Research Papers (SCM)

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