Rigid clusters in shear-thickening suspensions: a nonequilibrium critical transition
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866917037965574144 |
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| author | Santra, Aritra Orsi, Michel Chakraborty, Bulbul Morris, Jeffrey F. |
| author_facet | Santra, Aritra Orsi, Michel Chakraborty, Bulbul Morris, Jeffrey F. |
| contents | The onset and growth of rigid clusters in a two-dimensional (2D) suspension in shear flow are studied by numerical simulations. The suspension exhibits the lubricated-to-frictional rheology transition, but the key results here are for stresses above the levels that cause extreme shear-thickening. At large solid fraction, $ϕ$, but below the stress-dependent jamming fraction, we find a critical $ϕ_{c}(σ,μ)$ where $σ$ is a dimensionless shear stress and $μ$ is the interparticle friction coefficient. For $ϕ>ϕ_c$, the proportion of particles in rigid clusters grows sharply, as $f_{\rm rig} \sim |ϕ-ϕ_{c}|^β$ with $β=1/8$. The fluctuations in the fraction of particles in rigid clusters yield a susceptibility measure $χ_{\rm rig} \sim |ϕ-ϕ_{c}|^{-γ}$ with $γ= 7/4$. The system is thus found to exhibit criticality. The results are shown to depend on an effective field $h(μ)$, which provides data collapse near $ϕ_c$ for both $f_{\rm rig}$ and $χ_{\rm rig}$. This behavior occurs over a range of stresses, with $ϕ_c(σ,μ)$ increasing as the stress decreases. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_15165 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Rigid clusters in shear-thickening suspensions: a nonequilibrium critical transition Santra, Aritra Orsi, Michel Chakraborty, Bulbul Morris, Jeffrey F. Soft Condensed Matter Statistical Mechanics The onset and growth of rigid clusters in a two-dimensional (2D) suspension in shear flow are studied by numerical simulations. The suspension exhibits the lubricated-to-frictional rheology transition, but the key results here are for stresses above the levels that cause extreme shear-thickening. At large solid fraction, $ϕ$, but below the stress-dependent jamming fraction, we find a critical $ϕ_{c}(σ,μ)$ where $σ$ is a dimensionless shear stress and $μ$ is the interparticle friction coefficient. For $ϕ>ϕ_c$, the proportion of particles in rigid clusters grows sharply, as $f_{\rm rig} \sim |ϕ-ϕ_{c}|^β$ with $β=1/8$. The fluctuations in the fraction of particles in rigid clusters yield a susceptibility measure $χ_{\rm rig} \sim |ϕ-ϕ_{c}|^{-γ}$ with $γ= 7/4$. The system is thus found to exhibit criticality. The results are shown to depend on an effective field $h(μ)$, which provides data collapse near $ϕ_c$ for both $f_{\rm rig}$ and $χ_{\rm rig}$. This behavior occurs over a range of stresses, with $ϕ_c(σ,μ)$ increasing as the stress decreases. |
| title | Rigid clusters in shear-thickening suspensions: a nonequilibrium critical transition |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/2401.15165 |