Interparticle and Brownian forces controlling particle aggregation and rheology of silicate melts containing platinum-group element particles.

ABSTRACT: We study the rheology of silicate melts containing platinum-group element (PGE) particles. They exhibit a shear-thinning behaviour, an intense aggregation tendency, and an anomalously high apparent viscosity in the low shear rate limit, even at very low particle volume fraction. Using a compilation of published experimental data, we analyse these effects in three steps. Firstly, we observe that the viscosities of these suspensions are much higher than those of natural silicate crystal-bearing melts for low shear rate regimes. Secondly, we demonstrate that the viscosities at low shear rate limit cannot be estimated by classical rheological models but rather may be understood as the result of particle aggregation, trapping dead fluid, and thereby increasing the effective particle volume frac

SUBMITTER: Pereira L 

PROVIDER: S-EPMC9163177 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature