BPCPPDYSOE21 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 6: Granular Physics 1 - organized by Matthias Sperl (Köln)

DY 6.1: Vortrag

Montag, 22. März 2021, 09:30–09:50, DYc

Flow study for poly-dispersed dense granular suspension in Non-Newtonian media, mimicking concrete flow — •Himanshu P Patel, Peyman Rostami, and Günter K Auernhammer — Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, D-01069 Dresden, Germany

The study of internal flow dynamics and associated particle migration for poly-dispersed dense granular suspension, e.g., flowing concrete, still lacks quantification on a single particle level.

We use a macroscopically highly transparent model system for concrete and cement paste [1] that is a dense granular suspension of particles suspended in non-Newtonian media (particle volume fractions of 42% to 48%). The model system mimics the rheology behavior of cement paste (yield stress and plastic viscosity) and is completely index matched. The rheological characteristics of the model system is tunable through its composition of additives.

We analyze gravity-assisted continuous flow for the model system through a cylindrical pipe. Our setup allows tracking of polydisperse tracer particles at different sections of the pipe and near its wall using diffused back-light illumination. The flow analysis revels a flow profile similar to a plug flow and a migration of larger towards the central region of the flow. Sliding and rolling motion of the particles is observable. The lubrication layer thickness is also evaluated in the study.

[1] Auernhammer, Günter K., et al., Materials & Design (2020): 108673.