Work

Intermittent Thermal Convection in Jammed Emulsions

Year: 2024

Type: article

Abstract: We study the process of thermal convection in jammed emulsions with a yield-stress rheology. We find that heat transfer occurs via an intermittent mechanism, whereby intense short-lived convective "heat bursts" are spaced out by long-lasting conductive periods. This behavior is the result of a sequence of fluidization-rigidity transitions, rooted in a nontrivial interplay between emulsion yield-stress rheology and plastic activity, which we characterize via a statistical analysis of the dynamics at the droplet scale. We also show that droplets' coalescence induced during heat bursts leads to a spatially heterogeneous phase inversion of the emulsion which eventually supports a sustained convective state.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.133.244001

Authors: Francesca Pelusi, Andrea Scagliarini, Mauro Sbragaglia, Massimo Bernaschi, Roberto Benzi

Institutions: Istituto per le Applicazioni del Calcolo Mauro Picone, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata, University of Rome Tor Vergata

Language: English

Topic: Material Dynamics and Properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: European Commission, Horizon 2020 Framework Programme

Awards: G1376270528, G4937468798, Towards EXtreme scale Technologies and Accelerators for euROhpc hw/Sw Supercomputing Applications for exascale, G8809143774