Intermittent thermal convection in jammed emulsions
Fuente:
arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866916527510388736 |
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| author | Pelusi, Francesca Scagliarini, Andrea Sbragaglia, Mauro Bernaschi, Massimo Benzi, Roberto |
| author_facet | Pelusi, Francesca Scagliarini, Andrea Sbragaglia, Mauro Bernaschi, Massimo Benzi, Roberto |
| contents | 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 behaviour is the result of a sequence of fluidization-rigidity transitions, rooted in a non-trivial 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_02135 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Intermittent thermal convection in jammed emulsions Pelusi, Francesca Scagliarini, Andrea Sbragaglia, Mauro Bernaschi, Massimo Benzi, Roberto Fluid Dynamics Soft Condensed Matter 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 behaviour is the result of a sequence of fluidization-rigidity transitions, rooted in a non-trivial 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. |
| title | Intermittent thermal convection in jammed emulsions |
| topic | Fluid Dynamics Soft Condensed Matter |
| url | https://arxiv.org/abs/2405.02135 |