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Laboratory layered latte
KTH, School of Engineering Sciences (SCI), Mechanics.
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2017 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 8, article id 1960Article in journal (Refereed) Published
Abstract [en]

Inducing thermal gradients in fluid systems with initial, well-defined density gradients results in the formation of distinct layered patterns, such as those observed in the ocean due to double-diffusive convection. In contrast, layered composite fluids are sometimes observed in confined systems of rather chaotic initial states, for example, lattes formed by pouring espresso into a glass of warm milk. Here, we report controlled experiments injecting a fluid into a miscible phase and show that, above a critical injection velocity, layering emerges over a time scale of minutes. We identify critical conditions to produce the layering, and relate the results quantitatively to double-diffusive convection. Based on this understanding, we show how to employ this single-step process to produce layered structures in soft materials, where the local elastic properties vary step-wise along the length of the material.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017. Vol. 8, article id 1960
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Other Materials Engineering
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URN: urn:nbn:se:kth:diva-220597DOI: 10.1038/s41467-017-01852-2ISI: 000417701600001PubMedID: 29234036Scopus ID: 2-s2.0-85037729833OAI: oai:DiVA.org:kth-220597DiVA, id: diva2:1174978
Note

QC 20180117

Available from: 2018-01-17 Created: 2018-01-17 Last updated: 2018-01-17Bibliographically approved

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Zhu, Lailai

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