English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Harnessing fluidic instabilities to produce structures with robust andregular properties has recently emerged as a new fabrication paradigm. This isexemplified in the work of Gumennik et al. [Nat. Comm. 4:2216, DOI:10.1038/ncomms3216, (2013)], in which the authors fabricate silicon spheres byfeeding a silicon-in-silica co-axial fiber into a flame. Following thelocalized melting of the silicon, a capillary instability of the silicon-silicainterface induces the formation of uniform silicon spheres. Here, we try tounravel the physical mechanisms at play in selecting the size of theseparticles, which was notably observed by Gumennik et al. to vary monotonicallywith the speed at which the fiber is fed into the flame. Using a simplifiedmodel derived from standard long-wavelength approximations, we show that linearstability analysis strikingly fails at predicting the selected particle size.Nonetheless, nonlinear simulations of the simplified model do recover theparticle size observed in experiments, without any adjustable parameters. Thisshows that the formation of the silicon spheres in this system is anintrinsically nonlinear process that has little in common with the loss ofstability of the underlying base flow solution.

Particle size selection in capillary instability of locally heated co-axial fiber