التفاصيل البيبلوغرافية
| العنوان: |
Anomalous convective flows carve pinnacles and scallops in melting ice |
| المؤلفون: |
Weady, Scott, Tong, Joshua, Zidovska, Alexandra, Ristroph, Leif |
| سنة النشر: |
2021 |
| المجموعة: |
Physics (Other) |
| مصطلحات موضوعية: |
Physics - Fluid Dynamics |
| الوصف: |
We report on the shape dynamics of ice suspended in cold fresh water and subject to the natural convective flows generated during melting. Experiments reveal shape motifs for increasing far-field temperature: Sharp pinnacles directed downward at low temperatures, scalloped waves for intermediate temperatures between 5 and $7^\circ$C, and upward pointing pinnacles at higher temperatures. Phase-field simulations reproduce these morphologies, which are closely linked to the anomalous density-temperature profile of liquid water. Boundary layer flows yield pinnacles that sharpen with accelerating growth of tip curvature while scallops emerge from a Kelvin-Helmholtz-like instability caused by counterflowing currents that roll up to form vortex arrays. By linking the molecular-scale effects underlying water's density anomaly to the macro-scale flows that imprint the surface, these results show that the morphology of melted ice is a sensitive indicator of ambient temperature. |
| نوع الوثيقة: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.128.044502 |
| URL الوصول: |
http://arxiv.org/abs/2111.09937 |
| رقم الانضمام: |
edsarx.2111.09937 |
| قاعدة البيانات: |
arXiv |