Effects of shear flow on phase nucleation and crystallization
Physical Review E
American Physical Society
MetadataShow full item record
Mura, F., & Zaccone, A. (2016). Effects of shear flow on phase nucleation and crystallization. Physical Review E, 93 (042803)
This is the author accepted manuscript. The final version is available from the American Physical Society via http://dx.doi.org/10.1103/PhysRevE.93.042803
Classical nucleation theory offers a good framework for understanding the common features of new phase formation processes in metastable homogeneous media at rest. However, nucleation processes in liquids are ubiquitously affected by hydrodynamic flow, and there is no satisfactory understanding of whether shear promotes or slows down the nucleation process. We developed a classical nucleation theory for sheared fluids systems starting from the molecular-level of the BeckerDoering master kinetic equation, and analytically derived a closed-form expression for the nucleation rate. The theory accounts for the effect of flow-mediated transport of molecules to the nucleus of the new phase, as well as for the mechanical deformation imparted to the nucleus by the flow field. The competition between flow-induced molecular transport, which accelerates nucleation, and flow-induced nucleus straining, which lowers the nucleation rate by increasing the nucleation energy barrier, gives rise to a marked non-monotonic dependence of the nucleation rate on the shear-rate. The theory predicts an optimal shear-rate at which the nucleation rate is one order of magnitude larger than in the absence of flow.
F. M. is supported by a DFG Fellowship through the Graduate School of Quantitative Biosciences Munich (QBM). Discussions with Professor Daan Frenkel are gratefully acknowledged.
Attribution-NonCommercial 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by-nc/2.0/uk/
Recommended or similar items
The following licence files are associated with this item: