Using an original numerical simulator of ILIDS images, we propose and discuss the performances of dif-ferent ILIDS configurations for microscopy, volumic 3D droplet characterization, and fringe frequency calibrations....Using an original numerical simulator of ILIDS images, we propose and discuss the performances of dif-ferent ILIDS configurations for microscopy, volumic 3D droplet characterization, and fringe frequency calibrations. This exact simulator offers important perspectives in the realization of complete ILIDS instruments and for in situ measurements.展开更多
Snowflake growth provides a fascinating example of spontaneous pattern formation in nature.Attempts to understand this phenomenon have led to important insights in non-equilibrium dynamics observed in various active s...Snowflake growth provides a fascinating example of spontaneous pattern formation in nature.Attempts to understand this phenomenon have led to important insights in non-equilibrium dynamics observed in various active scientific fields,ranging from pattern formation in physical and chemical systems,to self-assembly problems in biology.Yet,very few models currently succeed in reproducing the diversity of snowflake forms in three dimensions,and the link between model parameters and thermodynamic quantities is not established.Here,we report a modified phase field model that describes the subtlety of the ice vapour phase transition,through anisotropic water molecules attachment and condensation,surface diffusion,and strong anisotropic surface tension,that guarantee the anisotropy,faceting and dendritic growth of snowflakes.We demonstrate that this model reproduces the growth dynamics of the most challenging morphologies of snowflakes from the Nakaya diagram.We find that the growth dynamics of snow crystals matches the selection theory,consistently with previous experimental observations.展开更多
文摘Using an original numerical simulator of ILIDS images, we propose and discuss the performances of dif-ferent ILIDS configurations for microscopy, volumic 3D droplet characterization, and fringe frequency calibrations. This exact simulator offers important perspectives in the realization of complete ILIDS instruments and for in situ measurements.
基金financial support through the CISTIC project of programme Investissements d’Avenir LabEx EMC3(ANR-10-LABX-09-01).
文摘Snowflake growth provides a fascinating example of spontaneous pattern formation in nature.Attempts to understand this phenomenon have led to important insights in non-equilibrium dynamics observed in various active scientific fields,ranging from pattern formation in physical and chemical systems,to self-assembly problems in biology.Yet,very few models currently succeed in reproducing the diversity of snowflake forms in three dimensions,and the link between model parameters and thermodynamic quantities is not established.Here,we report a modified phase field model that describes the subtlety of the ice vapour phase transition,through anisotropic water molecules attachment and condensation,surface diffusion,and strong anisotropic surface tension,that guarantee the anisotropy,faceting and dendritic growth of snowflakes.We demonstrate that this model reproduces the growth dynamics of the most challenging morphologies of snowflakes from the Nakaya diagram.We find that the growth dynamics of snow crystals matches the selection theory,consistently with previous experimental observations.
