When Cooling Meets Flow: Advection-Driven Orientation Selection in Phase Separation around a Moving Cooling Source
Abstract
We investigate phase separation in a binary fluid subjected to a moving Gaussian cooling source and externally imposed material flow. Unlike conventional homogeneous quenches, the moving thermal field initiates phase separation at different times across the system, creating a spatially varying thermal history and local age. The interplay of a moving cooling source, phase separation and external flow field introduces directional bias, resulting in anisotropic pattern formation. Using an advective Cahn-Hilliard-Cook model coupled to a spatially and temporally varying temperature field, we examine how front propagation, thermal diffusion, phase separation, and material transport jointly select the evolving morphology. In the absence of flow, increasing the cooling-source velocity drives a transition from nearly symmetric structures to asymmetric spiral-like patterns and, at higher velocities, to narrow elongated domains as the thermal front increasingly lags behind the source. Advection reorganizes the phase-separated domains by transporting, stretching, and reorienting them. At low flow velocities, competing thermal and advective histories produce distinct regions of flow-aligned and vertical layers. A stronger flow aligns the domains predominantly along the flow direction. Our results demonstrate that a moving thermal history can encode a spatial record of non-equilibrium phase separation. This work provides a route to controlled morphology selection through the competition between front propagation, thermal diffusion, and material flow.
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BibTeX
@misc{lakshmipriya2026when,
title = {{When Cooling Meets Flow: Advection-Driven Orientation Selection in Phase Separation around a Moving Cooling Source}},
author = {Lakshmipriya K and Sutapa Roy},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.23285},
eprint = {2610.23285},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.23285},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - When Cooling Meets Flow: Advection-Driven Orientation Selection in Phase Separation around a Moving Cooling Source
AU - Lakshmipriya K
AU - Sutapa Roy
PY - 2026
DA - 2026/10/16
PB - arXiv
DO - 10.48550/arxiv.2610.23285
UR - https://arxiv.org/abs/2610.23285
AB - We investigate phase separation in a binary fluid subjected to a moving Gaussian cooling source and externally imposed material flow. Unlike conventional homogeneous quenches, the moving thermal field initiates phase separation at different times across the system, creating a spatially varying thermal history and local age. The interplay of a moving cooling source, phase separation and external flow field introduces directional bias, resulting in anisotropic pattern formation. Using an advective Cahn-Hilliard-Cook model coupled to a spatially and temporally varying temperature field, we examine how front propagation, thermal diffusion, phase separation, and material transport jointly select the evolving morphology. In the absence of flow, increasing the cooling-source velocity drives a transition from nearly symmetric structures to asymmetric spiral-like patterns and, at higher velocities, to narrow elongated domains as the thermal front increasingly lags behind the source. Advection reorganizes the phase-separated domains by transporting, stretching, and reorienting them. At low flow velocities, competing thermal and advective histories produce distinct regions of flow-aligned and vertical layers. A stronger flow aligns the domains predominantly along the flow direction. Our results demonstrate that a moving thermal history can encode a spatial record of non-equilibrium phase separation. This work provides a route to controlled morphology selection through the competition between front propagation, thermal diffusion, and material flow.
ER -