Phase Separation of Binary Fluids with Dynamical Temperature

Thermal phase separation process, which follows a sudden quench in the coexistence region, is con- sidered for binary fluid mixtures. It is studied applying a new version of an hybrid lattice Boltzmann model, where non-ideal terms of the pressure tensor, which takes into account thermal and concen- tration gradient contribution, are included as a body force in the LBM equations, used to solve the Navier-Stokes equations. The equations for concentration and temperature are solved using a finite dif- ference scheme. Domains are observed to order preferably with interfaces parallel to the cold walls and this behavior is more pronounced at higher viscosities. An intermediate regime with two characteristics scales for the domain size, one close to the walls and the other in the middle of the system, has been also observed.