Development of a double-MRT pseudopotential model for tridimensional boiling simulation

FOGLIATTO, EZEQUIEL O.; CLAUSSE, ALEJANDRO; TERUEL, FEDERICO E.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

Año: 2022 vol. 179

1290-0729

A new thermal lattice Boltzmann scheme for the simulation of heat transfer and phase change in multiphase flows based on the pseudopotential formulation is introduced. The model includes a novel elaboration of the equilibrium distribution function, source term, and off-diagonal elements of the relaxation matrix. The resulting equation formally recovers the macroscopic advection-diffusion equation for energy transport avoiding unwanted non-physical terms. Moreover, the thermal diffusivity can be controlled using relaxation factors and free parameters of the equilibrium distribution. The new model is applied to simulate the stratification of a van der Waals fluid and the one-dimensional Stefan problem. In particular, the predictive capability of the model is testedagainst real experimental conditions, finding good agreement in the bubble growth rate and the walltemperature dependence of the departure diameter.