Abstract
The lattice Boltzmann (LB) method, as a mesoscopic approach based on the kinetic theory, has been significantly developed and applied in a variety of fields in the recent decades. Among all the LB community members, the pseudopotential LB plays an increasingly important role in multiphase flow and phase change problems simulation. The thermal immiscible multiphase flow simulation using pseudopotential LB method is studied in this work. The results show that it is difficult to achieve multi-bubble/droplet coexistence due to the unphysical mass transfer phenomenon of “the big eat the small” – the small bubbles/droplets disappear and the big ones getting bigger before a physical coalescence when using an internal energy based temperature equation for single-component multiphase (SCMP) pseudopotential models. In addition, this unphysical effect can be effectively impeded by coupling an entropy-based temperature field, and the influence on density fields with different energy equations are discussed. The findings are identified and reported in this paper for the first time. This work gives a significant inspiration for solving the unphysical mass transfer problem, which determines whether the SCMP LB model can be used for multi-bubble/droplet systems.
Original language | English |
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Pages (from-to) | 136-138 |
Number of pages | 3 |
Journal | International Communications in Heat and Mass Transfer |
Volume | 88 |
Early online date | 19 Sept 2017 |
DOIs | |
Publication status | Published - Nov 2017 |
Externally published | Yes |
Keywords
- Multi-bubble/droplet coexistence
- Pseudopotential lattice Boltzmann method
- Thermal immiscible multiphase flow
- Unphysical mass transfer
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- General Chemical Engineering
- Condensed Matter Physics