A thermal immiscible multiphase flow simulation by lattice Boltzmann method

Gong, Wei; Chen, Sheng; Yan, Yuying

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.

Citation

Gong, W., Chen, S., & Yan, Y. (in press). A thermal immiscible multiphase flow simulation by lattice Boltzmann method. International Communications in Heat and Mass Transfer, 88, https://doi.org/10.1016/j.icheatmasstransfer.2017.08.019

• Journal Article Type: Article
• Acceptance Date: Aug 21, 2017
• Online Publication Date: Sep 19, 2017
• Deposit Date: Sep 14, 2017
• Publicly Available Date: Sep 20, 2018
• Journal: International Communications in Heat and Mass Transfer
• Print ISSN: 0735-1933
• Electronic ISSN: 0735-1933
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 88
• DOI: https://doi.org/10.1016/j.icheatmasstransfer.2017.08.019
• Keywords: multi-bubble/droplet coexistence, unphysical mass transfer, thermal immiscible multiphase flow, pseudopotential lattice Boltzmann method
• Public URL: https://nottingham-repository.worktribe.com/output/883187
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0735193317302294
• Contract Date: Sep 14, 2017