Drying of porous materials at pore scale using lattice Boltzmann and pore network models

Jianlin Zhao, Feifei Qin, Dominique Derome, Jan Carmeliet

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Drying at macroscale shows a first drying period with constant drying rate followed by second drying period showing a receding moisture front, phenomena that can be tailored upon need. In order to study the drying of materials, we present a new hybrid computational method, where the dynamics of the liquid-vapor interfaces is modelled by lattice Boltzmann modelling (LBM) in the two-phase pores, while the single-phase flow in the pores filled solely by vapor or liquid is solved by pore network model (PNM). This hybrid method is validated by comparison with reference full LBM simulations. The hybrid method combines the advantages of both methods, i.e., accuracy and computational efficiency. LBM and the hybrid LBM-PNM method are used to study the drying of porous media at pore scale. We analyse two different pore structures and consider how capillary pumping effect can maximize the drying rate. Finally, we indicate how optimized drying rates are relevant when designing facade or pavement solutions that can mitigate higher surface temperatures in urban environments by evaporative cooling.

Original languageEnglish
Article number012001
JournalJournal of Physics: Conference Series
Volume2069
DOIs
StatePublished - 2 Dec 2021
Externally publishedYes
Event8th International Building Physics Conference, IBPC 2021 - Copenhagen, Virtual, Denmark
Duration: 25 Aug 202127 Aug 2021

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