Insight into transport performance at the interface of porous catalytic particle by means of numerical simulation.

• Pore-scale model is implemented for double slip effect at permeable interface. • Gas rarefaction effect on velocity slip and thermal slip is evaluated. • Influence of pore size and porosity on mass/heat transfer is revealed. The double slip effect plays an important role in transport characteristics at the permeable porous interface between porous catalytic particle and free fluid, especially for coke deposition process. In this work, a direct pore-scale simulation is carried out via lattice Boltzmann method to investigate the mass, momentum and heat transfer process inside a porous composite system. The spatial distribution of velocity and temperature under the gas rarefaction effect is analyzed. Meanwhile, the impact of coke deposition on the double slip effect is also revealed. The results reveal that a high gas rarefaction effect can weaken the velocity double slip, which are greatly influenced by pore structural parameters. The dynamic evolution of pore structure, flow and heat transfer characteristics of the porous interface during the coke deposition process is investigated. It is found that the heat flow bifurcation phenomenon is enhanced under a high gas rarefaction effect. [ABSTRACT FROM AUTHOR]