@article{discovery10199840,
       publisher = {CAMBRIDGE UNIV PRESS},
           title = {Pore-scale study of CO2 desublimation and sublimation in a packed bed during cryogenic carbon capture},
            year = {2024},
           month = {July},
            note = {This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.},
          volume = {990},
         journal = {Journal of Fluid Mechanics},
            issn = {0022-1120},
        keywords = {Convection in porous media, solidification/melting, coupled diffusion and flow},
        abstract = {Cryogenic carbon capture (CCC) is an innovative technology to desublimate CO2 out of industrial flue gases. A comprehensive understanding of CO2 desublimation and sublimation is essential for widespread application of CCC, which is highly challenging due to the complex physics behind. In this work, a lattice Boltzmann (LB) model is proposed to study CO2 desublimation and sublimation for different operating conditions, including the bed temperature (subcooling degree ?Ts), gas feed rate (P{\'e}clet number Pe) and bed porosity ({\ensuremath{\psi}}). The CO2 desublimation and sublimation properties are reproduced. Interactions between convective CO2 supply and desublimation/sublimation intensity are analysed. In the single-grain case, Pe is suggested to exceed a critical value Pec at each ?Ts to avoid the convection-limited regime. Beyond Pec, the CO2 capture rate (vc) grows monotonically with ?Ts, indicating a desublimation-limited regime. In the packed bed case, multiple grains render the convective CO2 supply insufficient and make CCC operate under the convection-limited mechanism. Besides, in small-?Ts and high-Pe tests, CO2 desublimation becomes insufficient compared with convective CO2 supply, thus introducing the desublimation-limited regime with severe CO2 capture capacity loss ({\ensuremath{\eta}}d). Moreover, large {\ensuremath{\psi}} enhances gas mobility while decreasing cold grain volume. A moderate porosity {\ensuremath{\psi}}c is recommended for improving the CO2 capture performance. By analysing vc and {\ensuremath{\eta}}d, regime diagrams are proposed in ?Ts-Pe space to show distributions of convection-limited and desublimation-limited regimes, thus suggesting optimal conditions for efficient CO2 capture. This work develops a viable LB model to examine CCC under extensive operating conditions, contributing to facilitating its application.},
             url = {https://doi.org/10.1017/jfm.2024.351},
          author = {Lei, Timan and Luo, Kai H and Perez, Francisco E Hernandez and Wang, Geng and Yang, Junyu and Cano, Juan Restrepo and Im, Hong G}
}