Large eddy simulations of turbulent heat transfer in packed bed energy storage systems

The present paper aims to study the effect of partial blocking and flow regime on mutual turbulent interplay between porous non-porous regions in packed bed energy storage systems (PBESSs). To this end, high-fidelity pore-scale large eddy simulations (LES) are conducted for two PBESS configurations, namely full blockage under discharge process at three Re numbers 3600, 7200, 14,400. influences major features, including channelling leakage, rate heat transfer (Nusselt number) pressure drop investigated various Reynolds (Re) numbers. Results demonstrate that inside region strongly affects temperature profiles leads local maximum peaks Nusselt (Nu) number upper lower sides pore elements. For blockage, it is observed 79 % entering block leaks from into through porous-fluid interface = which reduces by 26 as increases leakage formation counter-rotating vortex pair structures over block. It also causes Nu elements changes stagnation points' position leading edge near interface. Compared configuration, less dependent case. Finally, drag force about 21.4 30.9 times 3600 14,400, respectively. Whereas these numbers, average nearly 51.2 57.3 higher than blockage. Consequently, entire fluid area may not necessarily be best design, since result excessive drops without significant enhancement.