Coordination number and thermal conductivity predictions in hybrid-particle packed beds

Particle packed beds find wide applications and existences in thermochemical heat storage, thermal insulation and 3D-printing, while their thermal conductance performance could importantly affect these applications. In this work, a coordination-number model for hybrid-particle packed beds was firstly established, and then the thermal conductivity model was further derived with statistical method by considering size distributions of par-ticles in the bed. Comparisons between the model and available experiments turn out that the model could give sound predictions of coordination-number and thermal conductivities in both macro-and nano-particle packed beds. In nanoscale, influences of sizes of hybrid nanoparticles on thermal conductivity could be included by de-fining a special mean radius of particles, and a small mean radius of particles could cause a large space density of interparticle interfaces thus leasing to a small thermal conductivity. The model is expected to predict or under-stand the thermal conductivity of hybrid particle packed beds.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

A coordination-number model for hybrid-particle packed beds was established, and the thermal conductivity model was derived with statistical method. The model showed accurate predictions of coordination-number and thermal conductivities in particle packed beds.