Fig. 3
From: Dynamic tuning of optical absorbers for accelerated solar-thermal energy storage
Theoretical modeling of the charging of paraffin-Fe3O4@graphene composites. a Simulation schematic of thermal charging (TC) process. A constant heat flux converted from laser illumination is applied as the fixed heat source to charge PCM via thermal diffusion. b Simulation schematic of optical charging (OC) process for the non-transparent solid paraffin composites. The whole sample is divided into numerous domains and is melted step by step. c Simulated temperature distribution profiles after charging for 30 s. d Simulation of solid/liquid interface propagation and comparison to experiments. The solid/liquid interface movement of thermally charged paraffin composites with a hypothetical thermal conductivity of 3 W m−1 K−1 (blue line) was simulated for comparison
