Fig. 2.

Master plot for effective thermal effusivity. Master plot of effective thermal effusivity for phase change materials measured in the literature and this work (references in brackets^{6, 34–37}). Results are confined to isotropic and ambient phase change materials (transition temperature T^* occurring between 20 and 40 °C), for which volume-specific latent heat and thermal conductivity are directly or indirectly reported. The four data points enclosed in the ellipse refer to this work for graphene-modified and pristine Ni and Cu foams infused with OD