\label{fig:problem_setup}(draft image): Particle types considered in this paper: (a) 3DOM (radiative properties taken from \cite{Wheeler_2014}\cite{Randrianalisoa_2014}, (b) randomly porous particles (radiative properties calculated herein), (c) a sphere made of an effective medium (radiative properties calculated using VAT and Lorenz–Mie theory.) (d) Physical setup for the radiative characterization of the particle clouds. Incident angles correspond to a 1000 sun input from the solar simulator described in \cite{Bader_2014a}, \cite{Leveque}