Radiation absorption in a particle curtain exposed to direct high-flux solar irradiation

[+] Author and Article Information
Apurv Kumar

The Australian National University, Canberra, Australia

Jin-Soo Kim

CSIRO Energy, Newcastle, Australia

Wojciech Lipinski

The Australian National University, Canberra, Australia

1Corresponding author.

ASME doi:10.1115/1.4040290 History: Received October 04, 2017; Revised May 14, 2018


Radiation absorption is investigated in a particle curtain formed in a solar free-falling particle receiver. An Eulerian-Eulerian granular two-phase model is used to solve the two-dimensional mass and momentum equations by employing computational fluid dynamics (CFD) to find particle distribution in the curtain. The radiative transfer equation is subsequently solved by the Monte-Carlo (MC) ray-tracing technique to obtain the radiation intensity distribution in the particle curtain. The predicted opacity is validated with the experimental results reported in the literature for 280 and 697 µm sintered bauxite particles. The particle curtain is found to absorb the solar radiation most efficiently at flowrates upper-bounded at approx. 20 kg s-1 m-1. In comparison, 280 µm particles have higher average absorptance than 697 µm particles (due to higher radiation extinction characteristics) at similar particle flowrates. However, as the absorption of solar radiation becomes more efficient, non-uniform radiation absorption across the particle curtain and hydrodynamic instability in the receiver are more probable.

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