Experimental characterization of extreme temperature granular flows for solar thermal energy transport and storage

Bagepalli, Malavika V.; Jeong, Shin Young; Brooks, Joshua D.; Zhang, Zhuomin M.; Ranjan, Devesh; Loutzenhiser, Peter G.

doi:10.1016/j.solmat.2022.112020

Experimental characterization of extreme temperature granular flows for solar thermal energy transport and storage

Journal Article · Fri Oct 07 00:00:00 EDT 2022 · Solar Energy Materials and Solar Cells

DOI:https://doi.org/10.1016/j.solmat.2022.112020· OSTI ID:2337437

^[1]; Jeong, Shin Young ^[2]; Brooks, Joshua D. ^[2]; Zhang, Zhuomin M. ^[2]; Ranjan, Devesh ^[2]; ^[2]

Georgia Institute of Technology, Atlanta, GA (United States); Georgia Institute of Technology
Georgia Institute of Technology, Atlanta, GA (United States)

High-temperature, dense granular flows along an inclined plane were considered for solar thermal energy transport and storage with sintered bauxite particles. A series of experiments was performed for particle inlet temperatures of ~ 200, 400, 600, and 800 °C to understand the mechanisms of granular flows at extreme temperatures. Mass flow rates were measured using a load cell and free-surface velocities were measured and computed using particle image velocimetry. Surface temperatures were measured using infrared cameras. A significant decrease in steady-state particle mass flow rate was observed with increasing temperature due to changing flow properties. A decrease in bulk particle free-surface velocities was observed at higher temperatures. Free-surface velocity measurement error between experiments were within 20% of the average. The particle surface temperatures decreased from inlet to outlet with larger gradients at higher temperatures observed due to increasing convection and radiative heat losses. Here, a decrease in temperature was observed along the side walls due to a decrease in particle velocities.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008372

OSTI ID:: 2337437

Journal Information:: Solar Energy Materials and Solar Cells, Journal Name: Solar Energy Materials and Solar Cells Vol. 248; ISSN 0927-0248

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Experimental characterization of extreme temperature granular flows for solar thermal energy transport and storage

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