Title:
High-Temperature Granular Flow Experiments and Analysis along a Stair Geometry for Solar Particle Receiver Applications Dataset
High-Temperature Granular Flow Experiments and Analysis along a Stair Geometry for Solar Particle Receiver Applications Dataset
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Author(s)
Bagepallii, Malavika V.
Jeong, Shin Young
Brooks, Joshua
Zhang, Zhuomin
Ranjan, Devesh
Loutzenhiser, Peter G.
Jeong, Shin Young
Brooks, Joshua
Zhang, Zhuomin
Ranjan, Devesh
Loutzenhiser, Peter G.
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Abstract
High-temperature, dense granular flows along a stair geometry were considered for application in concentrated solar receivers. A series of experiments was performed using sintered bauxite particles with inlet temperatures of ~600°C and ~800 °C. Mass flow rates were measured using a load cell. Changes in particle arial fraction was determined using high speed images and free-surface velocities were measured and computed using particle image velocimetry. Particle temperatures were measured using infrared cameras. Mass flow rate was steady during the experiment and did not change with temperature. Areal fraction decreased along the curtain flow direction due to increase in particle velocities. Particle velocities at curtain regions were in good agreement with theory. Average temperature decreased along the flow directions and were repeatable between experiments, with error within 1% deviation from the mean computed using a 95% confidence interval. Particle bed velocities at the stair geometry decreased with depth of layers due to shear forces from stagnant layers. The temperature of particle layers correlated well with velocities wherein inner, slow-moving layers were at lower temperatures compared to upper, fast-moving layers.
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This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) Agreement Number EE0008372
Date Issued
2022
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