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Loutzenhiser, Peter G.

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Author: Ranjan, Devesh × Author: Jeong, Shin Young ×

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    Experimental characterization of extreme temperature granular flows for solar thermal energy transport and storage - supplementary data
    (Georgia Institute of Technology, 2022) Bagepallii, Malavika V. ; Jeong, Shin Young ; Brooks, Joshua ; Zhang, Zhuomin ; Ranjan, Devesh ; Loutzenhiser, Peter G.
    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. A decrease in temperature was observed along the side walls due to a decrease in particle velocities.
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    Georgia Tech | Gen3 CSP Mechanical and Radiative Property Database
    (Georgia Institute of Technology, 2022) Loutzenhiser, Peter G. ; Ranjan, Devesh ; Zhang, Zhuomin ; Schrader, Andrew J. ; Pathikonda, Gokul ; Brooks, Joshua ; Bagepali, Malavika ; Chuyang, Chen ; Jeong, Shin Young ; Yarrington, Justin D.
    The focus of this work is to systematically characterize the heat transfer and flow properties for particulate (granular) flows at elevated temperatures up to 800 °C. This work is intended to address a serious gap within the field related to the understanding and modeling of particulate flow behavior and the related heat transfer at different temperatures, which directly correspond to the operating points of concentrated solar power applications that use particles for heat storage. These objectives will be accomplished using a combination of fundamental experimental measurements, modeling, and simplified flow experimentations over a range of temperatures. Ceramic sintered bauxite proppants will be used as a baseline for comparison with a range of other particles used for various applications. These results will be made available during the project to the research community to provide updated guidance and inputs to current modeling efforts to improve their results.
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    High-Temperature Granular Flow Experiments and Analysis along a Stair Geometry for Solar Particle Receiver Applications Dataset
    (Georgia Institute of Technology, 2022) Bagepallii, Malavika V. ; Jeong, Shin Young ; Brooks, Joshua ; Zhang, Zhuomin ; Ranjan, Devesh ; Loutzenhiser, Peter G.
    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.