TY - JOUR
T1 - Numerical analyses of high temperature dense, granular flows coupled to high temperature flow property measurements for solar thermal energy storage
AU - Yarrington, Justin D.
AU - Bagepalli, Malavika V.
AU - Pathikonda, Gokul
AU - Schrader, Andrew J.
AU - Zhang, Zhuomin M.
AU - Ranjan, Devesh
AU - Loutzenhiser, Peter G.
N1 - Publisher Copyright:
© 2020 International Solar Energy Society
PY - 2021/1/1
Y1 - 2021/1/1
N2 - High temperature particle flow properties necessary to predict granular flow behavior for solar thermal energy storage applications were measured and calculated for Carbobead CP 30/60 up to 800 °C. The measured properties included elastic and shear moduli, particle–particle coefficients of static sliding and rolling friction, and particle–particle coefficients of restitution. Poisson's ratio was calculated with elastic and shear moduli. The flow properties were used as inputs for a numerical model using the discrete element method to examine granular flows along an inclined plane at high temperature. The flow behavior was strongly influenced by the coefficients of static friction, which impacted the particle residence time, shear effects from the side walls, and particle flow mass flux. An 8.7%, 15.6%, and 8.5% increase and 37.9% decrease in steady state mass flow rate was observed for 200 °C, 400 °C, 600 °C, and 800 °C, respectively, when compared to room temperature simulations. A 52%, 59%, and 33% decrease in the time to reach steady state was observed for 200 °C, 400 °C, and 600 °C, respectively, while a 53% increase in time was observed for 800 °C. A significant delay in the flow development at 800 °C was observed due to significantly higher frictional forces.
AB - High temperature particle flow properties necessary to predict granular flow behavior for solar thermal energy storage applications were measured and calculated for Carbobead CP 30/60 up to 800 °C. The measured properties included elastic and shear moduli, particle–particle coefficients of static sliding and rolling friction, and particle–particle coefficients of restitution. Poisson's ratio was calculated with elastic and shear moduli. The flow properties were used as inputs for a numerical model using the discrete element method to examine granular flows along an inclined plane at high temperature. The flow behavior was strongly influenced by the coefficients of static friction, which impacted the particle residence time, shear effects from the side walls, and particle flow mass flux. An 8.7%, 15.6%, and 8.5% increase and 37.9% decrease in steady state mass flow rate was observed for 200 °C, 400 °C, 600 °C, and 800 °C, respectively, when compared to room temperature simulations. A 52%, 59%, and 33% decrease in the time to reach steady state was observed for 200 °C, 400 °C, and 600 °C, respectively, while a 53% increase in time was observed for 800 °C. A significant delay in the flow development at 800 °C was observed due to significantly higher frictional forces.
KW - Discrete element method
KW - High temperature particle flow
KW - High temperature particle flow properties
KW - Inclined particle flows
KW - Solar particle heating receivers and reactors
KW - Thermal energy storage
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U2 - 10.1016/j.solener.2020.10.085
DO - 10.1016/j.solener.2020.10.085
M3 - Article
AN - SCOPUS:85097759965
SN - 0038-092X
VL - 213
SP - 350
EP - 360
JO - Solar Energy
JF - Solar Energy
ER -