Numerical analyses of high temperature dense, granular flows coupled to high temperature flow property measurements for solar thermal energy storage.

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From: Solar Energy(Vol. 213)
Publisher: Elsevier Science Publishers
Document Type: Report; Brief article
Length: 351 words

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Abstract :

Keywords High temperature particle flow; Solar particle heating receivers and reactors; Thermal energy storage; High temperature particle flow properties; Discrete element method; Inclined particle flows Highlights * Refractory granular media enable high temperature solar thermal energy storage. * High temperature granular flows are characterized with particle flow properties. * High temperature discrete element method models predict granular flow behavior. * High temperature flows are characterized with velocity and mass flux contours. Abstract 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. Author Affiliation: (a) George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA (b) Department of Mechanical and Aerospace Engineering, University of Dayton, Dayton, OH 45469, USA * Corresponding author. Article History: Received 9 July 2020; Revised 20 October 2020; Accepted 28 October 2020 Byline: Justin D. Yarrington (a), Malavika V. Bagepalli (a), Gokul Pathikonda (a), Andrew J. Schrader (b), Zhuomin M. Zhang (a), Devesh Ranjan (a), Peter G. Loutzenhiser [peter.loutzenhiser@me.gatech.edu] (a,*)

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Gale Document Number: GALE|A648932504