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

Justin D. Yarrington, Malavika V. Bagepalli, Gokul Pathikonda, Andrew J. Schrader, Zhuomin M. Zhang, Devesh Ranjan, Peter G. Loutzenhiser

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)350-360
Number of pages11
JournalSolar Energy
Volume213
DOIs
StatePublished - Jan 1 2021
Externally publishedYes

Keywords

  • Discrete element method
  • High temperature particle flow
  • High temperature particle flow properties
  • Inclined particle flows
  • Solar particle heating receivers and reactors
  • Thermal energy storage

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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