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Micromechanical origin of heat transfer to granular flow

Xintong Zhang1,*, Sarath Adapa1,*, Tianshi Feng1, Jian Zeng1, Ka Man Chung2, Clifford Ho3, Kevin Albrecht3, and Renkun Chen1,2,†

  • 1Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, California 92093, USA
  • 2Program in Materials Science and Engineering, University of California, San Diego, La Jolla, California 92093, USA
  • 3Concentrating Solar Technologies Department, Sandia National Laboratories, 1515 Eubank Boulevard SE, Albuquerque, New Mexico 87123, USA

  • *These authors contributed equally to this work.
  • †Corresponding author: rkchen@ucsd.edu
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Phys. Rev. E 109, L042902 – Published 15 April, 2024

DOI: https://doi.org/10.1103/PhysRevE.109.L042902

Abstract

Heat transfer across a granular flow is comprised of two resistances in series : near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contribution. Here, we use a frequency modulated photothermal technique to separately quantify the thermal resistances in the near-wall and the bulk bed regions of particles in flowing states. Compared to the stationary state, the flowing leads to a higher near-wall resistance and a lower thermal conductivity of bulk beds. Coupled with discrete element method simulation, we show that the near-wall resistance can be explained by particle diffusion in granular flows.

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Phys. Rev. E 109, L042902– Published 15 April, 2024
  • Received 18 November 2023
  • Accepted 18 March 2024
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