Prediction of conductive heating time scales of particles in a rotary drum

Heather Emady, Kellie V. Anderson, William G. Borghard, Fernando J. Muzzio, Benjamin J. Glasser, Alberto Cuitino

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Modeling conductive heat transfer from rotary drum walls to a particle bed via discrete element method simulations, three time scales were determined: 1) the characteristic heating time of the bed, τ 2) the particle thermal time constant, τp; and 3) the contact time between a particle and the wall, τc. Results fall onto a monotonic curve of τ/τc vs. φ (τpc), with three heating regimes. At low φ, conduction dominates, and the system heats quickly as a solid body. At high φ, granular convection dominates, and the bed heats slowly at a nearly uniform temperature. At intermediate φ, the system heats as a cool core with warmer outer layers. The results of this work have important implications for improving the design and operation of rotary drums (e.g., energy-intensive calcination processes). By calculating τp and τc from material and operating parameters, the characteristic heating time, τ, can be predicted a priori.

Original languageEnglish (US)
Pages (from-to)45-54
Number of pages10
JournalChemical Engineering Science
Volume152
DOIs
StatePublished - Oct 2 2016

Fingerprint

Heating
Time Scales
Heat
Prediction
Discrete Element Method
Time Constant
Conduction
Monotonic
Convection
Heat Transfer
Finite difference method
Contact
Calcination
Curve
Heat transfer
Energy
Modeling
Hot Temperature
Simulation
Temperature

Keywords

  • Calcination
  • Catalyst manufacture
  • Conduction
  • Discrete element method
  • Heat transfer
  • Particle technology

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Applied Mathematics
  • Industrial and Manufacturing Engineering

Cite this

Emady, H., Anderson, K. V., Borghard, W. G., Muzzio, F. J., Glasser, B. J., & Cuitino, A. (2016). Prediction of conductive heating time scales of particles in a rotary drum. Chemical Engineering Science, 152, 45-54. https://doi.org/10.1016/j.ces.2016.05.022

Prediction of conductive heating time scales of particles in a rotary drum. / Emady, Heather; Anderson, Kellie V.; Borghard, William G.; Muzzio, Fernando J.; Glasser, Benjamin J.; Cuitino, Alberto.

In: Chemical Engineering Science, Vol. 152, 02.10.2016, p. 45-54.

Research output: Contribution to journalArticle

Emady, Heather ; Anderson, Kellie V. ; Borghard, William G. ; Muzzio, Fernando J. ; Glasser, Benjamin J. ; Cuitino, Alberto. / Prediction of conductive heating time scales of particles in a rotary drum. In: Chemical Engineering Science. 2016 ; Vol. 152. pp. 45-54.
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