Title: Using CFD to derive reduced order models for heat transfer in particle curtains

Authors: Sepideh Afshar; Madoc Sheehan; Amir Fazlollahi

Addresses: Department of Chemical Engineering, James Cook University, Townsville, Queensland 4811, Australia ' Department of Chemical Engineering, James Cook University, Townsville, Queensland 4811, Australia ' Laboratoire Le2I, Université de Bourgogne, Le Creusot, France

Abstract: 3-D Eulerian-Eulerian CFD is used to simulate convective heat transfer in free falling particle curtains. Total heat loss for curtaining particles is compared to heat loss for isolated single particles. Spherical silica particles with density of 2,634 kg/m³ at 400 K (200 µm, 400 µm and 600 µm) flow at approximately 0.041 kg/s to 0.2 kg/s through a narrow slot in a rectangular box (0.45 m × 0.9 m × 0.225 m) filled with ambient air. The slot sizes through which the particles enter the rectangular box were 10 to 80 mm wide. Modifying the slot size at 0.041 kg/s for 400 µm particles can lead to 13% increases in rates of convective heat transfer per unit mass. A reduced order model was developed to predict the centreline temperatures of particles in the falling curtains. The drag coefficient in the ROM was varied to suit a range of particle sizes and mass flow rates.

Keywords: CFD; reduced order models; heat transfer; heat loss; particle curtains; computational fluid dynamics; convection; Eularian-Eularian; residence time; drag coefficient; particle size; mass flow rate; drying; simulation; silica particles.

DOI: 10.1504/PCFD.2015.068815

Progress in Computational Fluid Dynamics, An International Journal, 2015 Vol.15 No.2, pp.71 - 80

Published online: 13 Apr 2015 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article