Experimental validation of granular dynamics simulations of gas-fluidised beds with homogeneous inflow conditions using Positron Emission Particle Tracking

Share/Save/Bookmark

Hoomans, B.P.B. and Kuipers, J.A.M. and Mohd Salleh, M. and Seville, J.P. (2001) Experimental validation of granular dynamics simulations of gas-fluidised beds with homogeneous inflow conditions using Positron Emission Particle Tracking. Powder Technology, 116 . pp. 166-177. ISSN 0032-5910

[img] PDF
Restricted to UT campus only
: Request a copy
1MB
Abstract:A hard-sphere granular dynamics model of a two-dimensional gas-fluidised bed was experimentally validated using Positron Emission Particle Tracking (PEPT). In the model the Newtonian equations of motion are solved for each solid particle while taking into account the particle¿particle and particle¿wall collisions. The gas phase hydrodynamics is described by the spatially averaged Navier¿Stokes equations for two-phase flow. A quasi two-dimensional (i.e. narrow) bed of 0.185-m width and 0.4-m height with homogenous inflow conditions at 1.5 umf was chosen as a test case. Glass particles (¿p=2435 kg/m3) with diameters ranging from 1.25 to 1.5 mm were used as the bed material. The collision parameters required in the simulation were obtained from separate, independent measurements. In the PEPT experiment, the motion of a single tracer particle in the bed was tracked for 1 h. In the simulation, the motion of 15,000 particles was tracked for 45 s. The simulation data were time-averaged over 45 s for each particle and subsequently ensemble-averaged over all the particles in the simulation. The comparison was made on the basis of averaged velocity maps, "occupancy" plots and speed histograms. The results showed good agreement between experiment and simulation when the measured values for the collision parameters were used. When collisions were assumed to be fully elastic and perfectly smooth the agreement was much worse.
Item Type:Article
Copyright:© 2001 Elsevier Science B.V
Research Group:
Link to this item:http://purl.utwente.nl/publications/37283
Official URL:http://dx.doi.org/10.1016/S0032-5910(00)00391-0
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 204420