CFD-DEM Simulation of a Conical Spouted Bed Operating with High Density Particles

Golshan, Shahab
Zarghami, Reza
Mostoufi, Navid
Külah, Görkem
The hydrodynamics of a spouted bed operating with high density zirconia particles was studied by CFD-DEM simulations. The model was validated by experimental data. Simulation results were used to obtain radial and axial profiles of the particle velocity, solid hold-up and flux in the bed at two bed heights. The gas jet velocity profile in the spout was also studied. For calculation of the solid circulation time in the bed, axial positions of 50 particles were traced in time. The mean solids circulation time in the bed was found to be 1.5 s.


CFD Simulations of Hydrodynamics of Conical Spouted Bed Nuclear Fuel Coaters
Lule, Senem Senturk; Çolak, Üner; KÖKSAL, MURAT; Külah, Görkem (2015-06-01)
The ability of the two fluid method (TFM) to predict the gas-solid flow phenomenon in conical spouted beds operated with high density (6050kgm(-3)) particles simulating the nuclear fuel coating conditions is investigated. The effects of geometric and operational factors, such as conical angle and static bed height, are also assessed. The results show that TFM predicts the time-averaged bed pressure drop quite well. The qualitative variation of the particle velocity, solids volume fraction, and axial particl...
Characterization of gas-solid flow in conical spouted beds operating with heavy particles
Sari, Salih; Külah, Görkem; KÖKSAL, MURAT (2012-07-01)
This study presents the results of an experimental investigation of the hydrodynamics of conical spouted beds operating with high density particles. This type of spouted beds is frequently encountered in chemical vapor deposition coating of nuclear fuel elements. Measurements were performed in three 15 cm ID full circular (gamma = 30 degrees, 45 degrees, 60 degrees) and one half circular conical spouted (gamma = 30 degrees) bed with yttria-stabilized zirconia particles (d(p) = 0.5, 1 mm; rho(p) = 6050 kg/m(...
Early Detection of Agglomeration in Conical Spouted Beds Using Recurrence Plots
Savari, Chiya; Külah, Görkem; Sotudeh-Gharebagh, Rahmat; Mostoufi, Navid; KÖKSAL, MURAT (2016-07-06)
The agglomeration of particles in a conical spouted bed was investigated using a recurrence plot (RP) and recurrence quantification analysis (RQA) of the pressure fluctuations (PFs) and acoustic emission (AE) signals. Experiments were carried out in a 45 degrees conical spouted bed with sugar particles (d(P) = 720 mu m; rho(p) = 1580 kg/m(3)). Water was sprayed incrementally into the bed to produce agglomerates during the operation. Several recurrence quantification parameters were calculated during the agg...
Nanoscale Thermal Transport in Single, Bilayer Graphene, and Graphite
Gholivand, Hamed; Donmezer, Nazli (2016-10-12)
In this study, ab-initio calculations were performed to obtain phonon dispersions of single, bilayer graphene, and graphite structures. Using these dispersions single mode relaxation times, thermal conductivities, and mean free paths (MFPs) have been calculated. Finally, calculated variables were used to understand the effects of additional layers to thermophysical properties, phonon mode contributions to thermal conductivity, and the limits for ballistic-diffusive heat transfer of single, bilayer graphene,...
Flow structure characterization in conical spouted beds using pressure fluctuation signals
MOSTOUFI, Navid; Külah, Görkem; KÖKSAL, MURAT (2015-01-01)
Characteristics of the hydrodynamics of conical spouted beds were revealed by analyzing pressure fluctuation signals in the frequency domain. Experiments were carried out in spouted beds with three different cone angles (30 degrees, 45 degrees, 60 degrees) and high density spherical particles (rho(p) = 6050 kg/m(3)) with diameters of 0.5 or 1 mm. Different hydrodynamic structures in the movement of solids were identified by examining pressure fluctuations of the bed in the frequency domain. Peaks in the pow...
Citation Formats
S. Golshan, R. Zarghami, N. Mostoufi, M. KÖKSAL, and G. Külah, “CFD-DEM Simulation of a Conical Spouted Bed Operating with High Density Particles,” 2016, vol. 188, Accessed: 00, 2020. [Online]. Available: