The processes of dehydration and granulation are associated with the heat transfer to solid particles from gas coolant, which acts as a fluidizing agent causes stochastic movement granular material in apparatus. To implement layered structure mechanism organic-mineral fertilizers it is necessary ensure intensive circulation gradual passage through appropriate technological zones main problem lo...

Fluidized beds can be used to gasify biomass in the production of producer gas, a flammable gas that can replace natural gas in process heating. Modeling these reactors with computational fluid dynamics (CFD) simulations is advantageous when performing parametric studies for design and scale-up. From a computational resource point of view, two-dimensional simulations are easier to perform than ...

We use a dynamic finite-difference model to simulate martian landslides in the Valles Marineris canyon system and Olympus Mons aureole using three different modal rheologies: frictional, Bingham, and power law. The frictional and Bingham modes are applied individually. Fluidized rheology is treated as a combination of frictional and power-law modes; general fluidization can include pore pressur...

Convection and fluidization phenomena in vibrated granular beds have attracted a strong interest from the physics community since the last decade of the past century. As early reported by Faraday, the convective flow of large inertia particles in vibrated beds exhibits enigmatic features such as frictional weakening and the unexpected influence of the interstitial gas. At sufficiently intense v...

Gas fluidization is widely used in industries and has been extensively studied either experimentally or mathematically. Recently, the coupled approach of discrete particle simulation (DPS) for solid phase and computational fluid dynamics (CFD) for gas phase has been proposed to study the heat transfer in fluidized beds at a particle level. The approach offers a convenient way to study the effec...

Vibration of gas-solid fluidized beds is often used to enable fluidization cohesive particles; however, it has also been shown reduce the minimum velocity (Umf). Here, we show via experiments that vibration can both Umf and bubbling (Umb) in Geldart Group B D particles. We observe reduced more than Umb, thereby creating a densely packed, bubble-free state when superficial gas between Umb. Umb d...

In modeling heat transfer in gas-solid processing systems, five interphase thermal processes are to be considered: gas-particle, gas-wall, particle-particle, particle-wall and wall-environment. In systems with intensive motion of particles, the particle-particle and particle-wall heat transfers occur through inter-particle and particle-wall collisions so that both experimental and modeling stud...

Though discrete particle simulation (DPS) has been widely used for investigating gas-solid flows from a more detailed level as compared to traditional two-fluid models (TFM), it is still seriously limited by the computational cost when large scale systems are simulated. GPUs (graphic processing units), with their massive parallel architecture and high floating point performance, provide new pos...

In the present work an attempt has been made to study the effect of the twisted tapes as bed internals, on the performance of the gas-solid fluidized beds. Experimental investigation has been carried out in cylindrical column with and without twisted tapes. Twelve numbers of twisted tapes of three different widths with four values of the twist ratios for each width were studied at different...

In recent years, the discrete element method (DEM) has gradually been applied to traditional fluidization simulation of fine particles in a micro fluidized bed (MFB). The application DEM simulating fast MFB not yet received attention. This article presents drag model that relies on surrounding environment particles, namely particle circumstance-dependent or PCDD model. Fast an is simulated usin...