Wet fluidized bed granulation and coating processes have been widely used in the pharmaceutical food industries. The complex gas–solid flow coupled with heat mass transfer such made it hard to form complete control over apparatuses. To serve better design, scaling-up, optimization of granulators coaters, underlying micro-scale mechanisms must be clarified. Computational fluid dynamics discrete ...

the objective of this study was to examine the effects of the fluidized-bed drying me-thod on the final quality of two varieties of iranian rice, medium- and long grain. the re-sults were compared to that of paddy drying using a traditional method. rough rice was treated in the fluidized bed drier at 140ºc for 2 minutes. similar samples were dried for 8-10 hrs by the traditional method. dried s...

The objective of this work is to show a procedure for mesh generation in a fluidized bed using large eddy simulations (LES) of a filtered two-fluid model. The experimental data were obtained by [1] in a laboratory fluidized bed. Results show that it is possible to use mesh with less cells as compared to RANS turbulence model with granular kinetic theory flow (KTGF). Also, the numerical results ...

the presence of particles in liquid-solid fluidized beds enhances the bed heat transfer, because the movement of the particles leads to an increased turbulence in the system. moreover, the violent movement of the particles has a positive effect on fouling of the heat transfer surface. the aim of this investigation was to perform systematic measurements of bed voidage and heat transfer coefficie...

successful medical treatment, and one of the effective methods to improve the patient compliance is to improve the ingest ability of the medicine. Recently, selection of the pharmaceutical dosage forms and improvement of the ingest ability of medicines have begun to be taken into consideration during the design and development of solid medicinal forms for oral intake, from the viewpoint of impr...

In this paper, combustion of char in the riser of circulating fluidized bed was modeled using ASPEN PLUS. Since physical and chemical phenomena are involved in the process, the model integrates the two-phase hydrodynamic sub-model with the reaction sub-model derived from the literature. In the proposed model, the fluidized bed is divided into several sections and the behavior of each section wa...

This paper focuses on the determination of the solid circulation of a CFB gasification system with a dual fluidized bed concept and the distribution of the solid hold up at different fluidization conditions. A mathematical model of the riser was designed and implemented in a model of a dual fluidized bed system. This model contains routines for calculation of each section of the dual fluidized ...

Liquid injection in fluidized beds occurs well-established industrial processes as fluid coking, spray fluidzed bed granulation and condensed mode gas-phase polymerisation. These still suffer performance issues due to their complex nature, where liquid adds even more complexity. In this work, the effect of on temperature uniformity a pseudo-2D was studied using Infra-Red Thermography. The image...