Numerical study on the gas-solid hydrodynamics and heat transfer in a rotating fluidized bed with static geometry dryer. (June 2020)

• Record Type: Journal Article
• Authors: Singh, Pavitra; Mahanta, Pinakeswar; Kalita, Pankaj
• Is Part Of: International journal of heat and mass transfer. Volume 153(2020)
• Publication Date: 2020-06
• Subjects: RFB-SG -- Fluidization -- Without slits -- Solid-bed, ANSYS FLUENT 14.5; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2020.119666
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Particle fluidization capacity and its behavior in a RFB-SG reactor have been predicted. Gas-solid temperature distribution at various velocities has been analyzed numerically. By enhancing air velocity, higher heat transfer takes place through solid-bed region. Prediction of numerically examined set up is expected to be beneficial in the scaled-up physical model. Abstract: In the present study, a three-dimensional computational fluid dynamics (CFD) simulation is carried out to investigate the gas-solid fluidization behavior and heat transfer characteristics in a rotating solid-bed with static geometry (RFB-SG) without slits. With a static geometry adit as the research objective, this paper makes use of the Eulerian–Eulerian approach to carry out numerical simulations in ANSYS FLUENT 14.5 software. The prediction of particle fluidization capacity and its behavior in the developed reactor has been analyzed, using appropriate parameters and simulation analysis. The results illustrated that the main factors, such as air inlet velocity, inlet pressure, temperature, and heat transfer coefficient, affected the reactor capacity. It is observed that for a solid inventory of 300 g, a well-stabled solid-bed has been obtained at an air velocity of 22 m s −1 . On enhancing the inlet air velocity up to 33 m s -1, not only the fluidization capacity of the reactor is increased by 500 g but also the drying efficiency is found to be increased. On validating numerical results with experimental findings, the maximum error of temperature is found to be 6.98%.