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Numerical study of the hydrodynamics and heat transfer characteristics of gas–solid in a slit-less rotating fluidized bed in static geometry

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Abstract

A rotating fluidized bed in static geometry (RFB-SG) without slits is presented in this paper as a research objective. The concept of RFB-SG is highly beneficial in numerous industrial operations such as granular drying, particle coating, mixing, agglomeration, and combustion. In this study, a three-dimensional CFD model is developed using the commercial software ANSYS FLUENT 14.5, to investigate hydrodynamics and heat transfer characteristics of gas–solid in the vortex chamber. The analysis of the flow pattern of gas–solid and the prediction of fluidization capacity have been made, using appropriate parameters. The findings showed that the significant factors, such as inlet air velocity, solid-bed thickness, the volume fraction of solids, solids pressure, and heat transfer coefficient, influenced the reactor capacity. It is observed that the solid inventories of 300 and 500 g have been fluidized perfectly at inlet air velocities of 30 m s−1 and 44 m s−1, respectively. The overall operating and drying costs are found to be decreased due to the reduction in fluidization air requirements.

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Abbreviations

d p :

Particle mean diameter (m)

g :

Acceleration due to gravity (m s−2)

\(g_{\text{o,ss}}\) :

Radial distribution function

k :

Thermal conductivity (W m−1 K−1)

L c :

Characteristic length of the rectangular inlet (m)

Re :

Reynolds number (dimensionless)

T a :

Temperature of fluidization air (K)

T o :

Ambient temperature (K)

v a :

Velocity of the fluidizing air (m s−1)

v s :

Velocity of the solid (m s−1)

β :

Interphase momentum transfer coefficient (N s m−4)

\(\gamma_{{\uptheta{\text{s}}}}\) :

Dissipation of kinetic fluctuation energy (kg m s−3)

ε a :

Void fraction of air (dimensionless)

ε s :

Void fraction of solid (dimensionless)

ρ g :

Density of dry gas and solid (kg m−3)

ρ s :

Density of dry gas and solid (kg m−3)

μ g :

Dynamic viscosity of gas (Pa s)

μ s :

Dynamic viscosity of solid (Pa s)

μ s,,col. :

Collisional kinetic solids shear viscosity (kg m−1 s−1)

μ s,fric. :

Frictional solids viscosity (kg m−1 s−1)

\(\xi_{\text{s}}\) :

Solid bulk viscosity

\(\varphi\) :

Angle of initial fraction

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Authors and Affiliations

  1. Center for Energy, Indian Institute of Technology Guwahati, Guwahati, 781039, India

    Pavitra Singh, Pankaj Kalita & Pinakeswar Mahanta

  2. Department of Mechanical Engineering, National Institute of Technology Arunachal Pradesh, Yupia, 791112, India

    Pinakeswar Mahanta

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  1. Pavitra Singh
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Singh, P., Kalita, P. & Mahanta, P. Numerical study of the hydrodynamics and heat transfer characteristics of gas–solid in a slit-less rotating fluidized bed in static geometry. J Therm Anal Calorim 141, 2647–2656 (2020). https://doi.org/10.1007/s10973-020-10070-w

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