(362e) Comparative Study of Spouted Bed Hydrodynamics Based On Dimensionless Approach Using Optical Probes and CFD

Authors: 
Aradhya, S., Missouri University of Science and Technology
Muthanna, A., Missouri University of Science and Technology


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Comparative Study of Spouted Bed Hydrodynamics Based on Dimensionless Approach using Optical Probes and CFD

 

*Shreekanta B Aradhya, #Xingying Lan and   *+Muthanna Al-Dahhan

*Department of Chemical & Biological Engineering

+Department of Nuclear Engineering

Missouri University of Science & Technology, Rolla, MO – 65409, USA

#State Key Laboratory of Heavy Oil Processing, China University of Petroleum, P.R China - 102249

Email: sba2p4@mst.edu

 

 

 

Dimensional analysis has been used as a tool to develop a set of scaling parameters for proper design of fluidized beds. He et al. (1997) modified the scaling factors for fluidized beds proposed by Glicksman (1984) to provide a set of scaling parameters for the similarity behavior of spouted beds by adding the internal friction angle and the loose packed voidage. He et al. (1997) proposed the following controlling dimensionless parameters for a spouted bed: , , , , , sphericity of particles (), interfacial angle of particle (), loose peak voidage (), dimensionless particle size distribution, and dimensionless bed geometry. Using different spouted bed conditions that cover ambient and high temperature and pressure conditions and different particle types and sizes, He et al. (1997) demonstrated that close hydrodynamic similarity was maintained in the beds when these scaling parameters were closely matched.

     However, the scale-up methodology of dimensional analysis has been evaluated only based on global parameters such as dimensionless spout diameters, dimensionless fountain height, and pressure along the bed height. No detailed hydrodynamics evaluation has been performed or reported. This work will focus on assessing the several match and mismatch conditions (based on dimensionless groups) reported by He et.al (1997) by using advanced optical probes and by CFD simulations. The parameters will be evaluated with the help of CFD simulations and optical probe measurements, which will be compared not only based on global parameters, but also local parameters such as solids holdup, solids velocity and their fluctuations.