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Research Papers

Characterizing Effects of the Shape of Screw Conveyors in Gas–Solid Fluidized Beds Using Advanced Numerical Models

[+] Author and Article Information
Qingang Xiong, Soroush Aramideh, Alberto Passalacqua

Department of Mechanical Engineering,
Iowa State University,
Ames, IA 50011

Song-Charng Kong

Department of Mechanical Engineering,
Iowa State University,
Ames, IA 50011
e-mail: kong@iastate.edu

1Corresponding author.

Manuscript received April 17, 2014; final manuscript received May 30, 2014; published online March 17, 2015. Assoc. Editor: Giulio Lorenzini.

J. Heat Transfer 137(6), 061008 (Jun 01, 2015) (7 pages) Paper No: HT-14-1220; doi: 10.1115/1.4029864 History: Received April 17, 2014; Revised May 30, 2014; Online March 17, 2015

A numerical study of the effects of the shape of an enclosed screw conveyor on the mixing and heat transfer in a horizontal gas–solid fluidized bed was conducted using computational fluid dynamics (CFD). A two-fluid model (TFM) was employed to model the gas and solid phases as continua through mass, momentum, and energy conservations. The motion of the screw conveyor was simulated by using a rotating reference frame (RRF) such that the computational mesh was free from dynamic reconstruction. The diameters of the screw flight and shaft, the pitch, and the blade thickness were varied in the parametric study. Under the operating conditions studied, it was found that the increase in the diameter of the screw flight results in the enhancement of the solid mixing and conveyance. The increase in the diameters of the screw shaft and the screw blade thickness lead to the enhanced solid mixing but reduced conveyance. The variation in the screw pitch gives rise to rather complex behaviors in the solid mixing and conveyance. As the screw pitch is decreased, the solid mixing increases initially but then decreases before it increases eventually. The solid conveyance capability was found to first increase and then decrease. Explanations to the effects of the shape of the screw conveyor were discussed in this work.

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Figures

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Fig. 1

The configuration of the screw conveyor in the fluidized bed reactor

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Fig. 2

Movement of solid particle on the screw flight due to the partial-slip condition

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Fig. 3

Temporal evolution of the solid outflux for the case with dout = 0.02 m, din = 0.008 m, pc = 0.03 m, and tc = 0.003 m

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Fig. 4

Relationships of σs and Hs with dout. din = 0.008 m, pc = 0.03 m, and tc = 0.003 m

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Fig. 5

Relationships of σs and Hs with din. dout = 0.02 m, pc = 0.03 m, and tc = 0.003 m

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Fig. 6

Relationships of σs and Hs with pc. dout = 0.02 m, din = 0.008 m, and tc = 0.003 m

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Fig. 7

Relationship between the direction of particle movement and pc

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Fig. 8

Relationships of σs and Hs with tc. dout = 0.02 m, din = 0.008 m, and pc = 0.03 m

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Fig. 9

Comparison of the flow fields between the case with tc = 0.002 m and the case with tc = 0.005 m

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