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Vol. 155, Issue 8, August 2013, pp. 171-179

 

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Analysis and Numerical Simulation of the Stable Helical Vortex in TCP Flow in Vertical Screw Conveyor
 
1 Sun Xiaoxia, 2 Meng Wenjun

1 Mechanical Engineering College, Taiyuan University of Science and Technology, 030024, China

 1 Tel.: 18803510107, fax: 0351-6998032

1 E-mail: xiaxiaosun79@tom.com

 

Received: 16 May 2013   /Accepted: 12 August 2013   /Published: 20 August 2013

Digital Sensors and Sensor Sysstems

 

Abstract: The air in vertical screw conveyor creates flows such as Taylor-Couette-Poiseuille flow and turbulent flow with the increase of rotational speed of screw shaft. The stable helical vortex in TCP flow is beneficial to improve the transporting efficiency of granular materials. This paper described the N-S equations of incompressible steady flow (air) in vertical screw conveyor and deduced the distribution solution of velocity of stable helical vortex in TCP. And this paper also analyzed the relationship between the Reynolds number Re and parameters such as rotational speed of screw shaft, shaft diameter of screw shaft, screw pitch. Then this paper simulated different flows using FLUENT software and obtains the velocity vector chart and streamline chart with different rotational speed of screw shaft in vertical screw conveyor. The effect of simulation verified the correctness of theoretical analysis and recommended the critical Reynolds number Rec suitable for appearance of stable helical vortex in TCP flow in the conveyor.

 

Keywords: Vertical screw conveyor, Taylor-Couette-Poiseuille flow, Stable helical vortex, N-S equations.

 

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