The Effect of the Variation of the Downstream Region Distance and Butterfly Valve Angle on Flow Characteristics in a 90 Degree Bended Elbow - Modern Mechanical Engineering

MME > Vol.4 No.3, August 2014

The Effect of the Variation of the Downstream Region Distance and Butterfly Valve Angle on Flow Characteristics in a 90 Degree Bended Elbow ()

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DOI: 10.4236/mme.2014.43013 3,622 Downloads 4,528 Views Citations

Author(s)

Se Youl Won, Jae Gon Lee, Jun Seok Yang

Affiliation(s)

Central Research Institute, Korea Hydro & Nuclear Power Co., Ltd., Daejeon, Korea.

ABSTRACT

This study presents the numerical evaluation about the impact of flow disturbance near the intrados and extrados regions of the 90 degree bended elbow using CFX for several practical cases where the 90 degree bended upward elbow is located in a proximity to the butterfly valve and the butterfly valve open angle is changed. For the change of a butterfly valve open angle from 60% to 100% and the increase of the distance between a valve and a 90 degree bended elbow, the effect of FAC (Flow-Accelerated Corrosion) in the 90 degree bended elbow may be neglected because the value and distribution of the velocity and shear stress is rapidly decreased comparing with the present status installed in an industry, and the data of 100% valve open (Case 3) and L/D ≈ 5 (Case 4) are very good agreement comparing with the reference data, L/D ≈ 8 (Case 2). The reasons are that flow already maintains a fully developed condition and a steady state in spite of less distance than the reference case, L/D = 8. Therefore, smooth flow fields have approached at a 90 degree bended elbow. Then, the effect of shear stress and vortex is hardly investigated around the intrados area of 90 degree bended elbow.

KEYWORDS

Flow Disturbance, Shear Stress, 90 Degree Bended Elbow, Butterfly Valve, FAC

Share and Cite:

Won, S. , Lee, J. and Yang, J. (2014) The Effect of the Variation of the Downstream Region Distance and Butterfly Valve Angle on Flow Characteristics in a 90 Degree Bended Elbow. Modern Mechanical Engineering, 4, 133-143. doi: 10.4236/mme.2014.43013.

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