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Numerical Study on the Turbulent Flow in the 180^{\circ}$ Bends Decreasing Cross-sectional Aspect Ratio  

김원갑 (국민대학교 자동차공학전문대학원)
최영돈 (고려대학교 기계공학과)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.14, no.12, 2002 , pp. 1056-1062 More about this Journal
Abstract
This paper reports the characteristics of the three dimensional turbulent flow in the 180 degree bends with decreasing cross-sectional area by numerical method. Calculated pressure and velocity, Reynolds stress distributions are compared to the experimental data. Turbulence model employed are low Reynolds number k-epsilon model and algebraic stress model. The results show that the main vortex generated from the inlet part of the bend maintained to outlet of the bend because of the contraction of cross-sectional area. The rate of increase of turbulent kinetic energy through the bend are lower than that of mean flow. Secondary flow strength of the flow is lower about 60% than that of square duct flow.
Keywords
Duct flow; Reynolds stress; Turbulence model; Covariant velocity component;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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