그루브의 Trap 효과에 대한 CFD 해석:제2부 − 그루브 모서리의 곡률반경 변화
CFD Analysis of Trap Effect of Groove in Lubricating Systems:Part II – Variation in Radius of Curvature of Groove Edge
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Numerical investigation of the groove trap effect with variation in the groove-edge radius of curvature is presented here. The trap effect is evaluated in a two-dimensional sliding bearing using computational fluid dynamics (CFD). This simulation is based on the discrete phase model (DPM) and standard k - ε turbulence model using commercial CFD software, FLUENT. The numerical results are evaluated by comparisons with streamlines and particle trajectories in the grooves. Grooves are applied to various lubrication systems to improve their lubrication characteristics, such as load carrying capacity increment, leakage reduction, frictional loss reduction, and preventing three-body abrasive wear due to trapping effect. This study investigates the grove trapping effect for various groove-edge radius of curvature values and Reynolds numbers. The particle is assumed to be made of steel, with a circular shape, and is injected as a single particle in various positions. One-way coupling is used in the DPM model because the single particle injection condition is applied. Further, the “reflect” condition is applied to the wall boundary and “escape” condition is used for the “pressure inlet” and “pressure outlet” boundaries. From the numerical results, the groove edge radius is found to influence the groove trap effect. Moreover, the groove trap effect is more effective when applying the groove edge radius.
Abstract
Numerical investigation of the groove trap effect with variation in the groove-edge radius of curvature is presented here. The trap effect is evaluated in a two-dimensional sliding bearing using computational fluid dynamics (CFD). This simulation is based on the discrete phase model (DPM) and standard k - ε turbulence model using commercial CFD software, FLUENT. The numerical results are evaluated by comparisons with streamlines and particle trajectories in the grooves. Grooves are applied to various lubrication systems to improve their lubrication characteristics, such as load carrying capacity increment, leakage reduction, frictional loss reduction, and preventing three-body abrasive wear due to trapping effect. This study investigates the grove trapping effect for various groove-edge radius of curvature values and Reynolds numbers. The particle is assumed to be made of steel, with a circular shape, and is injected as a single particle in various positions. One-way coupling is used in the DPM model because the single particle injection condition is applied. Further, the “reflect” condition is applied to the wall boundary and “escape” condition is used for the “pressure inlet” and “pressure outlet” boundaries. From the numerical results, the groove edge radius is found to influence the groove trap effect. Moreover, the groove trap effect is more effective when applying the groove edge radius.
참고문헌 (8)
- 홍성호, "그루브의 Trap 효과에 대한 CFD 해석: 제 1부− 그루브 단면 형상의 변화", 한국트라이볼로지학회지, 32(3), pp.101~105 (2016), 한국트라이볼로지학회[DOI]
- Merritt, H. E., "Hydraulic Control Systems", pp.108~111 (1967), John Wiley & Sons, Inc
- Kaushal, D. R., "Experimental investigation on optimization of invert trap configuration for sewer solid management", Powder Technology, 215-216, pp.1~14 (2012)
- Buxton, A., "Developments in a methodology for the design of engineered invert traps in combined sewer systems", Water Science and Technology, 45(7), pp.133~142 (2002)
- Daoyin, L., "Development and test of CFD-DEM model for complex geometry : A coupling algorithm for FLUENT and DEM", Computers and Chemical Engineering, 58, pp.260~268 (2013)
- Kharoua, N., "Prediction of black powder distribution in junctions using the Discrete Phase Model", Powder Technology, 286, pp.202~211 (2015)
- FLUENT, "FLUENT 18.0 Manual", ~ (2019)
- Cho, J. I., "CFD analysis of trap effect of groove in lubrication systems-variation in radius of curvature of groove edge", Proc. Autumn Conf. Korean Tribol. Soc (2019)