Akademik Veri Yönetim Sistemi
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING, 2024 (SCI-Expanded)
This study investigates the flow behaviour and performance of needle-type valves using experimental and numerical methods. Three distinct valve designs, including slotted-end, closed-end, and rounded-end were evaluated. Computational fluid dynamics (CFD) was used to model the flow patterns and pressure characteristics, which were validated against experimental data. The results indicate significant pressure drops even when the valves are fully open (100%). The flow coefficient analysis reveals that slotted-end valves exhibit a gradual throttling effect of up to 40% opening and consistent performance across various Reynolds numbers. In contrast, closed-end valves show abrupt changes in flow behaviour between 80% and 60% opening, with reduced flow control beyond 80%. Rounded-end valves struggle to regulate flow at reduced openings, leading to notable pressure drops due to sudden vortex formation. The slotted-end valve demonstrates superior flow control at 20% opening, directing higher velocities through narrow pathways and showing greater efficiency than the closed-end valve at lower openings. These findings have significant implications for industrial applications requiring precise flow regulation, reduced energy losses, and extended valve lifespans, such as in fluid control systems for manufacturing and energy sectors.