Актуальные проблемы в машиностроении. Том 13. № 1-2. 2026 Технологическое оборудование, оснастка и инструменты ____________________________________________________________________ 53 EVALUATION OF THE THERMO‑HYDRAULIC EFFICIENCY OF RIBLETS IN TURBULENT FLOW OF TUBULAR COMPONENTS Zaides S. A.¹, Ph.D. (Engineering), Professor, e-mail: zsa@istu.edu Tran T. D.¹, Post-graduate Student, e-mail: trantuandung98@gmail.com Nguyen Q. T.², Master of Engineering sciences, Senior Lecturer, e-mail: tuanqn978@gmail.com Vu D. Tr.², Senior Lecturer, e-mail: ductrong120280@gmail.com 1Irkutsk National Research Technical University, 83 Lermontov St., Irkutsk, 664074, Russian Federation ²Ngo Quyen University, 13, Bach Dang, Ho Chi Minh, Viet Nam Abstract This paper presents a study on the effect of rectangular riblets with a height of h = 1 mm and height‑to‑width ratios (h/t) on the reduction of hydraulic losses and heat transfer, in comparison with a smooth surface and surfaces with micro‑roughness heights of 0.2, 0.3, 0.4, and 0.5 mm, under fully developed turbulent flow conditions in tubular components with a diameter of 50 mm. The study was conducted based on CFD simulation results using Ansys Fluent 19.1 R2, applying periodic boundary conditions. The results indicate that the investigated riblets demonstrate high efficiency in reducing hydraulic losses, achieving a 2.6% reduction in flow resistance compared to a smooth surface. At the same time, the thermo‑hydraulic performance factor of these riblets is 1.86 times higher than that of a smooth surface. Keywords heat transfer, hydraulic losses, turbulent flow, Reynolds number, rectangular riblets
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