Manipulation of bumpy surface cylinders for flow control and heat transfer improvement

• DOI: 10.1016/j.ijft.2023.100435
• Publication Date: 2023-08-05T02:32:51Z
• Authors: Javad Farrokhi De...; Rani Taher; Mahmoud Khaled
• Keywords: Strouhal number

The present work aims at investigating laminar flow effects over bumped-surface circular cylinders Reynolds number ≤ 200. Three bumpy cylinder surfaces are considered and studied, comprising square, triangular, dimple surface shapes. placed on the upper of arranged between 0° 90° from front stagnation point cylinder. These angles include θ = 0○, 45○, 90○. characteristics, such as lift drag coefficients, well Strouhal Nusselt numbers, evaluated. For all three examined bump shapes, it is demonstrated that when 45°, amplitude coefficient smaller than larger angles. It also found 90°, magnitude about 40% test cases with 45°. dependent location leading critical angle bump's identified introduced, which θcm While minimum obtained once located maximum assessed approximately a 12% increment.