Effect of Concentric Annular Gap Flow on Wall Shear Stress of Stationary Cylinder Pipe Vehicle under Different Reynolds Numbers

Figure 8

Velocity measuring point arrangement. Note: r₁ = d_c + 1/5L = 42 mm, r₂ = d_c + 2/5L = 44 mm, r₃ = d_c + 1/2L = 45 mm, r₄ = d_c + 3/5L = 42 mm, and r₅ = d_c + 4/5L = 48 mm; d_c represents the radius of the cylinder pipe vehicle.