Turbulent Flow is best described as which of the following?

• A. A smooth laminar flow with constant pressure
• B. A static flow with no movement
• C. An irregular pattern of flow with random variations in pressure
• D. A choked flow in open channels

Answer: (C)

Turbulent flow is chaotic motion in a fluid, with velocity and pressure fluctuating in time and space and numerous eddies and vortices of different sizes forming and interacting. This irregular, random pattern of motion and pressure variations is exactly what characterizes turbulence, making the flow mix rapidly and transfer momentum and energy more unpredictably than smoother flows. In contrast, laminar flow is smooth and orderly, with fluid moving in parallel layers and a steady pressure field; static flow means no movement at all; and choked flow describes a compressible-flow condition limited by a constriction, not the chaotic nature of turbulence. Turbulence usually appears at higher Reynolds numbers when inertial effects dominate viscous damping.