ANS:C - turbulent

When the Reynolds number for flow in a pipe is around 6000, the flow is generally considered to be in the transition region. Here’s an explanation:

• Reynolds Number (Re): The Reynolds number is a dimensionless quantity that characterizes the flow of fluid in a pipe or conduit. It is defined as the ratio of inertial forces to viscous forces within the fluid flow.
• Laminar Flow: Laminar flow occurs at low Reynolds numbers, typically below about 2000. In laminar flow, the fluid moves in smooth, parallel layers with minimal mixing between layers.
• Turbulent Flow: Turbulent flow occurs at higher Reynolds numbers, typically above about 4000. In turbulent flow, the fluid moves chaotically with significant mixing and eddy formation.
• Transition Flow: Transition flow occurs in the Reynolds number range between approximately 2000 and 4000. It represents a region where the flow characteristics are changing from laminar to turbulent. Flow in the transition region can exhibit intermittent fluctuations and is sensitive to disturbances.