Which type of flow describes fluid particles that begin to mix in a zig-zag pattern?

Turbulent flow is characterized by fluid particles that exhibit chaotic and irregular movement, often resulting in a zig-zag or swirling pattern. In turbulent flow, the velocity of the fluid changes rapidly with time and position, creating eddies and vortices. This mixing is a fundamental characteristic of turbulent flow, making it distinct from other types of flow.

In contrast, laminated flow (often referred to as laminar flow) is smooth and orderly, where fluid particles move in parallel layers without significant mixing. Streamlined flow, which is a synonym sometimes used interchangeably with laminar flow, also lacks the chaotic movement seen in turbulent flow. Viscous flow refers to the behavior of a fluid in response to viscosity but doesn't specifically describe the mixing pattern of the flow. The zig-zag pattern resulting from mixing is inherently associated with turbulence, making it the correct answer in this context.