Normally, we have laminar blood flow throughout the body except the flow in the heart and conducting airways of respiratory tree (due to excessive vessel branching).
The layer with the highest velocity is in the center of the vessels.
Heavier particles like unactivated neutrophils and platelets flow in the center of the vessel while lighter particles flow at the periphery. This is because the center of flow will have the least resistance while the periphery will have maximum resistance.
Activation of cells like neutrophils or platelets due to endothelial injury or inflammatory process will pull them toward the periphery and the 1st step of inflammation will occur.
Turbulent flow is a non-layered flow that creates murmur. This can be heard as bruits in narrowed vessels (e.g. atherosclerosis of renal artery). The high velocity of blood flow can also create turbulent flow and can cause bruits (e.g. anemia).