The sensor is based upon the vortex flow measurement principle, which uses a bluff body
in the flow path to create small eddy currents (vortices) and the pressure of this current is measured to determine the flow through a given cross sectional area.
The devices use a bluff body
obstruction to produce vortices, and an electronic transducer measures these oscillations to provide a signal proportional to flow rate.
The problem encountered is somewhat different from the classical bluff body
flow in which the bluff body
In a vortex meter, the bluff body
is a piece of material with a broad, flat front that is mounted at right angles to the flowstream.
After presenting the physical aspects of the motion of a viscous fluid and the method of eigenfunction expansions, he presents sections on steady planar flows, steady three-dimensional flows, and unsteady flows, concluding with a section on external flows that includes chapters on external flows past bodies, planar bluff body
flows at low Reynolds numbers, and low Reynolds number flows past streamlined bodies.
The 17 papers in the 2008 volume of the respected annual series review multiscale models of gas-solid fluidized beds, tsunami simulation techniques, MRI applications in fluid mechanics, high- speed imaging of drops and bubbles, and control methods for flow over a bluff body
Vortex flowmeters place a device called a bluff body
into the flowstream.