If a bluff (non-streamlined) body is placed in a flow, vortices detach themselves at regular intervals from the downstream side as illustrated in the diagram below:
In flow measurement the vortex shedding frequency is usually a few hundred hertz (Hz). At Reynolds numbers over 103 the volumetric flowrate, Q, is directly proportional to the observed frequency of vortex shedding f, i.e.
Q = Kf
Where K is a constant determined by the pipe and obstruction dimensions.
The vortices manifest themselves as sinusoidal pressure changes which can be detected by a sensitive diaphragm on the bluff body or by a downstream ultrasonic beam.
Related: How to Connect a DP (Differential Pressure) Flow Sensor to a DP Transmitter
This flowmeter can work at low Reynolds numbers, has excellent turndown (normally 15:1) , no moving parts and minimal head loss.
Recommended: The Ultimate Guide to Electrical Maintenance
You can also read: Types of Sensors used in Measurement and Process Control
An Expert’s Guide to EV Load Management and NEC Compliance Smart EV charging control architectures…
Frequent power failures due to severe storms, aging grid infrastructure, and other unpredictable natural disasters…
The rise of smart devices and the Internet of Things (IoT) has revolutionised the way…
Battery technology has become essential to the global transition to sustainable energy, fundamentally changing transportation…
Hydraulic systems are built in such way that they are able to move large loads…
Image source: Unsplash Innovation in aerospace engineering is accelerating, driven by rising demands for safer,…
