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In vortex flow meter how can measure the frequency of
vortex generated by vortex flow meter
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Answer Posted / devendra_kushwaha27
In vortex flometer, it is natural phenomenon that if you
put an obstruction in the path of flow, automatically
vortex are generated. In this case the important point to
be observed is that the number of vortexes generated are
directly proportional to the velocity of the flowing fluid
but the distance between vortex to vortex remain constant,
while we have the formula v=F.lemda..... where the lemda is
defined as the distance between vortexes which is constant.
and velocity is directly proportional to frequency. Where
we can use several types of sensors to detect the vortexes,
such as piezo electric type sensor. when a vortex will hit
to the sensor the pulse is generated and by calculating the
number of pulses we can determine the velocity and then
flow. YOU can physically observe this case... ... but it is
to be needed to go near river and search the place where
the stones are up than water level. sit there and observe
the phenomenon it is better to of that place where the
depth of water is not more than 6 inch and flowing speed is
not much fast...... cisit that place daily and observe that
when the flowing speed is more that day the more vortexes
are generated
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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