What is Flowmeter: Definition and 20 Discussions

Flow measurement is the quantification of bulk fluid movement. Flow can be measured in a variety of ways. The common types of flowmeters with industrial applications are listed below:

a) Obstruction type (differential pressure or variable area)
b) Inferential (turbine type)
c) Electromagnetic
d) Positive-displacement flowmeters, which accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow.
e) Fluid dynamic (vortex shedding)
f) Anemometer
g) Ultrasonic
h) Mass flowmeter (Coriolis force).Flow measurement methods other than positive-displacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area. For very large flows, tracer methods may be used to deduce the flow rate from the change in concentration of a dye or radioisotope.

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  1. Dario56

    What determines the pressure inside this experimental setup?

    I have two gas tanks of nitrogen and oxygen. Mixture of gases is created and used in the system of interest. Let's say I want to create an atmospheric conditions in my system, mass ratio of oxygen to nitrogen is 0.3 and total pressure of 1 bar (oxygen partial pressure 0.21 bar). Therefore, mass...
  2. C

    Understanding Backpressure Effects on Flow Meter Calibration

    Hello all, I have an in-house designed flow meter with roughly the configuration in the figure. In the setup, a restriction is placed in the flow stream (the rows of horizontal lines in the figure). Pressure measurements upstream and downstream of the restriction, P1 and P2, respectively are...
  3. T

    Electrodes liquid contact electromagnetic flow meter?

    Hello, I'm interested in building a small non-invasive battery powered device that wraps around a pressured 1/2" pipe for measuring potable water. From https://en.wikipedia.org/wiki/Magnetic_flow_meter and watching youtube videos, it seems they all use electrodes which contact the liquid...
  4. akhan90

    Calculating the equation for a float in a rotameter

    I'm trying to design a rotameter, a flowmeter consisting of a float in a tube of increasing area (like a cone). I know the equations equating drag with gravity, but I'm more interested in the equation of the float's velocity over time, just as steady state flow begins (so x(0)=0) Because the...
  5. R

    Is an Automated Tapping Device the Solution to My Flowmeter Issue?

    I am looking for some device that can emulate someone tapping with a wrench every 20 minutes. More specifically, I have noticed that in my application, my flowmeters (rotameters) are dropping over time. As a workaround I have been able to tap them with a wrench every 20 to 30 minutes, this...
  6. A

    Can temperature affect the mass of water

    Hi there guys, I'm conducting an experiment to calculate the mass flow rate of water. Bellow is a copy of the procedure: 1) Weigh the mass in kg of a container 2) Connect a flow meter to a tap (any source) with a pipe and insure the departure pipe goes into a sink 3) Open the tap an increase...
  7. F

    Flowmeter Impact from Changing Pressure

    I have an argon piping system. The pressure is set at 50 psi. Assume no pressure drop. I have a flowmeter that is calibrated to run at 25 psi. Basically, I want to know what the "new" scale will be on the flowmeter as a result of the increased pressure (from 25 to 50 psi). In other words...
  8. P

    Pipe Flow Rate: Guarantee Constant Volumetric Flow

    I have a pipe with regular diameter connected to a tap, the water comes from public supply, I assume that public supply can vary on pressure and flow rate. How can I guarantee that I allways get the same volumetric flow rate at the end of the pipe? Will a pressure reducer be sufficient? Thank you!
  9. D

    Flowmeter Problems: Investigating a 12l/min Difference

    Hi there, I am currently doing leak testing for a piece of equipment. In order to do so I have a flowmeter at the inlet and outlet (of what is essentially a long cylinder) and have air drawn through by a vacuum pump. Now, the problem is that even with no obvious signs of leaks the two flows...
  10. R

    Can a Flow Meter with Wide Scale Graduations Have Accurate Repeatability?

    Can a flow meter whose scale has graduations only 2 units apart (e.g. 90,92,94,96,98,100) have a legitimate advertised repeatablity of 0.5% of the Full Scale? The scale runs 0 to 100 so that'd mean readings repeatable within 0.5%. When marks itself are 2 units apart how does this make sense...
  11. M

    Have You Explored Orifice Plate FlowMeters in Pipe Research?

    Hello People, I was just wondering if any of you done any similar investigation on the following topic. Basically, i currently doing a research on orifice plate in a pipe. It would be great if you guys know any journals that i can refer to.
  12. J

    Backpressure Compensation in Variable Orifice Flowmeter

    Hello, I guess this is something of a fluid dynamics problem. I'm having some trouble understanding non-backpressure compensated variable orifice flowmeters (NBPCVOF) used with medical gas tanks. Regarding a non-backpressure compensated flowmeter, I'm being told that adding partial...
  13. J

    Design of a turbine flowmeter to measure beer

    I've been given a project to improve the design of a turbine used to measure the flow of beer! I've trawled the web and libraries to find previous work in the hope of finding some handy pointers, rules of thumb and simple equations to guide me. However, I've had little joy. Basic parameters...
  14. V

    Fluid motion in venturi flowmeter

    Homework Statement The venturi flowmeter is used to measure the flow rate of water in a solar collector system. The flowmeter is inserted in a pipe with diameter 1.9cm; at the venturi of the flowmeter the diameter is reduced to 0.64cm. The manometer tube contains oil with density 0.82 times...
  15. E

    Adjust full scale in an orifice flowmeter

    Hi everybody! I hope somebody can help me... We are using a plate orifice to measure water feed to a reboiler; the pipeline size is 1" and the orifice was initially designed for 0-1800 kg/h of water, with a maximum pressure drop of 1000 mm water. As water feed doubles may I simply change...
  16. B

    Simple Mechanical Flowmeter Design for Self-Measurement of Urine Flow Rate

    Hello :) For a undergrad design course I'm asked to design and manufacture a device for measuring the peak urine flow rate to indicate possible signs of prostrate cancer. Basically, the allocated budget is too low to use any electronics (transducers and data acquisition), which was my initial...
  17. R

    How do I state uncertainty when calibrating a flowmeter?

    Hi, I'm having a lot of trouble trying to set up a process for calibrating turbine flowmeters for use in fuel rigs. Basically, I have a calibrated "master" flowmeter in series with the uncalibrated turbine flowmeter. I need a process that will give me the line of best fit across the...
  18. R

    Troubleshooting Turbine Flowmeter Calibration

    Hi, I'm having a lot of trouble trying to set up a process for calibrating turbine flowmeters for use in fuel rigs. Basically, I have a calibrated "master" flowmeter in series with the uncalibrated turbine flowmeter. I need a process that will give me the line of best fit across the...
  19. M

    Which lead has a higher potential in this electromagnetic flowmeter calculation?

    An electromagnetic flowmeter is used to measure blood flow rates during surgery. Blood containing Na+ ions flows due south through an artery with a diameter of 0.40 cm. The artery is in a downward magnetic field of 0.25 T and develops a Hall voltage of 0.35 mV across its diameter. (a) What is...
  20. T

    What is causing the arcing in our hydraulic flowmeter?

    I think my situation below can only be explained by a physicist, so I hope I came to the right place! On our hydraulic test bench we use a glass tube, float type flowmeter (also called a rotameter?); fluid is hydraulic fluid and non-flammable; the float is anodized aluminum. We occasionally...