A common method of measuring flow through an open channel is to measure the height of the liquid as it passes over an obstruction as a flume or weir in the channel. Common used is the Sharp-Crested Weir, the V-Notch Weir, the Cipolletti weir, the Rectangular-Notch Weir, the Parshall Flume or Venturi Flume .
What are obstruction type flow meters?
Obstruction flow meters operate by introducing a restriction in the cross sectional area of a flowing fluid . Restricting the flow area causes a pressure drop across the obstruction, this pressure drop is cause by a change in the fluids velocity.
What are the different types of flow measurement techniques?
- Mechanical Type Flow Meters.
- Pressure Based Flow Meters.
- Thermal Flow Meters.
- Vortex Flow Meters.
- Electromagnetic Flow Meters.
- Ultrasonic Flow Meters.
- Coriolis Mass Flow Meters.
Which flow measuring device does not cause obstruction to flow?
Explanation: Orifice plate, venture tube and flow nozzle all these devices are used for flow obstruction. Sphere can’t be used for flow obstruction. Explanation: An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting flow.
Does not use obstruction methods to measure flow rate?
A magnetic flowmeter is a volumetric flowmeter, which does not have any moving parts and is ideal for wastewater applications or any dirty liquid, which is conductive or water based. Magnetic flowmeters will generally not work with hydrocarbons.
What are the types of flow?
| Physiological occurrence Flow direction | Oscillatory laminar flow Accepted as a means of turbulence simulation using flow chambers Periodically changing | Turbulent flow Rare, during pathophysiological processes Changing |
|---|
How many types of flow transmitters are there?
Flow transmitters provide electrical outputs that are proportional to flow inputs. They use flow meters to measure the flow of liquids and gases. Flow transmitters use three basic types of meters : mass, volumetric, and velocity.
Which of the following are the flow measuring devices?
The devices are: 1. The Venturimeter 2. The Pitot Tube 3. Orifice Plate or Orifice Meter 4.
Which one of the following is most commonly used flow measurement transducer?
Pitot Tubes
The pitot tube are one the most used (and cheapest) ways to measure fluid flow, especially in air applications like ventilation and HVAC systems, even used in airplanes for speed measurent. The pitot tube measures the fluid flow velocity by converting the kinetic energy of the flow into potential energy.
Which of the following methods or apparatus are used for measurement of flow rate?
A flow meter (or flow sensor) is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid or a gas.
Which one of the following is NOT used for measuring flow in a pipe?
Explanation: Venturimeter is based on Bernoulli’s equation. 9. Orifice Meter can only be used for measuring rate of flow in open pipe like structure. Explanation: Orificemetre can only be used for measuring rate of flow in an enclosed pipe like structure.
Which of the following is are the example of creeping flow?
Examples of creeping flow include very small objects moving in a fluid , such as the settling of dust particles and the swimming of microorganisms.
Which instrument is used for flow measurement of gas or air?
A flow meter is a precision instrument that measures gas flow rate (or liquid flow) in a pipe.
Which of the following flow measuring device does not cause of obstruction to flow Mcq?
The correct answer is A, magnetic flowmeter . The output from a magnetic flowmeter is a linear signal that is proportional to the velocity of the flowing fluid.
What are the types of flow sensors?
- Mechanical (e.g. Turbine, Propeller, and Paddle Wheel)
- Electromagnetic.
- Ultrasonic.
What are the 3 types of flow?
- Steady and Unsteady Flow.
- Uniform and Non-Uniform Flow.
- Laminar and Turbulent Flow.
- Compressible and Incompressible Flow.
- Rotational and Irrotational Flow.
- One, Two and Three -dimensional Flow.
What are the three flow types?
- Steady and Unsteady flows: ...
- Uniform and Non-uniform fluid flow: ...
- Laminar, and Turbulent fluid flow: ...
- Compressible and Incompressible fluid flow: ...
- Rotational and irrotational Fluid flow: ...
- One, Two and Three-dimensional fluid Flow:
How many types of pressure transmitters are there?
There are four main types of pressure transmitters: absolute, gauge, differential pressure, and multivariable.
What are some examples of laminar flow?
- Blood Flow. The blood flowing in our veins undergoes laminar flow. ...
- Water Balloon. To observe the laminar flow in a water balloon, a square piece of tape is pasted on its surface. ...
- Aircrafts. ...
- Viscous Fluids. ...
- Rivers/Canals. ...
- Fountains. ...
- Taps. ...
- Smoke.
Which are the flow transmitter?
Electromagnetic flow transmitters are sensors with electrical transmission output for indication of liquid flow rate . Adjustable insertion length models are available. This liquid flow meter that uses a magnetic field to measure flow. Applications include municipal, industrial, irrigation, and conductive liquids.
Which device is used to measure the velocity of flow for high flows?
Detailed Solution. Explanation: A Venturimeter is a device used for measuring the rate of a flow of a fluid flowing through a pipe.
Which method is used to measure the flow rate of liquid?
To measure the flow rate of liquid THE FLOAT METHOD is used and it also known as cross sectional method.
Which of the following devices can be used for measuring torque?
Explanation: Dynamometers are the devices which are used to measure torque in rotating parts of machines, mainly torque of rotating shafts.
Which of the following device can be used to measure flow of air around an Aeroplane?
The device used is Anemometer .
Which device is used to measure the flow of gas?
gas meter , device for measuring the quantity or rate of flow of a gas. Types of gas meters (by operating principles) include displacement, velocity, head, thermal, acoustic, and tracer. An example of the displacement principle is the bellows-and-diaphragm gas meter (shown in the diagram).
Which instrument is used for flow measurement of gas or air Mcq?
Rotameter is a constant pressure drop variable area flowmeter. It measures the flow rate of liquid or gas.
Which of the following devices is not used to measure pressure?
Radiation devices have the advantage of not having to touch the material being measured. So the device can not be used to measure pressure.
Which device Cannot be used to measure fluid pressure?
Which of the following device cannot be used for measuring the pressure of a liquid? Explanation: pH meter is used for measuring pH value of a liquid, all other devices are used for measuring pressure.
What is meant by creeping flow?
The terminologies creeping flow, Stokes flow, or low Reynolds number hydrodynamics are used synonymously to refer to flows in which inertia is negligible compared to viscous and pressure forces. ... One application of creeping flow is to locomotion of microorganisms through a fluid .
Which instrument used to measure mean velocity of flow in a channel?
The most common method used by the USGS for measuring velocity is with a current meter . However, a variety of advanced equipment can also be used to sense stage and measure streamflow. In the simplest method, a current meter turns with the flow of the river or stream.
Which of the following devices Cannot be used for measurement of pressure?
Which of the following devices is not used for pressure measurement? Explanation: The devices used for the measurement of pressure is diaphragm gauge , strain gauge, pressure bellows, piezoelectric transducer, etc. The dynamometer is useful in agitation measurement and control. 9.
What is Couette flow in fluid mechanics?
In fluid dynamics, Couette flow is the flow of a viscous fluid in the space between two surfaces , one of which is moving tangentially relative to the other. The relative motion of the surfaces imposes a shear stress on the fluid and induces flow.
Is vortex flow laminar?
Once you create a vortex, it no longer behaves laminar . Though it has vorticity present in the flow mostly near wall region but the presence of the vortical structures need to have a spiraling streamline around it which is not the case in the laminar flow near the wall. Hence, it is treated as irrotational flow.
Which is the cheapest flow measurement device?
Explanation: Orificemeter is the cheapest available device for measuring flow/discharge rate.
