Because of its position in the flow formula for Venturi meters, if the coefficient drops due to change in tolerance, tap effect or surface irregularities , the indicated flow rate will be higher than it actually is — this is called “over-registration.” If annular chambers are in use, the pressure produced by the high- ...
Why is venturi meter more accurate?
Because of its position in the flow formula for Venturi meters, if the coefficient drops due to change in tolerance, tap effect or surface irregularities , the indicated flow rate will be higher than it actually is — this is called “over-registration.” If annular chambers are in use, the pressure produced by the high- ...
Why is a Venturimeter more accurate than an orifice meter?
Whereas the orifice meter consists of a thin plate and a bore. The pressure loss in venturi meter is 10% while in the orifice meter the pressure loss is 50-60%. The coefficient of discharge in the venturi meter is 0.98 while in orifice meter it is 0.6. ... The cost of venturi meter is expensive than the orifice meter.
What are the advantages of venturi meter?
Advantages of venturi meter:
Its behaviour can be predicted perfectly . It can be installed vertically, horizontally, inclined. They are more precise and can be used for a wide range of flows. About 90% of the pressure drop can be recovered.
What is true for the venturi meter?
Venturi meters have no moving parts , and can function reliably and accurately for decades, with some examples in service for more than 100 years. To this end, Venturis should be would render other devices ineffective. ... Typically, the energy loss through a Venturi meter is between 0.10 to 0.25 psig.
What is the advantage and disadvantage of Venturi meter?
Advantages and disadvantages of Venturi meter
Smooth construction and low cone angle help to solid particles flow through it . So it can be used for dirty fluids. It can be installed in any direction horizontal, vertical and inclined. More accurate than orifice and flow nozzle.
What is the purpose of a Venturi?
Venturi are used to measure the speed of a fluid , by measuring the pressure changes from one point to another along the venture. A venturi can also be used to inject a liquid or a gas into another liquid.
How accurate is a Venturi meter?
Note that by default, Venturi flow meters offer an accuracy of around ±1% of the discharge coefficient . Optimum calibration allows an even greater accuracy of up to ±0.25%. Venturi nozzle flow rate measurement systems are marginally more expensive than orifice-style flow meter systems.
Which is the cheapest device for measuring flow rate?
Explanation: Orificemeter is the cheapest available device for measuring flow/discharge rate. 2. The principle of Orificemeter is same as that of Venturimeter.
What are the applications of Bernoulli’s Theorem?
- (i) Lift of an aircraft wing. A section of an aircraft wing and the flow lines are shown in Fig. ...
- (ii) Blowing of roofs. During a storm, the roofs of huts or tinned roofs are blown off without any damage to other parts of the hut. ...
- (iii) Bunsen burner. ...
- (iv) Motion of two parallel boats.
Which is better Venturi or orifice?
The Venturi meter can handle large range of flow rates of fluid than the Orifice meter but once the Venturi meter is installed the range of flow rates it can handle becomes fixed. ... Thus, Orifice meters offer much more flexibility of operation.
What are the advantage and disadvantage of turbulent flow?
A turbulent flow can be either an advantage or disadvantage. A turbulent flow increases the amount of air resistance and noise ; however, a turbulent flow also accelerates heat conduction and thermal mixing. Therefore, understanding, handling, and controlling turbulent flows can be crucial for successful product design.
Does a venturi increase pressure?
The Venturi effect states that in a situation with constant mechanical energy, the velocity of a fluid passing through a constricted area will increase and its static pressure will decrease . ... The change in velocity also affects the pressure of the fluid.
What is the basic principle of Venturi meter?
The principle behind the operation of the Venturi flowmeter is the Bernoulli effect . The Venturi measures a fluid’s flowrate by reducing the cross sectional flow area in the flow path and generating a pressure difference.
How do you calculate Venturi flow rate?
- Preview: Venturi Flow Calculator.
- and.
- Therefore:
- and.
- Q mass = ρ · Q. Where: Q = volumetric flow rate (m 3 /s, in 3 /s) Q mass = Mass flowrate (kg/s, lbs/s) A 1 = area = Π · r 2 (mm 2 , in 2 ) A 2 = area = Π · r 2 (mm 2 , in 2 ) r 1 = radius inlet at A 1 (mm, in) r 2 = radius inlet at A 2 (mm, in)
What are the main parts of Venturimeter?
- A short converging part: It is that portion of the venturi where the fluid gets converges.
- Throat: It is the portion that lies in between the converging and diverging part of the venturi. ...
- Diverging part: It is the portion of the venturimeter (venturi) where the fluid gets diverges.
