What causes head loss in venturi meter?
This high energy loss is due to the large drop in pressure due to friction. One reason the loss is higher than the other two flowmeters could be because friction is not only created from the wall of the pipe, but also from the float.
What is Venturi head?
The Venturi head was systematically varied and the corresponding flow rates of air and water are measured. It is found that the flow rate of water can be effectively varied by controlling the Venturi head.
How is venturi meter flow calculated?
Venturi Flow Equation and Calculator
- Preview: Venturi Flow Calculator.
- and.
- Therefore:
- and.
- Qmass = ρ · Q. Where: Q = volumetric flow rate (m3/s, in3/s) Qmass = Mass flowrate (kg/s, lbs/s) A1 = area = Π · r2 (mm2, in2) A2 = area = Π · r2 (mm2, in2) r1 = radius inlet at A1 (mm, in) r2 = radius inlet at A2 (mm, in)
What are the disadvantages of Venturi flow meters?
Disadvantages of venturi meter:
- They are large in size and, therefore, where space is limited, they can not be used.
- Initial costs, installation and expensive maintenance.
- Requires a long placement length.
- It can not be used in pipes of less than 7.5 cm in diameter.
- Maintenance is not easy.
What is total head loss?
The total head loss of a fluid as it moves through a fluid system is the sum of the elevation head, velocity head and pressure head losses. Head loss is unavoidable in real fluid systems containing liquids or gases.
What is Venturi flow?
A Venturi is a system for speeding the flow of the fluid, by constricting it in a cone shape tube. In the restriction the fluid must increase its velocity reducing its pressure and producing a partial vacuum. As the fluid leave the constriction, its pressure increase back to the ambient or pipe level.
What is C in Venturi meter?
Coefficient of Discharge of Venturimeter (Cd) The coefficient of discharge for Venturimeter, Cd is defined as the ratio of the actual flow rate through the venturi meter tube to the theoretical flow rate.
How do you calculate pressure in a Venturi meter?
Example – Kerosene Flow Through a Venturi Meter The pressure difference dp = p1 – p2 between upstream and downstream is 100 kPa (1 105 N/m2). The specific gravity of kerosene is 0.82. Upstream diameter is 0.1 m and downstream diameter is 0.06 m.
Does a Venturi increase pressure?
What is the main advantage of Orificemeter?
Listed below are the two primary uses of an orifice meter: It is used to measure the flow rate of fluids in their single state (i.e. gaseous state or liquid state). It can also be used to measure the flow rate of fluids in a mixed state (both gaseous and liquid states) such as, wet steam, or natural gas with water.
What is the size of a venturi flow meter?
Venturi flow meters offer high accuracy and reliability for flow measurement of pressurized line fluids, including liquids, gases, and steam, as well as high-viscosity line fluids, solids-bearing line fluids, and harsh or contaminated line fluids. Line Size: 1/2 to 144 inches. Line size: 4 to 96 inches.
What is the effective discharge coefficient of a venturi meter?
The effective discharge coefficient for venturi meters ranges from 0.9 to about unity (Streeter, 1951; American Society of Mechanical Engineers, 1983) with turbulent flow, and it varies with diameter ratio of throat to pipe.
How accurate are differential head flowmeters?
Differential Head Flowmeters This class of flowmeters includes venturi, nozzle, and orifice meters. When properly installed and used, these meters have a potential accuracy of “1 percent. These meters have no moving parts but use the principle of accelerating flow by some form of constriction.
What are the different types of HVT flow meters?
Venturi Flow Meters. 1 HVT-FV Fabricated Venturi. +/- 0.50% Uncalibrated Uncertainty. Low Loss, Municipal & Industrial Applications. 2 HVT-CI Cast Iron/ HVT-DI Ductile Venturi. 3 HVT-FI Fabricated Insert Venturi / HVT-PI Plastic Insert Venturi. 4 HVT-FC Rate of Flow Controller. 5 HVT-SMS Sealed Meter System.