Why is Venturi meter accurate?
Impact of Materials on Accuracy As noted above, the body of the classical Venturi meter was made of either cast or ductile iron. The presence of this buildup will likely have an impact on the sensed pressure at the high- and low-pressure sensing points, which will affect the accuracy of the indicated reading.
How do you calibrate a Venturi meter?
The pressure drop is also plotted against the water flow rate. In order to calibrate flow meters specifically the venturi and orifice flow meters, a known volume of fluid is used to pass to measure the rate of flow of the fluid through the pipe.
Will it be more accurate to use a Venturi meter or an orifice meter for flow rate measurements?
This is the reason why orifice meters are less accurate than venturi meters, as we cannot use the exact location and diameter of the point of maximum convergence in calculations. Beyond the vena contracta point, the fluid expands again and velocity decreases as pressure increases.
What are the advantages and disadvantages of Venturi meter?
Advantages and disadvantages of Venturi meter
- High-pressure recovery.
- High coefficient of discharge.
- Smooth construction and low cone angle help to solid particles flow through it.
- It can be installed in any direction horizontal, vertical and inclined.
- More accurate than orifice and flow nozzle.
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.
Which is better Venturimeter and Orificemeter?
The Orifice meter is compulsorily to be installed on the pipes which is straight. The velocity vector of fluid must be perpendicular to the orifice plate for lower pressure loss and better accuracy in measurement of average velocity or flow rate or the flowing fluid.
Why is Venturi meter expensive?
Initial costs, installation and expensive maintenance. Requires a long placement length. That is, the venturi meter must be driven by a straight tube that has no connections or misalignments to avoid turbulence in the flow, for satisfactory operation. It can not be used in pipes of less than 7.5 cm in diameter.
How do you calculate steady flow?
where C∗ = C/g is a constant and ρwg = γw. The equation is now expressed in terms of energy per unit weight [units of L]. The respective terms in the equation are defined as follows: The term p/γw is the pressure or piezometric head.
Why is steady flow important?
In steady flow systems, flux, gradient, and water content are constant in time, while in transient flow systems, they vary. In general, therefore, measurements based on steady flow are more convenient to carry out and are often more accurate.
What causes the no slip condition?
What causes it? Sketch the no slip condition exits, when a fluid flows over the plate. That is a fluid in direct contact with solid, sticks to the surface, and there will be no slip occurs on the surface. This condition is called to be as no-slip condition.
What is advantage of laminar flow?
Laminar is a flow phenomenon where the fluid flows in layers without any disruption between and among the layers. The main advantage of assuming laminar flow across a conduit is that, it provides an easy job to analyze the fluid flow using CFD softwares.
What is considered a low Reynolds number?
Therefore, in the present work, a chord-based Reynolds number range between 104 and 105 is defined as the low-Reynolds- number range. Note that this range is two orders of magnitude lower than that of large-scale conventional aircraft, which typically operate at a Reynolds number of over 106.