When a fluid flows across an orifice what happens to the fluid?
Introduction. In the case of a simple concentric restriction orifice the fluid is accelerated as it passes through the orifice, reaching the maximum velocity a short distance downstream of the orifice itself (the Vena Contracta).
What is flow through an orifice?
An orifice is a small aperture through which the fluid passes. The thickness of an orifice in the direction of flow is very small in comparison to its other dimensions. If a tank containing a liquid has a hole made on the side or base through which liquid flows, then such a hole may be termed as an orifice.
What happens when the flow through an orifice is increased?
When a fluid (whether liquid or gaseous) passes through the orifice, its pressure builds up slightly upstream of the orifice but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases.
How do you determine the diameter of an orifice plate?
Orifice plate types It is made up of SS and its thickness varies from 3.175 to 12.70 mm. The plate thickness at the orifice edge should not be exceeded by any of the following parameters: 1 – D/50 where, D = The pipe inside diameter. 2 – d/8 where, d = orifice bore diameter.
What is the working principle of orifice meter?
Basic Working Principle of an Orifice Meter The liquid or gas whose flow rate is to be determined is passed through the orifice plate. This creates a pressure drop across the orifice plate which varies with the flow rate, resulting in a differential pressure between the outlet and inlet segments.
What is orifice and its types?
It is frequently used more than any other flow meter. The orifice consists of a thin metal plate with a straight hole drilled in it. When a fluid passes through an orifice, the flow is often less than the amount calculated.
What is the effect of rounding the edge of an orifice?
Rounding of an upstream face corner can partially or fully suppress contraction. For example, 1-percent rounding of the upstream face corner of the opening perimeter in terms of minimum orifice opening dimension causes about a 3-percent increase of the contraction coefficient.
How do I know my orifice size?
Divide the flow of the liquid by the velocity of the liquid to determine the area of the orifice in square feet. In the above example, you would divide 8 by 2. The total area of the orifice would be 4 square feet.
When using orifice plate do you measure flow?
Orifice plates are a primary flow element, detecting the flow of a fluid passing through the plate by sensing the pressure drop across the plate. When a fluid flows through a restriction in a pipe, it creates a pressure difference between upstream and downstream of the restriction.