Search results
Results from the WOW.Com Content Network
Orifice plate showing vena contracta. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. When a fluid (whether liquid or gaseous) passes through the orifice, its pressure builds up slightly upstream of the orifice [1] but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases.
Buoyancy flow calculation and force calculations are used in successfully predicting the effect of various natural calamities upon buildings, ships, aircraft and other commercial and non-commercial vehicles. They are also used in locating a prominent location for placing the exhaust chimney for the large scale industries. Also the shape of the ...
The fundamental difference between the orifice meter and the turbine meter is the flow equation derivation. The orifice meter flow calculation is based on fluid flow fundamentals (a 1st Law of Thermodynamics derivation utilizing the pipe diameter and vena contracta diameters for the continuity equation). Deviations from theoretical expectation ...
The draft (draught in British English) flow rate induced by the stack effect can be calculated with the equation presented below. [12] [13] The equation applies only to buildings where air is both inside and outside the buildings. For buildings with one or two floors, h is the height of the building and A is the flow area
The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate. Mathematically the flow coefficient C v (or flow-capacity rating of valve) can be expressed as
The higher the drawing ratio, the more extreme the amount of deep drawing. Due to the geometry, forces, metal flow and material properties of the work, there is a limit to the amount of deep drawing that can be performed on a sheet metal blank in a single operation. The drawing ratio is roughly calculated as, DR = Db/Dp.
Generally, the higher the flow rate required to produce a given pressure difference, the less airtight the building. [2] The fan pressurization technique is also described in many standard test methods, such as ASTM E779 - 10, [ 17 ] ASTM E1827 – 11, [ 18 ] CAN/CGSB-149.10-M86, [ 19 ] CAN/CGSB-149.15-96, [ 20 ] ISO 9972:2006 [ 13 ] (now ...
(4) is the empirical formula for Y, also found in ISO standards as ϵ (epsilon), for thin-edge orifice plates used for flow measurements with β in the range 0.2 to 0.75. The following formulae are for flow through orifices with smaller β and are not generally used for flow measurement.