Orifice Discharge into Free Air

An orifice is an opening with a closed perimeter through which water flows. Orifices may have any shape, although they are usually round, square, or rectangular.
Discharge through a sharp-edged orifice may be calculated from:

This article provides calculation methods for correlating design, flow rate and pressure loss as a fluid passes through a nozzle or orifice. Nozzles and orifices are often used to deliberately reduce pressure, restrict flow or to measure flow rate. (1) For the flow through rectangular microchannels with constant pressure gradient, the axial velocity increases faster in the center of the cross-section than in other areas as the slip length increases, while for the flows, due to the waveform pressure gradient, the velocity changes significantly as the slip length increases. Equation for a channel with rectangular cross section and then for a channel with arbitrary (but unvarying) cross section. To generalize Equation 4.1 to a rectangular channel, take the flow width to be b (Figure 4-3) and write the force balance for a free body that fills the channel, from wall to wall, in a segment of length L along the flow. Flow Rate Calculator. Easily calculate the volumetric flow rate of a pipe (a.k.a. Discharge rate) given its diameter (for a round pipe, height & width for a rectangular one) and the velocity of the liquid or gas flowing through it. The flow rate calculator can also calculate the mass flow rate of liquids given the liquid density is known.

Flow Through A Rectangular Slotted

Q = Ca?2gh

where
Q= discharge, ft³/s (m³/s)

C =coefficient of discharge

a =area of orifice, ft² (m²) Party poker ceo yahoo.

Viscous Flow Through Rectangular Slot

g =acceleration due to gravity, ft/s² (m/s²)

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h =head on horizontal center line of orifice, ft (m)

Air Flow Through Rectangular Slot

The coefficient of discharge C is the product of the coef- ficient of velocity C_v and the coefficient of contraction C_c. The coefficient of velocity is the ratio obtained by dividing the actual velocity at the vena contracta (contraction of the jet discharged) by the theoretical velocity. The theoretical velocity may be calculated by writing Bernoulli’s equation for points 1 and 2.Thus

V₂= ?2gh

The coefficient of contraction C_c is the ratio of the smallest area of the jet, the vena contracta, to the area of the orifice.

Submerged Orifices

Flow Through A Rectangular Sloth

Flow through a submerged orifice may be computed by applying Bernoulli’s equation to points 1 and 2 in figure below

Values of C for submerged orifices do not differ greatly from those for nonsubmerged orifices.