... a gas at low velocity, the equation of continuity is; AV = Q = CONSTANT Where; A - Cross-Sectional Area V - Mean Velocity Q - Volumetric Flow Rate Bernoulli's theorem shows the principle of conservation of energy for a steady flow. For an inviscid or frictionless flow, the following equation is applied; Where; P - Static Pressure p - Density Z - Elevation above an arbitrary value V- Fluid velocity Bernoulli's equation shows that the sum of the three quantities is a constant. In this experiment, the duct is horizontal; therefore, there is no gravitational effect. In this case we could ignore the gz term. It is then convenient to express the static pressure, P as an equivalent head of liquid h (=p/?g), and hence the Bernoulli's equation becomes: h + v2 = CONSTANT 2g Apparatus The set-up consists of a pipe of constant diameter, then a short contraction to a narrow throat followed by a long diffuser and finally a pipe of the same ...

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