Does the software calculate dynamic pressure changes of enlargements and contractions?
In enlarging or contracting pipes the following pressure changes are existing: 1. Pressure drop caused by friction, turbulences and flow separation: dP = resistance coefficient x density/2 x velocity² 2. Pressure change caused by changes of kinetic energy acc. Bernoulli formula: dP = density * (velocity1² – velocity2²)/2. For enlargements the pressure change is positiv, for contractions negativ. The element “Dyn. pressure change” calculates the static pressure changes caused by changes of kinetic energy. Normally you input the dimension of begin and end of the whole pipe. Attention: The calculated data are output as pressure drop, i.e. if the output is negativ the pressure is encreasing, if the output is positiv the pressure is decreasing. In previous program versions (< version 6.25) these pressure changes were calculated in combination with pipe enlargements and contractions. Correlation: Static pressure, dynamic pressure and total pressure and calculation example (Pressure changes c
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