NA-05 - Cleaning: Solids in Drain and Sewer Systems (Demo)

Transport behaviour of solids

Transport behaviour of solids (4)

According to the study by Macke deposit free states can be reached by a steady flow, when the following conditions at the critical velocity vc are met:

Equation 5: (wastewater)

 

Equation 6: (combined and rain water)


 

[Macke82]

 

 

The corresponding wall shear stress is determined using the equation:

Equation 7:

with
ρ = density of the wastewater [kg/m3]
g = gravitational acceleration [m/s2]
rhy = hydraulic radius (A/lU) [m]
IR = friction factor [-]

 

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