Method for determining the opening area of vacuum suction pipes
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There is currently a water ring pump with a flow rate of 27–30 m3/min, used for pumping sludge with a density of 1.5 t/m3. The inlet and outlet diameters of the water ring pump are DN150; the pipe outlet, with a diameter of DN80, extends for 100 meters before being connected to the suction tool via a hose. The suction tool is inserted into the bottom of a trench that is 2 meters deep to carry out the suction operation. So the question is: what is the maximum total area of the openings at the bottom of this suction tool, so that suction can be exerted through each opening?
With the design shown, won’t there be no suction on the sides due to too many openings in the middle? Please provide the calculation method.
Calculated at 30 m3/min, it is 1800 m3/h. To maintain a flow rate of 10 m/s, with a pipe diameter of DN80, a flow volume of 180 m3/h must be ensured. So, what size opening area at the suction end is required to ensure a flow rate of 180 m3/h?