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Total head loss through the orifice plates were calculated given user input for width and number of orifice plates. These calculations utilize the fluids functions found at the top of this page. Essentially, the head loss through one orifice plate was determined. The total head loss through the plates was then found by multiplying the number of plates by the head loss through one plate only. It should be noted that the head loss through these plates are purely cause by shear forces and thus experience major losses only.
Head Loss Through Orifice Plates -
Head loss through the external tubing was then calculated given user input for the the desired length of the tubing. The calculations were similar to those above. The total head loss through the system then can be defined as the summation of the head loss through the orifices plates and the head loss through the wider, encompassing tubing. Head Loss Through Tubing -
Using this information, the necessary flow of alum from the doser based on dimensions given above is determined. Using a required dose concentration of 1.5 mg/L in the untreated water, the necessary stock concentration located in the alum doser can be calculated.
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