Linear Orifice Flow Meter Drill size Determination
Intro
Research is being done to determine the optimal process for determining the diameter of the orifices on the LOFM. The drill size is currently was previously determined using the assumption of 5 holes in the first row of orifices and then applying that drill size to the rest of the LFOM. the new method will calculate the optimal drill size based on the flow rates through the upper holes, currently all of the upper rows are being evaluated to determine the critical row.
Initial 5 orifices in the first row assumption.
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Currently we are looking at integrating over a height of two centimeters starting at the top of the LFOM and working our way down. this will allow us to make sure that the height is appropriate at the most critical area, the top of the LFOM where normally only 1 hole is needed. By integrating over different heights and comparing the errors associated with each option we will be able to see which row of holes is the most critical (aka causes the least amount of error).
Model
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Optimization
I am currently working on evaluating the optimal way to determine diameter using a mathcad code. The current version of the code is available here
Model Optimization Code Documentation:
Step 1: Calculate the width of the rectangular portion of the weir
Step 2: Calculate the s value, the zero point of the sutro weir.
Step 3: Calculate the width of the entire weir, the curved portion and rectangular base.
Step 4: Create height arrays. The arrays will allow us to evaluate the flow rate occuring over one row.
Step 5: Calculate the area of each row and put that information into an array. Sample outputs for the height and area arrays are also show below.
Step 6: Determine the fewest number of holes by dividing the entire row area by the area of one hole with a diameter equal to the row spacing.