I have designed an airflow resistance element and I would like to be able to keep the total pressure drop across the element to < 5.0 inches of water (from 5cc/min to 5,000 cc/min). I have run some bench tests on the current design and the pressure drops are a bit too high. I would like to avoid changing the diameter of the bore and would prefer to shorten the length of the flow path. What would be the best way to calculate the ideal flow path length to achieve the pressure drops I am looking for?
Your resistor presents 3 resistances to the flow : entry-pipe-outlet.
Only if the ratio length to diameter is quite bis the pipe resistance is important with respect to the other 2. The answer to your question depends on the relative value of the pipe resistance in comparison with the 2 other.
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