I am collecting VOCs from soil in hermetic jars;
I have air pumps that draw around 2 L/min of air. This is too much; rule of thumb to avoid oversampling or under sampling is around .45 L/min. To maximize my sampling I was hoping to connect 4 jars at a time to one air pump using a manifold (in a closed circuit), which would avoid the need to purchase more pumps and flow meters.
Instead of trying to adjust each spigot on the manifold (which is very difficult since adjust one changes the flow in all the others, like tuning a piano), I was hoping to simply adjust the main air intake on the pump to 1.8 L/min. I'm treating the airflow as if it were a parallel electrical circuit which would mean that the initial flow would be divided in 4 equal parts.
I don not know if I'm correct in assuming this, are there other better ways in getting the flow to .45 L/min per gang valve port (4 ports fully opened)?
Christien,
There are many methods to achieve equal flow to each branch (0.45) of the dividing manifold , with equal spacing between branches. The simplest way is by making the main pipe is too large in diameter to decrease the velocity and hence the pressure loss in the main pipe to be so small compared with each branch. This way to avoid , in the other methods, any further complication by changement in the main pipe diameter along its length or any branch size or lenght to maintain equal flow.
Regards
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