OK.
It does not matter if the flow enters a larger diameter in the circuit. So going into a 16mm ID pipe only slows the velocity at that point, but as soon as it enters the next 12mm ID pipe the velocity increases again but the mass flow rate is the same.
Mass flow rate is always limited by the smallest cross sectional area anywhere in the circuit.
So if the cross sectional area of the combined area of the holes in the spray bars is the smallest area then that will reduce the flow rate.
Cheers,
It does not matter if the flow enters a larger diameter in the circuit. So going into a 16mm ID pipe only slows the velocity at that point, but as soon as it enters the next 12mm ID pipe the velocity increases again but the mass flow rate is the same.
Mass flow rate is always limited by the smallest cross sectional area anywhere in the circuit.
So if the cross sectional area of the combined area of the holes in the spray bars is the smallest area then that will reduce the flow rate.
Cheers,
