Originally Posted by cyrixMII300
as for greater flow from splitting the flow there exists no such thing. the flow of the pump is determined by the design of the pump and not the flow patterns. no matter how u direct the tubes, the flow will remain constant for any particular power consumption. what changes is the pressure drop.
I must respectfully disagree!
For any pump at a given voltage, flow goes down as head pressure (usually measured in feet of water) goes up. And head pressure goes up with increased resistance to flow.
Here's an example graph, from Dangerden:
And, for a given system, head pressure increases as flow resistance increases--from things like increased total tubing length, reduced tubing diameter, and constrictions in the system like waterblocks and tubing connectors.
Short form: more waterblocks in series ==> greater total tubing and constriction ==> greater flow resistance ==> less flow.
Perhaps a thought experiment will make it clearer: take a system (with a reservoir) that is functioning at a given flow rate, and kink a hose so that it is blocked (infinite resistance to flow). By your logic, total pressure drop would remain the same, along with flow. But we know that's not the case, and flow would stop.
Putting in additional waterblocks is like putting a constriction in a hose--not total blockage, but resistance goes up, and flow goes down.