Originally Posted by steadly2004
Originally Posted by billbartuska
No. Any restriction the water "sees" is caused by what it is flowing through, not what is upstream, downstream, or parallel to that restriction. But the total
restriction the water "sees" is the sum of all the restrictions it "sees" in the loop.
It's a different way of looking at it but that's the way your god made hydrodynamics work.
You are correct sir... I mis-spoke. I means if the downstream is more restrictive than the blocks..... The what's left will be unevenly distributed with less flow than without it. My bad. But I see what you're saying.
Sounds like you might me able to help me understand if I'm just wrong.
If the radiator flows 4 "units", and one block flows 2 and another flows 3. Will the 2 not get a different flow than the 3?...Not speaking about the total flow? I understand the total flow will be restricted to the 4
. Do liquids not flow to the path of least restriction? Wouldn't the block that flow 2 get less cool water than the clock that flows 3?
Basically if a flow is restricted to 4 "lanes" after the blocks and those 4 lanes are distributed over 5 prempting lanes. Then the 2 lanes will get 2/5 of the 4 lanes and the. 3 lanes will get 3/5 of the 4 lanes.
Let's try this:
The race track effect
No matter what the flow rate is the water spends exactly the same amount on time in any component in a loop.
Consider a race track that is a one mile oval and has two lines painted on it 88 feet apart.
A car going 60 mph around the track spends one second between the lines each lap.
A car going 120 mph around the track spends one half second between the lines each lap.
But in two laps both cars spend the exact same amount of time between the lines because the second car gets there twice as often.
Why does higher flow rates in a loop yield better cooling? There are two reasons:
1.) At the higher flow rate the temperature differences of the water between entering and leaving the block (or rad) are closer, so there's a greater Delta T between the block (or rad) and the water. This results in more heat transfer than if the water was moving slower.
2.) At higher flow rates there is more turbulence than at lower flow rates resulting in better heat transfer. (We could get into laminar flow vs non laminar flow, but that's not necessary here)
How does this effect serial vs parallel?
While there may be an overall flow rate increase with a parallel loop, at least one block (or rad) will have a lower flow rate, most likely they both will.
Perhaps these pictures will explain:
edit: Turbbulence is spelled wrong in the pic, but I'm to lazy to fix that.
Edited by billbartuska - 1/25/17 at 7:05am