Mildly Interesting: loop flowrate changes based on fluid temperature

[AnonymousGuy]

Sorry for the chart overlays but the lines to care about are the teal color = flowrate on a range of about 185 L/h to 210L/h .  The other lines are various components on a scale of around 29C up to 40C.  The temperature spike around 11PM and corresponding flowrate increase is from when I turned off the whole-house loop pump to do some upgrades (smash that like button to see more of that! no? ok then...).  The desktop loop is heat-exchanged with the whole house loop so it keeps running.  Mildly interesting that hotter fluid = more flowrate.

 

 

The trends in the lines are from my house temperature variations throughout the day/night.  I didn't do any gaming in this chart or you'd see noticeably when that was.

[jaslion]

Technically makes sense as hotter means the molecules are more active. But what I think is going on here is thermal expansion of the loop allowing for easier water transfer.

[For Science!]

8 hours ago, AnonymousGuy said:

Sorry for the chart overlays but the lines to care about are the teal color = flowrate on a range of about 185 L/h to 210L/h .  The other lines are various components on a scale of around 29C up to 40C.  The temperature spike around 11PM and corresponding flowrate increase is from when I turned off the whole-house loop pump to do some upgrades (smash that like button to see more of that! no? ok then...).  The desktop loop is heat-exchanged with the whole house loop so it keeps running.  Mildly interesting that hotter fluid = more flowrate.

 

 

The trends in the lines are from my house temperature variations throughout the day/night.  I didn't do any gaming in this chart or you'd see noticeably when that was.

Going to assume this is due to decreasing viscosity with increased temperature. Is this just water, or perhaps some glycol based coolant?

[AnonymousGuy]

11 hours ago, For Science! said:

Going to assume this is due to decreasing viscosity with increased temperature. Is this just water, or perhaps some glycol based coolant?

Mayhem X1 with the normal 10% concentration.  I too would guess it's just the viscosity changing...probably would see similar behavior with plain water?

[airborne spoon]

it would make complete sense hotter fluid would flow faster. i mean if you take cold oil it is pretty stiff compared to hot fresh out of an engine oil is gonna flow all over the place and splash about easily. I would expect water to behave in a similar manner of flowing faster/easier when its hot compared to cold.