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Well, no; but. The specific heat is the same and the flow rate
around the loop is (roughly) the same. The lower viscosity will result in
more flow through the bearings and rotors (less bypassing through the pressure
control valve) providing more effective cooling of the rotors.
Well that's actually a bonus that I wasn't
considering.
But it has little effect on the heat rejection (other
than slightly better heat transfer coefficient), so, one might expect the oil to
heat up at the same rate, or a bit faster.
I've always read that it
was difficult to cool oil because it tends to cling to the surface.
Specifically, when the subject of cooling oil in the pan comes up, someone
always points out that oil clings to the cooler pan surface, and gets a little
thicker, allowing other hot oil to just flow over the top of that film of
thicker oil. In other words, the oil flows past without making any real
contact with the relatively cool pan surface. I always figured this
same thing happened to some extent in the tubes of oil coolers as well. So
go ahead, shatter my mental reality and tell me this is all BS :-)
Unless there is something major I’m missing.
In a couple weeks, we'll
see if there's any real difference in temps. If not, you aren't missing
anything major :-)
Thanks,
Rusty (@$*^& Earl's
fittings)
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