[Vwdiesel] PV=nRT and Hydraulics

[H.Hagar]

----- Original Message ----- 
From: H.Hagar 
To: vwdiesel at vwfans.com 
Sent: Wednesday, July 21, 2004 10:31 AM
Subject: PV=nRT and Hydraulics 


IMHO   fuel leaking by piston in pump releases heat ----- so I agree with Lee.

There is not energy enough stored in fluid due to the low compressibility so friction is
it.

Leakage in an air compressor would do as Val stated due to adiabatic cooling and the
energy stored in the compressed air.

Val had a real nifty way of explaining the dynamics of "thermo?" of gasses and fluids
that I really like ----wish I had come up with it.

Considering the numbers of us who like electricity --- the laws works much the same.

In a hydraulic system think of pressure as VOLTAGE   and flow as CURRENT -----
then a restriction to flow becomes a resistor.   So heat is produced .  
More pressure more heat , more flow more heat .    Clear as mud ?    in my mind it
is crystal clear.

A hydraulic loop is then behaving much like an electric loop.

Fixers of hydraulic farm and orchard equipment  run a cylinder to the end so pressure relief
valve opens . They do that to HEAT up oil fast on cold days.

It works that I know. All that horsepower ---- doing nothing but squeeze oil through the
poppet valve--------hot stuff.   Even at 3000 psi  say 3 gallons per minute is a lot of
heat.

Hagar.