Return to index: [Subject] [Thread] [Date] [Author]

Re: Measurement of Viscosity

[Subject Prev][Subject Next][Thread Prev][Thread Next]
>Is 0.0 centipoise the consistancy of fresh water?
No. No real fluid has zero viscosity, which implies that an object would
move in the fluid without drag.

Just for cultural value, the viscosity relates the shearing stress in a
moving fluid to the velocity gradient: shear equals viscosity times
velocity gradient. As a result the viscosity has units of
stress/(velocity/length) or (force)(time)/length^2). For so-called
Newtonian fluids, which doesn't include resins, the viscosity is constant.

One other thing--lot of weird units associated with viscosity from the
SAE numbers to SSU, which derives from a particular testing device. I've
never seen 'cps' used for viscosity units. Centipoise is sometimes
abreviated cp. Water has a room temperature viscosity of 2 centipoise.
200 centipoise is somewhere between crude oil and glycerin.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers
*   Association of Southern California (SEAOSC) server. To
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you
*   send to the list is public domain and may be re-posted
*   without your permission. Make sure you visit our web
*   site at:
******* ****** ****** ****** ******* ****** ****** ********