Skip to main content

Read our primer articles on Grease Guns and Oil Sight Glasses.

I found the next graphics and data:

1.- http://2.bp.blogspot.com/-1fiP...dad%2Bcinematica.png.

2.- http://www.engineeringtoolbox....roperties-d_156.html

How can I explain that the kinematic viscosity of air is greater than water. The result is 15 cSt at 50 C° aproximately. it is make a sense?

I know that the kinematic viscosity is the absolute viscosity divided for density.

But in tribology, how is this effect?

for example a particle in motion in both fluids. water and air.

regards.
Original Post

Replies sorted oldest to newest

Your quoted kinematic viscosity number is in fact million times smaller as is indicated in the column of the table you used. According to the data in the table you are referring to, I see that the kinematic viscosity of air at atmospheric pressure is 16.97 x 10-6 cSt at 40 deg C, and 18.90 x 10-6 cSt at 60 deg C. At 50 deg. C, kinematic viscosity would be somewhere in between 40 and 60 deg C. I hope this helps put to rest your dilemma.
Dear AngeLube, I stand corrected. Your calcs are correct. I overlooked the fact that the table shows data in m2/s units..Frown

I am not sure there could, other than for a pure theoretical/scientific purposes, be possible to make any relation to practical tribology. However, I think that the molecular sizes, density, surface tention and wetting characteristics of each media would affect particle motion through them.
Post
×
×
×
×
Link copied to your clipboard.
×