Posted By: Gokhan

## Calculator for viscosity mixing based on the Lederer - Roegiers equation - 06/23/19 10:34 AM

I just realized that the Widman viscosity-mixing calculator and similar calculators on the Internet are totally useless. They are very inaccurate.

After some brief reading, it looks like the Lederer - Roegiers equation works well. The only caveat is that there is an adjustable parameter alpha that accounts for the intermolecular cohesion energy, which ideally needs to be determined empirically.

Here is the article I read:

Viscosity-blending equations

Boris Zhmud, Ph.D., Assoc.Prof., MRSC

Sveacon Consulting, Stockholm, Sweden

Lube-Tech, No: 93, Page 1

http://www.lube-media.com/wp-content/uploads/2017/11/Lube-Tech093-ViscosityBlendingEquations.pdf

I created a spreadsheet that you can plug in your values to calculate the blend viscosity:

Here is the link for the calculator. Enjoy!

Gokhan's viscosity-mixing calculator based on the Lederer - Roegiers equation

After some brief reading, it looks like the Lederer - Roegiers equation works well. The only caveat is that there is an adjustable parameter alpha that accounts for the intermolecular cohesion energy, which ideally needs to be determined empirically.

Here is the article I read:

Viscosity-blending equations

Boris Zhmud, Ph.D., Assoc.Prof., MRSC

Sveacon Consulting, Stockholm, Sweden

Lube-Tech, No: 93, Page 1

http:/

I created a spreadsheet that you can plug in your values to calculate the blend viscosity:

Here is the link for the calculator. Enjoy!

Gokhan's viscosity-mixing calculator based on the Lederer - Roegiers equation