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Introduction and Help for Viscosity Calculation

Introduction

It is a frequently encountered task for a tribologist to calculate viscosity at a specific temperature or viscosity index. It will be nice to have a computer program to do the work, especially when VI is involved. This program can be used to estimate viscosity or viscosity index for liquid petroleum products.

The ASTM D341-93 is used for viscosity-temperature relation calculations. The VI calculations follow the method described in the Appendix X2 of ASTM D2270-93 and use Table X2.2.

Help for Using the Program

This program contains four modules to facilitate viscosity and viscoaity index related calculations.

1. Temperature Conversion

This module is provided for the convience of the user to convert between different temperature units.

  1. Type in the temperature of the known unit.
  2. Press the ENTER key on the keyboard.
  3. The temperatures for the other units will be shown.

2. Relationship Among Viscosity at 40 °C, Viscosity at 100 °C, and VI

This module can be used to calculate kinematic viscosity at 40 °C, viscosity at 100 °C, or Viscosity Index (VI) providing that two of them are known. User can either specifies two viscosities and gets VI or specifies VI and viscosity at one temperature and gets the viscosity at another temperature.

  1. Type in two known quantities.
  2. Press a BUTTON in the module to get the third quantity.

Note: The viscosity index is not defined and may not be reported for oils of kinematic viscosity of less than 2.0 cSt at 100 °C.

3. Viscosity - Temperature Relations

This module calculate viscosity at a specified temperature with user supplied viscosities at two other temperatures.

  1. Type in the viscosities and the corresponding temperatures.
  2. Specify the temperature of interest.
  3. Press the ENTER key on the keyboard.

4. Calculate Viscosity from VI and Another Viscosity

This module calculate viscosity at a specified temperature with user supplied VI and viscosity at another temperature.

  1. Type in the viscosity and the corresponding temperature.
  2. Specify the temperature of interest.
  3. Press the ENTER key on the keyboard.
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