An accurate estimation method of kinematic viscosity for standard viscosity liquids

✍ Scribed by Y. Kurano; H. Kobayashi; K. Yoshida; H. Imai

• Book ID: 104788114
• Publisher: Springer
• Year: 1992
• Tongue: English
• Weight: 602 KB
• Volume: 13
• Category: Article
• ISSN: 0195-928X
• DOI: 10.1007/bf00501946

✦ Synopsis

Deming's method of least squares is introduced to make an accurate kinematic viscosity estimation for a series of 13 standard-viscosity liquids at any desired temperature. The empirical ASTM kinematic viscosity-temperature equation is represented in the form loglog(v + c)= a-b log T, where v (in mm 2. s 1) is the kinematic viscosity at temperature T (in K), a and b are the constants for a given liquid, and c has a variable value. In the present application, however, e is assumed to have a constant value for each standard-viscosity liquid, as do a and b in the ASTM equation. This assumption has since been verified experimentally for all standard-viscosity liquids. The kinematic viscosities for the 13 standard-viscosity liquids have been measured with a high accuracy in the temperature range of 20~0~ using a series of the NRLM capillary master viscometers with an automatic flow time detection system. The deviations between measured and estimated kinematic viscosities were less than __. 0.04 % for the 10 standard-viscosity liquids JS2.5 to JS2000 and _+0.11% for the 3 standard-viscosity liquids JS15H to JS200H, respectively. From the above investigation, it was revealed that the uncertainty in the present estimation method is less than one-third that in the usual ASTM method.