TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








Kinematic viscosity vs temperature of fresh water: comparison of representation methods



Full text article ( in russian)

Year

 
2020

Issue

 
391

Volume

 
1

Pages

 
42-49

Caption

 
Kinematic viscosity vs temperature of fresh water: comparison of representation methods

Authors

 
Sokolov M.

Keywords

 
temperature, fresh water, kinematic viscosity coefficient, Reynolds number, friction resistance coefficient, equivalent plate, model tests, polynom

DOI

 
10.24937/2542-2324-2020-1-391-42-49

Summary

 
Object and purpose of research. This paper discusses various approaches to representation of kinematic viscosityvs-temperature curve of fresh water (tables and approximating functions) as taken from different publications. The purpose of this study is to identify the optimal representation for practical calculations during model tests.
Subject matter and methods.This paper compares the tables and approximating funcitons for kinematic viscosity-vstemperature curve of fresh water used by KSRC laboratories and those recommended by ITTC. The comparison is performed both directly and through the analysis of deviations in calculated Reynolds number and friction resistance coefficient of an equivalent plate obtained as per the same formula (Prandtl-Schlichting) but based on different representaitons of kinematic viscosity-vs-temperature curve.
Main results. The study shows the deviations due to the difference in curve representations and demonstrates that the error in friction coefficient of an equivalent plate calculated as per the most commonly used tables is negligible. The study also suggests approximating functions describing the curve recommended by the 26th ITTC.
Conclusion. The difference in representaitons of kinematic viscosity-vs-temperature curve of fresh water has practically no effect upon calculated friction coefficients, so the table recommended by the 26th ITTC should only be used for benchmark test purposes to facilitate the comparison of results with those obtained by foreign test facilities.

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