Simple Formula To Estimate Water Viscosity

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There are many ways to obtain the Dynamic viscosity of water. You may use Steam table, Excel calculator using Water97_v13 add-in, Steam Calculator (web), SteamTab program, simulator like HYSYS, etc. All above required you to have the material on hand.

Following is a simple equation to estimate the Dynamic Viscosity of Water. It is easy to be written in your notebook or memorize.

*Applicable in water temperature of 25-250 degC

Earlier post "Conduct Steam-Water Balance MANUALLY using Water97_v13" has discussed the Dynamic Viscosity can be extracted using a special function, viscW(T,P) in Excel Add-on in (Water97_v13.xla or Alternative download). The dynamic viscosity of water at different temperature from 30 to 250 degC (at 40 barg) have been predicted using Water97_v13.xla and Dynamic Water Viscosity formula . Results tabulated as follow :

The error is 01-3.5% with maximum 5.75% at low temperature. It is consider rather sufficient from engineering perspective and pretty useful when you have nothing on hand.

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