Dynamic Viscosity

Heat Transfer Engineering and Design

Dynamic Viscosity

In fluid flow and heat transfer studies, the ratio of dynamic viscosity to density appears frequently.

Dynamic viscosity is a constant of proportionality µ , whose unit is kg / m · s (or equivalently, N · s/m2, or Pa · s, or poise = 0.1 Pa · s).

Dynamic Viscosity Air @ 1 atm vs Temperature

Dynamic Viscosity Air @ 1 atm vs Temperature

Dynamic Viscosity of Water @ 1 atm vs Temperature

Dynamic Viscosity of Water @ 1 atm vs Temperature

Dynamic viscosities of some fluids
at 1 atm and 20°C
(unless otherwise stated)
Fluid
Dynamic Viscosity
µ, kg / m · s
Glycerin:

-20°C
134.0
0°C
12.1
20°C
1.49
40°C
0.27
Engine Oil
SAE 10W
0.10
SAE 10W30
0.17
SAE 30
0.29
SAE 50
0.86
Mercury
0.0015
Ethyl alcohol
0.0012
Water:
0°C
0.0018
20°C
0.0010
100°C (liquid)
0.0003
100°C (vapor)
0.000013
Blood, 37°C
0.0004
Gasoline
0.00029
Ammonia
0.00022
Air
0.000018
Hydrogen, 0°C
0.000009
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