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Consequently, if a liquid has dynamic viscosity of n centiPoise, and its density is not too different from that of water, then its kinematic viscosity is around n centiStokes. For gas, the dynamic viscosity is usually in the range of 10 to 20 microPascal-seconds, or 0.01 to 0.02 centiPoise. The density is usually on the order of 0.5 to 5 kg/m^3.
Under standard atmospheric conditions (25 °C and pressure of 1 bar), the dynamic viscosity of air is 18.5 μPa·s, roughly 50 times smaller than the viscosity of water at the same temperature. Except at very high pressure, the viscosity of air depends mostly on the temperature.
Here dynamic viscosity is denoted ... Dry air: 3.617 97.0 Helium: 2.576 10.2 Hydrogen: 2.915 ... Comprehensive tables of these parameters for hundreds of liquids can ...
The poise is often used with the metric prefix centi-because the viscosity of water at 20 °C (standard conditions for temperature and pressure) is almost exactly 1 centipoise. [3] A centipoise is one hundredth of a poise, or one millipascal-second (mPa⋅s) in SI units (1 cP = 10 −3 Pa⋅s = 1 mPa⋅s). [4] The CGS symbol for the centipoise ...
1.225 kg m −3: Kinematic viscosity 1.4607 × 10 −5 m 2 s −1: Dynamic viscosity 1.7894 × 10 −5 kg m −1 s −1: Molar volume 2.3645 × 10 −2 m 3 mol −1: Molecular weight 28.966 Thermal conductivity 2.5339 × 10 −2 W m −1 K −1: Mean free path 6.6317 × 10 −8 m Collision frequency 6.9204 × 10 9 s −1: Particle speed 4.5894 ...
The dilute gas viscosity contribution to the total viscosity of a fluid will only be important when predicting the viscosity of vapors at low pressures or the viscosity of dense fluids at high temperatures. The viscosity model for dilute gas, that is shown above, is widely used throughout the industry and applied science communities.
The capillary number is defined as: [2] [3] C a = μ V σ {\displaystyle \mathrm {Ca} ={\frac {\mu V}{\sigma }}} where μ {\displaystyle \mu } is the dynamic viscosity of the liquid, V {\displaystyle V} is a characteristic velocity and σ {\displaystyle \sigma } is the surface tension or interfacial tension between the two fluid phases.
In acoustics, Stokes's law of sound attenuation is a formula for the attenuation of sound in a Newtonian fluid, such as water or air, due to the fluid's viscosity.It states that the amplitude of a plane wave decreases exponentially with distance traveled, at a rate α given by = where η is the dynamic viscosity coefficient of the fluid, ω is the sound's angular frequency, ρ is the fluid ...