USA.įor Sutherland's formula and values for : Crane Company. Since Sutherland's formula is an empirical fit of measured data, the following table of reference data is needed.Ī gas with reference viscosity μ 0 = centiPoise,įor gas viscosity: Chemical Rubber Company (CRC). o reference viscosity in centipoise at reference. viscosity in centipoise at input temperature T. Gas viscosity is computed using Sutherlands formula (Crane, 1988): o (a/b) (T/To) 3/2. Gas viscosity can be modeled by Sutherland's formula: The input temperature is restricted to the range 0 < temperature < 1000 o F. Note that as an engineering quantity, the temperatures used are in the Rankine scale. It is primarily a function of temperature, and can be modeled in terms of temperature with the input of experimental reference measurements. viscosity gases liquids air-viscosity viscosity-temperature-charts liquid-petroleum-products viscosity. The effect of fuel air ratio (gas composition) is negligible for practical purposes. Question: Problem 3 (6 points) The viscosity of air as a function of temperature may be found using Sutherlands formula, ACT + 273.15)3/2T+B where T is the. As viscosity has only a second-order effect on an engine cycle, total temperature may be used up to a Mach number of 0.6. Gas viscosity is only weakly dependent on pressure near atmospheric pressure. Dynamic viscosity is a measure of the viscous forces and is a function of gas composition and static temperature. You can easily convert between the dynamic and kinematic viscosity of air as both quantities are related by the equation /. The viscosity of gases near room temperature are in the centiPoise range, so that is a commonly used unit. Consequently the dimensional formula of dynamic viscosity is. The viscosity of a gas can be thought of as a measure of its resistance to flow and is measured in the CGS unit Poise = dyne sec/cm 2. the increase occurs, thus giving the dimensional formula L/T/L. The deter- minations were used, primarily, to aid in the calculation of air viscosity from drag data obtained at the lowest temperatures where the pressure.
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