![]() The thermodynamic properties of air along the saturation curve are given in Table 1 these properties for the liquid and gaseous air-in Table 2. The equilibrium dissociation degree can be calculated according to the Saha equation. and Opaque Liquids ( and the Calculation of Dynamic Viscosity ) ASTM D 613-03b, Standard Test. This implies the transition of air into the plasma state. Prandtl number equation is defined as: Prandtl number equation where: is the kinematic viscosity, /. At 25 C, the viscosity is 18.6 Pas and the kinematic viscosity 15. The thermo physical properties of air at 60oC are:Density 1.06 kg/m3 Cp 1.008 kJ/kgK Thermal conductivity 0.028 W/mK and Dynamic viscosity 18.97 x. The Prandtl Number is a dimensionless number approaching the proportion of momentum diffusivity and thermal diffusivity. The kinematic viscosity of air at 15 C is 1.48 × 10 -5 m 2 /s or 14.8 cSt. Their equilibrium concentration can be derived from the isotherm equations of the respective reactions.Īt temperatures higher than 2000 K and moderate pressures the nitrogen and oxygen start to dissociate, and at temperatures exceeding 4000 K and atmospheric pressure the ionization of oxygen, nitrogen, and other components becomes evident. Blog Prandtl Number of Air The prandtl number of air is around 0.7 as many other gases at 1 atm. The nitrogen reacts with oxygen producing various oxides: N 2O, NO, NO 2, NO 3. The normal condensation temperature of air is -191.4☌, the normal boiling temperature -194☌.Īt elevated temperatures air undergoes some physicochemical transformations. ![]() Liquid air at atmospheric pressure behaves practically as an ideal solution following the Raoult's Law. ![]() Table B.1 gives the basic values for standard conditions. ![]() The normal (at 0.1013 MPa) boiling (condensation) temperature of the oxygen is equal- 183☌, that of the nitrogen -195.8☌. The properties of air are of interest in the context of damper cooling, and for its behaviour internally under pressure, and when forming an emulsion. Where v denotes specific volume u is specific internal energy R is the gas constant for air.Īt low temperatures the air is liquified. Dynamic viscosity can be defined as the tangential force per unit area required to slide a horizontal plane, which is at a unit distance from the neighboring. ![]()
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