Gas properties (P)#

The Gas properties (P) block defines the gas properties for an pneumatic network.

To set the ideal gas properties, you must add this block to the pneumatic network. If this block is not added, air is used by default.

Properties of an ideal gas

Gas density (1):

(1)#\[\rho = \frac{p}{R\cdot T}\]

where:

p - gas pressure, [Pa];

R - specific gas constant;

T - gas temperature, [℃].

Dynamic viscosity (2):

(2)#\[\mu = \mu_0 \cdot (\frac{T_0+C}{T+C})\cdot (\frac{T}{T_0})^{\frac {3}{2}}\]

\(\mu_0\) - dynamic viscosity at nominal temperature;

T\(_0\) - nominal temperature, [℃];

C - Sutherland constant.

Kinematic viscosity (3):

(3)#\[\nu =\frac{\mu}{\rho}\]

Isobaric heat capacity (4):

(4)#\[c_p =\frac{c_v+R}{M}\]

where:

c\(_v\) - molar heat capacity at constant volume;

M - molar mass.

thermal conductivity (5):

(5)#\[\lambda =\lambda_0 \cdot (\frac{T}{T_0})^n\]

where:

\(\lambda_0\) - thermal conductivity at nominal temperature;

n - Temperature dependence exponent of thermal conductivity.

1. Properties#

Property	Default value	Description	Units of measurement
Related block	-	You must select a block that has already been added to the canvas	-
Parameter	-	Once the `Related block` is selected, its inputs and outputs will become available for selection	-
Molar mass	0.02897	-	kg/mol
Nominal temperature (for determining viscosity and thermal conductivity)	273.15	-	K
Dynamic viscosity at nominal temperature	0.00001716	-	Pa·s
Sutherland constant	110.4	-	K
Temperature dependence exponent of thermal conductivity	1	-	dimensionless
Thermal conductivity at nominal temperature	0.0241	-	W/(m·K)
Molar heat capacity at constant volume	20.8	-	J/(mol·K)

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