Symbol

Units

Description

Modelica ID

$\mathrm{dp}$

$\mathrm{Pa}$

Pressure difference

p

$\mathrm{mflow}$

$\frac{\mathrm{kg}}{s}$

Mass flow rate

mflow

$v$

$\frac{m}{s}$

Velocity of flow

v

$\mathrm{D\_\_h\_act}$

$m$

Inner hydraulic diameter used for Fluid simulation

Dh_act

$\mathrm{A\_\_act}$

$m^2$

Flow area used for Fluid simulation

A_act

$\mathrm{Geo\_\_act}$

$-$

Geometrical coefficient used for Fluid simulation

Geo_act

$\mathrm{Re}$

$-$

Reynolds number for Friction factor calculation

Re

$\mathrm{Re\_\_target}$

$-$

Targeted Reynolds number for Friction factor calculation

Re_target

$\mathrm{\λ}$

$-$

Friction factor

lambda

$\mathrm{\λ\_\_lam}$

$-$

Friction factor for Laminar flow

lambda_lam

$\mathrm{\λ\_\_tur}$

$-$

Friction factor for Turbulent flow

lambda_tur

$\mathrm{\κ}$

$-$

Intermittency factor to calculate Transition zone

kappa

$\mathrm{\ρ\_\_a}$

$\frac{\mathrm{kg}}{m^3}$

Density at port_a

rho_a

$\mathrm{\ρ\_\_b}$

$\frac{\mathrm{kg}}{m^3}$

Density at port_b

rho_b

$\mathrm{\μ\_\_a}$

$\mathrm{Pa}\cdot s$

Dynamic viscosity at port_a

vis_a

$\mathrm{\μ\_\_b}$

$\mathrm{Pa}\cdot s$

Dynamic viscosity at port_b

vis_b

Name

Condition

Description

Modelica ID

$\mathrm{port\_\_a}$

Air Port

$\mathrm{port\_a}$

$\mathrm{port\_\_b}$

Air Port

$\mathrm{port\_b}$

$\mathrm{geo\_in}$

if External input of Geometrical coefficient = false

Geometrical coefficient input

$\mathrm{geo\_in}$

Symbol

Default

Units

Description

Modelica ID

$$\begin{gathered} \mathrm{Air} \\ \mathrm{simulation} \\ \mathrm{settings} \end{gathered}$$

$\mathrm{AirSettings1}$

$-$

Specify a component of Air simulation settings

Settings

$$\begin{gathered} \mathrm{Type} \mathrm{of} \\ \mathrm{pipe} \end{gathered}$$

$\mathrm{Circular}$

$-$

Select pipe type

 - General

 - Circular pipe

 - Rectangular pipe

TypeOfPipe

$L$

$0.1$

$m$

Pipe length

L

$\mathrm{D\_\_h}$

$0.1$

$m$

Internal hydraulic diameter if Type of pipe is General or Circular.

Dh

$\mathrm{a\_\_rect}$

$0.1$

$m$

Horizontal length only if Type of pipe = Rectangular.

a_rec

$\mathrm{b\_\_rect}$

$0.2$

$m$

Vertical length only if Type of pipe = Rectangular.

b_rec

$A$

$\frac{1}{4}\cdot \mathrm{Pi\_\_}\cdot {\mathrm{D\_\_h}}^2$

$m^2$

Flow area only if Type of pipe = General.

A

$\mathrm{roughness}$

$0.000025$

$m$

Absolute roughness of pipe, with a default for a smooth steel pipe

roughness

$$\begin{gathered} \mathrm{External} \\ \mathrm{input} \mathrm{of} \\ \mathrm{Geometrical} \\ \mathrm{coefficient} \end{gathered}$$

$\mathrm{false}$

$-$

If true, Geometrical coefficient is defined by the input. And, if Type of pipe = Rectangular, this parameter is valid.

Geo_ext

$\mathrm{Geo}$

$1$

$-$

Geometrical coefficient for Laminar flow only if Type of pipe = General and External input of Geometrical coefficient = false.

Geo

$\mathrm{data} \mathrm{source\_\_rect}$

inline

-

See Data Source Options section above.

DSM_geo_rec

$\mathrm{table\_\_rect}$

$\left[\begin{array}{cc}0& 1.5\\ 0.1& 1.323\\ 0.2& 1.192\\ 0.3& 1.094\\ 0.4& 1.023\\ 0.5& 0.9716\\ 0.6& 0.9360\\ 0.7& 0.9120\\ 0.8& 0.8983\\ 0.9& 0.8909\\ 1.0& 0.8887\end{array}\right]$

$-$

Geometrical coefficient for Rectangular pipe, if $\mathit{data}\mathbf{ }\mathrm{source\_\_rect}$ = inline.

[1] :Volume flow rate

[2] :Pressure difference

table_geo_rec

$\mathrm{data\_\_rect}$

$2$

-

Geometrical coefficient for Rectangular pipe, if $\mathit{data}\mathbf{ }\mathrm{source\_\_rect}$ =file or attachment. You can specify data by using an attached file or specifying the path of file (.csv and .xls, .xlsx)

data_geo_rec

$\mathrm{columns\_\_rect}$

$\left[2\right]$

-

Determines which columns of the data table will be used to interpolate.

For example, in an Excel spreadsheet, column A corresponds with 1, column B corresponds with 2, and so on.

columns_geo_rec

$\mathrm{skip} \mathrm{rows\_\_rect}$

0

-

Number of rows that are skipped from the top of the data table.

skiprows_geo_rec

$\mathrm{smoothness\_\_rect}$

Table points are linearly interpolated

-

Determines whether the data points will be interpolated linearly or with a cubic spline.

smoothness_geo_rec

$\mathrm{dp\_\_small}$

$0.1$

$\mathrm{Pa}$

Approximation of function for |dp| <= dp_small

dp_small

$\mathrm{sharpness}$

$1.0$

$-$

Sharpness of approximation for sqrt(dp) and sqrt(rho * dp)

sharpness

$\mathrm{T\_\_const}$

$0.001$

$s$

Time constant for Reynolds number calculation

T_const

$\mathrm{Re\_\_CoT}$

$3500$

$-$

Reynolds number of the center of Transition zone

Re_CoT

$$\begin{gathered} \mathrm{Spread} \mathrm{of} \\ \mathrm{Intermittency} \\ \mathrm{factor} \end{gathered}$$

$0.007$

$-$

Changing rate of Intermittency factor

IF_spread