Isothermal Liquid Predefined Properties (IL)
Libraries:
Simscape /
Fluids /
Isothermal Liquid /
Utilities
Description
The Isothermal Liquid Predefined Properties (IL) block sets the working fluid liquid properties of your isothermal liquid network. The available predefined fluids are:
You can also model dissolved air in the system as a function of pressure. If you would like to specify your own working fluid properties, use the Foundation Library Isothermal Liquid Properties (IL) block. If you do not specify a fluid, the system defaults will apply. See Specify Fluid Properties for more details.
Fluid Properties Range
Water properties are provided between the triple point, when the fluid
temperature and pressure reach 273.160 K
and 611.657
Pa
, and the critical point, when the fluid temperature reaches
647.096 K
. Pmin
is set by the triple point or the saturation pressure, whichever is
greater.
The properties for ethylene-glycol, propylene-glycol, and glycerol are provided for temperatures above the solution freezing point. Note that the displayed minimum temperature when visualizing properties may be lower than the fluid freezing point; displayed temperatures are not updated for different mixture concentrations.
When specifying the mixture, you can define the concentration of ethylene glycol, propylene glycol, or glycerol to water by mass fraction or volume fraction in the Concentration type parameter.
Properties are available for concentration by mass between 0 and 0.6 and by volume between 0 and 1 for ethylene glycol; for concentration by mass between 0 and 0.6 and by volume between 0.1 and 0.6 for propylene glycol; and for concentration by mass between 0 and 0.6 for glycerol. Glycerol concentration by volume is not available.
The properties are stored as a function of temperature and concentration. All properties, except for density and the thermal expansion coefficient α are maintained as constants for a range of pressures.
Seawater properties are provided for temperatures between 273.15
K
and 393.15 K
and for pressures above the
system saturation pressure. The salinity concentration can range from
0
to 0.12
by mass.
The properties are stored as tabulated data with respect to pressure and temperature. The data is derived from MIT's Seawater software. For more information, see: https://web.mit.edu/seawater/
The properties provided are for a general, representative fuel mixture based
on Jet-A-4658 and Jet-A-3638 surrogates. The properties are provided at
temperatures between 222.22 K
and 645.61 K
and pressures above the saturation point.
The properties are stored as tabulated data with respect to pressure and temperature.
Diesel properties are provided for temperatures between 238.20
K
and 690.97 K
and for pressures above the
saturation point.
SAE 5W-30 properties are provided for temperatures between 235.15 K
and
473.15 K
and for pressures above 0.01
MPa
. The properties at the system temperature and atmospheric
pressure are based on measurements for temperatures between 29.85
°C
and 74.85 °C
(303 K
to
348 K
) and pressures between 7 MPa
and 87 MPa
. The block uses curve fits to define properties in
extrapolated regions.
Dissolved Air
You can optionally model air dissolved into the liquid system. Setting
Air dissolution model to On
models dissolution between Atmospheric pressure and the
Pressure at which all entrained air is dissolved by Henry's
law. For more information, see Fluid Models with Entrained Air.
Visualizing Fluid Properties
To visualize the fluid density and bulk modulus in your network, right-click on the Isothermal Liquid Predefined Properties (IL) block and select Fluids > Plot Fluid Properties:
Use the Reload Data button to regenerate the plot whenever the fluid selection or fluid parameters change.
Examples
Ports
Conserving
Parameters
References
[1] Massachusetts Institute of Technology (MIT), Thermophysical properties of seawater database. http://web.mit.edu/seawater.
[2] K.G. Nayar, M.H. Sharqawy, L.D. Banchik, J.H. Lienhard V. "Thermophysical properties of seawater: A review and new correlations that include pressure dependence." Desalination 390 (July 2016): 1-24.
[3] M.H. Sharqawy, J.H. Lienhard V, S.M. Zubair. "Thermophysical properties of seawater: A review of existing correlations and data." Desalination and Water Treatment 16, no. 1-3 (april 2010): 354-380.
[4] I.H. Bell, J. Wronski, S. Quoilin, V. Lemort. "Pure and Pseudo-pure Fluid Thermophysical Property Evaluation and the Open-Source Thermophysical Property Library CoolProp." Industrial & Engineering Chemistry Research 53, no. 6 (February 12, 2014): 2498–2508.