**Fluid Workbench** (FWB) is a software for calculations of thermodynamic, thermophysical and radiation properties of gases and plasma. The primary users are researchers and engineers,involved into CFD modeling for chemical engineering, combustion, plasma and microelectronics areas.

#### Fluid Workbench highlights

### Gas properties calculated by FWB

FWB permits to calculate following properties of gases:

- Equilibrium composition, ni
- Constant pressure heat capacity Cp(T,P)
- Enthalpy H(T,P)
- Entropy, S(T,P)
- Viscosity coefficient μ(T,P)
- Binary diffusion coefficients D
_{ij}(T,P) for all pairs of particles (i,j) - Thermal conductivity coefficient λ(T,P)
- Electrical conductivity σ(T,P)
- Absorption coefficient k
_{abs}(T,P) - Net Emission Coefficient ε
_{net}(T,P) - Radiative heat conductivity λ
_{rad} - Refraction index
- Radiation spectrum

### Kintech Database

Kintech DB provides the information for calculation of thermodynamic properties, radiation and gas transport properties.

DB contains nessecary information for calculation of radiation characteristic: electronic levels structure and transitions probabilities for atoms and molecules. There are data for 30 atoms and 20 molecules. Calculation can be done for wide range of temperatures 300-40000 K and pressure 0.01 - 100 atm.

DB for transport properties calculation contains all necessary information for calculation transport properties: diffusion coefficient, viscosity, thermal conductivity, electrical conductivity. Calculation of transport properties can be performed in temperature range 300-30000 K and pressure 0.1- 300 atm.

DB of thermodynamic properties contains data (entropy, enthalpy, Gibss potential, heat capacity) for 4150 species in gas, liquid and condensed states in temperature range 300-20000K (or more for multicharged ions).

### Set of models

There are four principal models used for calculation of properties:

- Thermodynamic Equilibrium Reactor (TER) model. This model is used for calculation of chemical composition and thermodynamic function of media.
- Frozen composition model is used for calculation of thermodynamic properties of non-equilibrium systems.
- Transport module calculates following properties: viscosity, diffusion coefficients, thermal conductivity, electrical conductivity, heat capacity.
- Optical module calculates absorption coefficient and refraction index.

### Postprocessing

Modules of postprocessing permits to analyse and use obtained properties of gases, plasma for:

- modeling of radiation spectrum;
- calculate of radiation flux (Net Emission Coefficient) of gases, plasma;
- calculated input of trapped radiation in thermal conduction flux (Rosseland heat conduction coefficient).

### Descrition of models and approaches (download)

Description of used approaches for calculation of chemical composition, thermodynamic, thermophysical and optical properties of gases and plasma can be found in **Video and Tutorials** section,
or by direct link to the document.