Material Flow Section - pH, Charge and Transport Properties
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| Material Flow (Qo) | Qxxxx Tab Include Properties | Species Flow | Optional Tabs | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic Information | Energy ValuesAtUserTandP | Density Correction Solubility Saturation | Acidity Charge Transport | HeatsOfCombustion Heating Values | Solution Impurity H2O Properties | Water Quality | Sp Tab EC Tab | DLockup LockUp | DTrack Track | DSz Sz MSz | DSSA SSA |
Related Links: Common Content Section
This section is used to display the included properties for: Acidity, Charge and Transport.
Acidity (pH)
This section is used to display the included properties for: Acidity
Data Section
| Tag (Long/Short) | Input / Calc | Description/Calculated Variables / Options |
|
Acidity (pH) These values are calculated based on the Ka and Kb values for acids and bases that are defined in the species database. It does not take buffering into account, and hence is, at best, an estimate of the pH. SysCAD does have default Ka and Kb values defined for some acids and bases, and the user may enter values for other compounds. For a description of the method that SysCAD uses to calculate the acidity values see Acidity Calculations. These values will only be shown if the user has chosen to display the pH_Estimate variables on the Plant Model - Views tab page or from the Include Properties dropdown list on the first page of the material Flow section. | ||
| Acidity(@25C) | ||
| pH.State | Calc | Either OK - only acids or bases present, OR Acid and Base present, therefore the calculations will be inaccurate. |
| pH.negLogH | Calc | This is the negative of the log of the Hydrogen ion molar concentration at 25°C. |
| pH.AcidsPresent | List | This lists all of the acids present in the stream that are used to calculate [H+] (molar concentration). |
| pH.BasesPresent | List | This lists all of the bases present in the stream that are used to calculate [OH-] (molar concentration). |
| pH.H_Cation | Calc | Only displayed if the species list includes H+(aq). This is the negative of the log of the Hydrogen ion molar concentration at 25 °C, due only to the presence of the H+(aq) ion (all other acids and bases are ignored). |
Charge
This section is used to display the included properties for: Charge.
Data Section
| Tag (Long/Short) | Input / Calc | Description/Calculated Variables / Options |
|
Charge These values are calculated based on the species charges that are defined in the species database. These values will only be shown if the user has chosen to display the Charge variables on the Plant Model - Views tab page or from the Include Properties dropdown list on the first page of the material Flow section. | ||
| Charge.State | Calc | Either Neutral (charge is balanced), Positive (positively charged) or Negative (negatively charged). |
| Charge.Overall | Calc | The overall charge of the material in the stream. |
| Charge.CationsPresent | List | This lists all of the positively charged species present in the stream that contribute to the overall charge. |
| Charge.AnionsPresent | List | This lists all of the negatively charged species present in the stream that contribute to the overall charge. |
Transport Properties
This section is used to display the included properties for: Transport Properties.
Data Section
| Tag (Long/Short) | Input / Calc | Description/Calculated Variables / Options |
|
Transport Properties These properties are related to the transport properties of the stream, e.g. viscosity, etc. These will only be shown if the user has chosen to display the Transport Properties on the Plant Model - Views tab page or from the Include Properties dropdown list on the first page of the material Flow section. | ||
| VViscosity | Calc | (Dynamic) Viscosity of the vapour phase |
| LViscosity | Calc | (Dynamic) Viscosity of the liquid phase |
| VKinematicVisc | Calc | Kinematic Viscosity of the vapour phase = Dynamic Viscosity of vapour phase (VViscosity) / Density of vapour phase (VRho) |
| LKinematicVisc | Calc | Kinematic Viscosity of the liquid phase = Dynamic Viscosity of liquid phase (LViscosity) / Density of liquid phase (LRho) |
| VThermalCond | Calc | Thermal Conductivity of the vapour phase |
| LThermalCond | Calc | Thermal Conductivity of the liquid phase |
| VPrandtlNo | Calc | Prandtl’s number for the vapour phase = heat capacity (VmsCp@T) * dynamic viscosity (VViscosity) / thermal conductivity (VThermalCond) |
| LPrandtlNo | Calc | Prandtl’s number for the liquid phase = heat capacity (LmsCp@T) * dynamic viscosity (LViscosity) / thermal conductivity (LThermalCond) |
| LSurfaceTens | Calc | Surface Tension of the liquid phase. |
| IF97 | ||
| WaterViscosity | Calc | The viscosity of pure water at the stream temperature and pressure as calculated by IF97. |
| SteamViscosity | Calc | The viscosity of pure steam at the stream temperature and pressure as calculated by IF97. |