The Term Tab provides definitions of mathematical expressions that are used as intermediate terms in the expressions for the chemical reaction/equilibrium model.
The Expression Builder button in the Term tab can be used to build mathematical expression of all the terms. A mathematical expression is comprised of terms, species (species concentrations), parameters, constants, keywords, and mathematical functions and operators.
Field | Description |
Term | Term ID is the identifying name given to the term. |
Expression | The Expression is a mathematical expression involving species, parameters, constants, hydraulic variables or other terms. |
Description | Description of the meaning or usage of the expression term. |
The keywords include: D (Pipe diameter), Re (Renolds number), Kc (Pipe roughness coefficient), Q (Pipe flow or tank net outlet flow), U (Flow velocity), Us (Pipe shear velocity), Ff (DarcyWeisbach friction factor), Av (Surface Area/Unit volume), and Le (Tank water level) Mathematical functions and operators include:
Operator | Function Description |
+ | Add |
- | Subtract |
* | Multiply |
/ | Divide |
^ | Exponent |
( | Open parenthesis |
) | Close parenthesis |
EXP(X) | Returns the Exponential of a value in parenthesis. |
STEP(X) | STEP function is evaluated to 1 when x > 0 and is 0 otherwise. |
SIN(X) | Returns the Sine of the value in parenthesis. |
COS(X) | Returns the Cosine of the value in parenthesis. |
TAN(X) |
Returns the Tangent of the value in parenthesis. |
COT(X) | Returns the Cotangent of the value in parenthesis. |
SGN(X) | Returns the Sign of the value in parenthesis (1 if positive or zero and -1 if negative). |
ABS(X) | Returns the Absolute Value of the value in parenthesis. |
ASIN(X) | Returns the Arcsine of the value in parenthesis. |
ACOS(X) | Returns the Arccosine of the value in parenthesis. |
ATAN(X) | Returns the Arctangent of the value in parenthesis. |
ACOT(X) | Returns the Arc cotangent of the value in parenthesis. |
SINH(X) | Returns the Hyperbolic Sine of the value in parenthesis. |
COSH(X) | Returns the Hyperbolic Cosine of the value in parenthesis. |
TANH(X) | Returns the Hyperbolic Tangent of the value in parenthesis. |
COTH(X) | Returns the Hyperbolic Cotangent of the value in parenthesis. |
LOG10(X) | Returns the Base-10 Logarithm of the value in parenthesis Log 10. |
CURVE (Curve_ID, X_ID, interpolation method) | Where CURVE_ID is the ID of the curve, X_ID is the ID of the X value for the curve and interpolation method is either LINEAR or STEPWISE. |