Description
Return viscousDrop = viscousCoefficient*velocity*depth, inertialDrop = inertialCoefficient*velocity*abs(velocity)*depth and totalDrop as their sum.
Nominal hydraulic ratios connect flow to area, length, volume or travel time. These local terms depend on active geometry and steady conditions; they do not describe a full distribution of velocities, residence times or treatment performance.
Return viscousDrop = viscousCoefficient*velocity*depth, inertialDrop = inertialCoefficient*velocity*abs(velocity)*depth and totalDrop as their sum.
When to use this tool
Use Biofilter One Layer Pressure Drop when checking one supplied hydraulic loading, clearance, volume or travel-time term.
How to use the tool and how it works
- Enter viscousCoefficient, inertialCoefficient, velocity, depth. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read viscousDrop, inertialDrop, totalDrop. Use the output convention below.
Require nonnegative viscousCoefficient, inertialCoefficient and depth; velocity may be signed. Return viscousDrop = viscousCoefficient*velocity*depth, inertialDrop = inertialCoefficient*velocity*abs(velocity)*depth and totalDrop as their sum.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| viscousCoefficient | Viscous Coefficient | Required. Finite number; minimum 0. |
| inertialCoefficient | Inertial Coefficient | Required. Finite number; minimum 0. |
| velocity | Signed velocity; reversal reverses both pressure-drop terms. | Required. Finite number. |
| depth | Depth | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| viscousDrop | Viscous Drop | Required. Finite number. |
| inertialDrop | Inertial Drop | Required. Finite number. |
| totalDrop | Total Drop | Required. Finite number. |
{
"input": {
"viscousCoefficient": 10,
"inertialCoefficient": 2,
"velocity": 3,
"depth": 0.5
},
"output": {
"viscousDrop": 15,
"inertialDrop": 9,
"totalDrop": 24
}
}Limitations and assumptions
- Choose coefficient units so each term is pressure. Reversing velocity reverses the signed drop; the coefficients are supplied rather than estimated from media geometry, fluid properties or a calibrated pressure-loss law.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use a complete hydraulic and treatment model when changing flows, turbulence, media behavior or safety margins matter.
References
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