PO.MBE.Aq.VEH.tD
Description
Calculates dimensionless time for VEH aquifer, [dimensionless]. tD = 0.00634*k*t / (phi*muw*ct*rr^2).
Syntax
=PO.MBE.Aq.VEH.tD(K, t, porosity, Uw, ct, rr)Parameters
| Parameter | Description |
|---|---|
| K | Permeability, [md]. |
| t | Time, [days]. |
| porosity | Porosity, [fraction]. |
| Uw | Water viscosity, [cp]. |
| ct | Total compressibility, [1/psi]. |
| rr | Reservoir radius, [ft]. |
SI Unit Version
Lambda Name
PO.MBE.Aq.VEH.tD.SIFormula
=LAMBDA(K, t, porosity, Uw, ct, rr, LET(
ct_1psi, PO.UnitConverter(ct, "1/kPa", "1/psi"),
rr_ft, PO.UnitConverter(rr, "m", "ft"),
PO.MBE.Aq.VEH.tD(K, t, porosity, Uw, ct_1psi, rr_ft)))SI Parameters
| Parameter | Unit | Description |
|---|---|---|
K |
- | Permeability, [mD] |
t |
- | Time, [days] |
porosity |
- | Porosity, [fraction] |
Uw |
- | Water viscosity, [cP] |
ct |
1/kPa | Total compressibility, [1/kPa] |
rr |
m | Reservoir radius, [m] |
How to save as a reusable Excel function
LAMBDA is a built-in Excel feature (Microsoft 365) that lets you create custom functions without VBA. The formula above works as-is when pasted into a cell.
To save a LAMBDA as a reusable named function:
- Go to Formulas → Name Manager → New
- Enter a name, e.g.
PO.MBE.Aq.VEH.tD.SI - In Refers to, paste the LAMBDA formula without the trailing invocation
(...) - Click OK
Now use =PO.MBE.Aq.VEH.tD.SI(...) anywhere in your workbook.