E-CodePipe friction: Colebrook, Darcy-Weisbach — a TI-84 Plus CE program
PIPEFR is a TI-BASIC program for the TI-84 Plus CE. Reynolds number, Darcy friction factor (Colebrook iterated; 64/Re when laminar) beside Haaland's explicit form, head loss and pressure drop.
What it asks for and what it shows
It asks for 6 values at its prompts. In the example below it shows V M/S, RE, F DARCY, F HAAL, HEAD M, DP KPA.
Example run
One of its oracle test cases: “water in commercial steel”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Input 1 | 20 |
| Input 2 | 150 |
| Input 3 | 100 |
| Input 4 | 0.045 |
| Input 5 | 998 |
| Input 6 | 1 |
| The screen shows | |
V M/S= | 1.131768484 |
RE= | 169425.7421 |
F DARCY= | 0.0180813479 |
F HAAL= | 0.01785146995 |
HEAD M= | 0.7869655707 |
DP KPA= | 7.704691984 |
How it's checked
5 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 35 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “Pipe friction: Colebrook, Darcy-Weisbach” (PIPEFR).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
Related programs
- Pipe network: series + parallel
- Terminal settling velocity of a sphere
- Flat-plate boundary layer and drag
- Venturi meter and Pitot tube
- Open channel: Manning, critical depth
All TI-84 Plus CE engineering programs · All TI-84 Plus CE programs