E-CodeStefan tube: evaporation by diffusion — a TI-84 Plus CE program
STEFTUBE is a TI-BASIC program for the TI-84 Plus CE. Steady diffusion through a stagnant gas film: molar flux, mass flux, and the time for the liquid level in the tube to fall.
What it asks for and what it shows
It asks for 9 values at its prompts. In the example below it shows N MMOL, G/M2H, DROP H.
Example run
One of its oracle test cases: “water in air tube”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Input 1 | 1.5ᴇ-5 |
| Input 2 | 101325 |
| Input 3 | 300 |
| Input 4 | 0.1 |
| Input 5 | 0.15 |
| Input 6 | 3500 |
| Input 7 | 0 |
| Input 8 | 998 |
| Input 9 | 18.015 |
| The screen shows | |
N MMOL= | 0.2141977381 |
G/M2H= | 0.01389158011 |
DROP H= | 4490.129958 |
How it's checked
4 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 18 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 “Stefan tube: evaporation by diffusion” (STEFTUBE).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
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- Semi-infinite solid / diffusion
- RC circuit charging transient
- Cantilever beam deflection
All TI-84 Plus CE engineering programs · All TI-84 Plus CE programs