1. ME 340: Heat Transfer Project “The H Calculator”
By: Michael Koecher &
Tyler Collins

2. Why?
We’ve all calculated lots of h values this semester This is convenient for fast error checking

3. MatLab Steps 1) Input: k, alpha, Pr, velocity, viscosity, density, cp.
2) Choose geometry: sphere, external cylinder flow, internal cylinder flow, or flat plate.
3) Beware: equations that use viscosity/viscosity_s use an approximation of 1
4) It outputs the results (Nu and h) to the command prompt.

4. Example 8.37a (Internal Flow)
1. Input data
2. Select Internal Flow
3. Input diameter, length, and select heating

5. Example 8.37a continued
The h value calculated (using Dittus) is:
The h value calculated (using Sieder) is:
The actual value is 9.44

6. Example 7.70a (Sphere) 1. Input data H calculated is: 3651
H actual is: 3639

7. Example 7.70b (Sphere)
H calculated is: 23.72
H actual is: 22.1