An interactive introduction to MATLAB

4.2the if-else statement 55

Exercise 7: Decision making (continued)

4. (continued) The friction factor,f, is calculated as:

f=







64

[Re whenRe^62000

−2.01·ln

[−5.0452

Re ln

(5.8506

Re0.8981

)]]− 2

whenRe > 2000

Write a function that calculates the energy loss per mass of flowing

fluid for a fluid flow in a pipe, given the pipe diameter, pipe length, fluid

volumetric flow rate, fluid density, and fluid viscosity (all in SI units). Test

your function with:D=0.2 m,L=10 m,Q=1 m^3 /s,ρ=1000 kg/m^3

andμ=0.001 kg/ms.

[Answer: 47.0948 J/kg ]

Exercise 7 Solutions

(http://www.eng.ed.ac.uk/teaching/courses/matlab/unit04/Ex7-
Solutions.shtml)

Additional Exercises
You should now attempt questions from Chapter C.4.

Advanced Topic

If you are interested, read about theswitchstatement in Appendix A.