What is the uncertainty of f ?

ME 495 – Homework 10

Summer 2019

 

Submission Deadline: 23rd July (Tuesday) by 5 PM

 

Note: Write your name at the top right-hand corner of the first page of your homework.

 

Problem 1:

 

 

Problem 2:

 

 

Problem 3:

 

 

 

Problem 4: For a smooth pipe, the friction factor (f) is:

 

f = (0.79 ln Re – 1.64)-2

 

What is the uncertainty of f ? Let ρ = 0.95 ± 0.1 kg/m3, U = 1 ± 10% m/s, D = 0.5 ± 0.025 m and

μ= 184.6 x 10-7 ± 5% N.s/m2

 

 

 

 

 

Problem 5:

 

 

Use Voltage as 100 V for all the cases. Part 1 was solved in class and you do not need to do this.

Only solve for Part 2 and discuss how it’s different from Part 1. Use the method discussed in class.

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