Question

mechanic fluids

must do all 4 questions

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until Thursday 12/5/2019 at 9 am to complete the Quiz. ick! Question 1 5 pts What are the dimensions of roughness and relative roughness of a pipe? Length/time for roughness and dimensionless for relative roughness Length for roughness and dimensionless for relative roughness Dimensionless for roughness and length time for relative roughness Dimensionless for roughness and length for relative roughness Question 2 5 pts What is the name of the equation you would use to calculate major head losses in pipe flow? Darcy Welsbach Equation Bernoulli equation Moody Equation Continuity Equation D Question 3 5 pts The Moody diagram is used for determining:

Answer 1

Question 1

dimension of roughness is meter ( SI unit of length but is is generally measured in mm )

relative roughness is the ratio or roughness and diameter of pipe so it is a dimensionless number.

correct option ;- length for roughness and dimensionless for relative roughness

Question 2

correct option :- Darcy weisbach equation

this equation relates head loss ( or pressure loss ) due to friction to flow velocity in pipe.

Question 3

Moody diagram show the graphical relation between Friction factor ( used in darcy weisbach equation ) to the raynolds number.

so correction option :- it is use to determine " Friction Factor "

Question 4

value for critical raynolds number is 2000. In our question, that number is 50 which is well below critical value so our flow will be laminar.

Correct option :- Laminar