Here is my equation in which I am trying to calculate the uncertainty in a measu
ID: 1862577 • Letter: H
Question
Here is my equation in which I am trying to calculate the uncertainty in a measurement of the coefficient of skin friction of turbulent flow through a large pipe. In the equation, I am actually measuring with sensors the velocity of the flow (V), the diameter of the pipe (D), and the temperature (T) and pressure (P) of the flow. Density is calculated as a function of temperature and pressure. It is worth noting that the working fluid of the analysis is water.
Here are the nominal values and their respective uncertainties:
V = 2 m/s
D = 1 m
T = 450 K
P = 7 MPa
uncertainty in V = +/- 0.02 m/s
uncertainty in D = +/- 0.001 mm
uncertainty in T = +/- 0.6 K
uncertainty in P = +/- 0.0175 MPa
Also worth noting is that the nested expression:
has an uncertainty associated with it as well of +/- 2.5 %
Here, density (rho) is given as a function of temperature and pressure and will likewise have an uncertainty associated with it as well.
I need to calculate the total uncertainty in the coefficient of skin friction Cf for which the equation is solved for.
Explanation / Answer
Here is my equation in which I am trying to calculate the uncertainty in a measu
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