Grade lines present important data to engineers who work with designing fluid systems. Consider the energy grade lines and hydraulic grade lines - what differs between them? In detail, list three situations where there might be a difference between the two? As you have/will learn, the friction factor is an extremely important variable that engineers must consider when designing fluid systems. If you\'re a civil engineer, who\'s passed the FE exam looking for the friction factor, you might consider using Hazen Williams or Darcy Weisbach equation to determine the friction factor. List the pro\'s and con\'s as to which one might be the most appropriate to determine f. Which would you like is used most often? Which is the most accurate? T/F - Can the Darcy-Weisbach equation and Moody Diagram be used for fluids other than water? Explain. If you wanted to compare the importance of minor vs. major losses for a specific pipeline, what dimensionless terms could you compare?
1. The Energy Line is a line that represent the total head available to the fluid.
The Hydraulic Grade Line is a line representing the total head available to the fluid - minus the velocity head.
velocity head differs between EGL and HGL.
situations where there might be difference between the two --> losses due to entries and exits, fittings and valves.
2. Hazen Williams -
The Hazen–Williams equation has the advantage that the coefficient C is not a function of the Reynolds number, but
it has the disadvantage that it is only valid for water. Also, it does not account for the temperature or viscosity of the water. Thus it is less accurate than Darcy Weisbach equation.
Darcy Weisbach equation is more accurate.
3. True. They are applicable for all incompressible fluids.
4. Reynold\'s number
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