Quiz Four Flashcards
What are the major/minor frictional energy losses?
The two major frictional energy losses are due to the viscous forces from the internal friction between the different layers of fluid during flow and the frictional forces between the fluid and the wall of the pipe while the minor frictional energy loss is energy loss due to a sudden expansion/contraction during fluid flow
What are major frictional energy losses dependent on?
They are dependent on the flow rate (Reynold’s number) and the surface roughness of the pipe
How do you calculate the fanning friction factor?
You can calculate the fanning friction factor using the Moody diagram
What is the Darcy equation?
The Darcy equation is the change in pressure divided by the density is equal to two times the friction factor times the length of the pipe times the velocity to the second power divided by the diameter
How do you calculate the fanning friction factor during laminar flow?
The fanning friction factor for fluids in laminar flow is 16 divided by reynolds number
What is the Hagen-Poiseuille equation for laminar flow?
The Hagen-Poiseuille equation for laminar flow is the change in pressure is equal to 32 times the viscosity times the average velocity times the length of the tube divided by the diameter squared
How do you calculate the energy lost due to pipe fittings?
The energy lost due to pipe fittings is the change of pressure divided by the density is equal to cff times the velocity to the negative second power divided by 2
What is the Bernouilli equation?
The Bernoulli equation states that the energy is conserved during fluid flow within a pipe
What are some assumptions of the Bernoulli equation?
Some assumptions of the Bernoulli equation are that locations one and two are part of the same streamline, the density is constant, the flow is steady, the fluid has no viscosity, and there is no heat transfer between fluid surroundings
What is the pump power calculation? List the units.
The pump power calculation is phi is equal to the mass flow rate times e sub p. Power is in joules/s (or watts), mass flow rate is in kg/s, and e sub p is in joules/kg
