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What is uniform motion of a fluid defined as?
Flow in a straight line
In a uniform flow, what is the pressure distribution in the live sections according to?
Hydrostatic law
What decreases along the uniform flow during fluid motion?
Potential energy
What does the hydraulic gradient depend on during uniform fluid motion?
Particle position
What is absent in a uniform flow, leading to corresponding head losses due to friction?
Local resistances
What forces act on an isolated section during uniform fluid motion?
Hydrodynamic pressure, gravity, and friction
What is the last equation called in the context of uniform flow?
Fundamental equation
What type of flow exhibits a layered structure without particle mixing?
Laminar flow
Why is the velocity in the layer in contact with the walls zero during laminar flow?
Adhesion to walls
In laminar flow, where is the maximum velocity achieved?
At the center of the pipe
What type of law does the velocity distribution follow in laminar flow?
Parabolic law
What is the term used for flows that are similar regardless of the Reynolds number?
Auto-modeling flows
Where does the maximum shear stress occur during laminar flow?
Pipe wall
What law is not applicable for Reynolds numbers greater than 2300 in turbulent flow?
Poiseuille Law
What happens to the particles near the center and the wall in the section near the entry into the
pipeline?
They move non-uniformly
What is the term for the length where laminar flow formation is completed?
Initial section length
What type of entrance leads to uniform isothermal laminar flow in a pipe?
Smooth entrance
What does the thickness of the slowed-down layer near the wall increase with in a pipe?
Increasing flow rate
What does the resulting uniform isothermal laminar flow correspond to in the pip
Parabolic velocity distribution
In practice, at what distance from the entrance does the velocity distribution not differ significantly from
the parabolic distribution?
Infinitely far away
What is the relationship between the length of the inlet section (L) and the Reynolds number (Re) for
laminar flow?
L = 0.28 Re
At what length does the formation of turbulent flow occur?
L = (40-50)d
What does the velocity profile of laminar flow form in a length of L?
Parabolic profile
What is the initial section length in laminar flow often referred to as?
Transition length
What law is not applicable for Reynolds numbers greater than 2300 in turbulent flow?
Poiseuille Law
What happens to the particles near the center and the wall in the section near the entry into the
pipeline?
They move non-uniformly
What is the term for the length where laminar flow formation is completed?
Initial section length
What type of entrance leads to uniform isothermal laminar flow in a pipe?
Smooth entrance
What does the thickness of the slowed-down layer near the wall increase with in a pipe?
Increasing flow rate
What does the resulting uniform isothermal laminar flow correspond to in the pipe?
Parabolic velocity distribution