2.6 Fluid Mechanics
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19 Terms
What is the formula for pressure ?
unit : 1 Pa (=) 1 N.m^-2
On average, what is the air pressure ?
1013 hPa
How do you translate bar to pascal ?
How compressible are solids and liquids ?
In most cases, we can assume that the mass density of solids and liquids is not very dependent on external pressure, they are almost incompressible
How compressible are gasses ?
Because of their significantly lower density, their volume is strongly dependent on external pressure, they are highly compressible
What is the expression of compressibility ?
Why does pressure increase with depth in a fluid?
Each thin horizontal layer of fluid has a weight (ρ⋅V⋅gρ·V·gρ⋅V⋅g) that acts on the layer below. The deeper you go, the more layers are stacked above, so the pressure increases with depth.
What is the expression for the gravitational pressure ?
What is the buoyant force ?
When a body is immersed in a fluid, due to gravitational pressure, it experiences a force that counteracts thei weight force,
How is buoyancy developped ?
It is caused by the body experiencing a higher pressure from its underside than from its upper side (due to the height-dependence)
What is the Archimedes’ principle ?
The body only floats if the weight of the submerged body is less than the buoyant force
Describe the movement of the flow field :
A flow field results from many individual particles with a spatial velocity distribution.
Mathematically it’s described as a vector field of velocity vectors for these same particles.
Name the 2 different types of flow :
Laminar and Turbulent
What are the 3 conservations laws of fluid mechanics :
Law of conservation of mass (continuity equation, flow equation)
Law of conservation of energy (Bernoulli equation)
Law of Conservation of momentum
What is the general formula for volume flow ?
What is the formula for mass flow ?
What is the formula for the volume flow using the area
What is the bernoulli equation ? Describe the different parts of the equation & write the demonstration
The first summand is also referred to as dynamic pressure, the second as geodetic pressure (pressure at the bottom due to the gravitational pressure), and p as static pressure.
