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Summary: Engineering Fluid Mechanics | donald f elger
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Read the summary and the most important questions on engineering fluid mechanics | donald f. elger
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1 Building a solid foundation
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1.3 Idealizing matter
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what is microscopic and macroscopic vieuwpoints
Microscopic vieuwpoint describes material behavior by characterizing the behavior of atoms and molecules. It is useful for understanding phenomena susch as surface tension and viscosity.
Macroscopic vieuwpoints describes material behavoir without resulting to models at the atomic level. Its simpler and used more often.
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What is the continuum assumption
fluid behaves as if it were comprised of continuous matter that is infinitely divisible into smaller and smaller parts
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what is a fluid particle
Its a small quantity of fluid with fixed identity.
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what is a fixed identity
It means that the particle is always comprised of the same matter.
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1.8 Checking for dimensional homogeneity (DH)
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When is the equation Dimensional Homogeneity (DH)?
When the primary dimensions of each term of a equation are the same
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What is a dimensionless group?
It's any arrangement of variables in which the primary dimensions cancel. They are also called
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2 Fluid properties
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2.3 modeling fluids as constant density
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For what is the bulk modulus of elasticity EV(kPa) used?
To characterize compressibility
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what is the Mach number?
The Mach number is the ratio of the speed of the flowing fluid V to the speed at which sounds travels in the fluid c
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2.5 describing viscous effects
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What is the viscosity µ?
Its the fluid property that characterizes resistance to flow: shear stress/ rate of shear strain
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What is the shear force Fs?
Shear force Fs is the net force on a body due to shear stress acting over the body
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