Flashcards
fluids
Cards in this deck (11)
- 1densityρ = m / v
unit : kg / m^3
g / mL or g / cm^3 - 2weight of volume of fluidF g = ρ * v * g = mg
- 3specific gravityρ of water = 1 g/ cm^3
-compare density of object with density of water
-unitless - 4pressureP = F / A
unit: pascal (Pa)
1.013 x 10^5 Pa = 760 mmHg = 760 torr =
1 atm - 5absolute / hydrostatic pressuretotal pressure exerted on submerged object
P o = pressure at surface
ρgz = pressure due to fluid itself
- 6gauge pressureabsolute pressure - atm pressure
- 7buoyant force-object in fluid will generate a buoyant force that is equal to weight of fluid that it displaces
-if object is floating, buoyant force = weight of object
- 8laminar flowpoiseuille's law
ΔP = pressure gradient
n = viscosity
smooth and orderly
- 9critical speed-turbulence arises when speed of fluid exceeds critical speed
-rough, disorderly, form eddies (whirls of fluid at different sizes)
- 10continuity equation-flow rate stays constant at any area
-linear speed (v) increases when area is smaller (narrow tube) or linear speed decreases when area is larger
- 11bernoulli's equation-sum of static pressure and dynamic pressure stays constant
-more energy dedicated to dynamic pressure means less energy for static fluid movement and vice versa
-for horizontal flow: inverse relationship between pressure and speed (ex: plane)
-for vertical flow (venturi effect): direct relationship between pressure exerted on walls of tube and area -> smaller area means faster linear speed due to continuity equation so that means lower static pressure so pipe has lower water level
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- physics Flashcards on fluids , created by Subin Jang on 02/06/2019.
- Created by
- Subin Jang · Jun 2019
- Updated
- Jun 12, 2019
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