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13 Cards in this Set
- Front
- Back
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pressure under fluid =
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p2=p1 + density (p) * gravity (g) * height(h)
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Pressure vs shape
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shape does not change pressure
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Pascals principle
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When external force is applied to a confined liquid it is transmitted unchanged to every point within fluid.
Can have different pressure based on height but each will have same force applied |
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buoyancy- Archmidedes principle
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an object immersed partially or fully will feels a buoyant force equal to the weight of fluid displaced
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Hygrometers
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measures density of liquid
sinks to level where matches the liquid less dense liquid = hygrometer sink further More dense= sinks less |
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Bernoulli's Effect
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Speed of fluid increases pressure decreases within fluid
i.e, shower curtain example |
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Venturi tube
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speed of fluid (gas) creates lower pressure in gas therefore atmospheric air comes in through opening in tube. size of the openings in tube and flow rate will determine the percent oxygen deleivered
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viscosity
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measure of a fluids resistance to flow
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Reynolds #
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Increase in Reynolds number more likely to have turbulent flow
1500-2000 more likely to switch from laminar to turbulent flow |
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Reynolds equation
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Re= v (velocity) * d (diameter) * e (fluid density)/v(viscosity)
Increases in velocity, diameter, and density more likely to have turbulent flow increase in viscosity more likely to have laminar |
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laminar
turbulent |
laminar- smooth more orderly and predictable (want it)
Turbulent- Less predictable chaotic |
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Equation of continuity
Flow rate |
Flow rate = m^3/s volume/time = A(area) * V (velocity)
A1 * V1= A2 * V2 |
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Poiseuille's equation
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Flow rate= P1-P2 (pressure difference across tube) * pie *radius^4/ 8 * V (viscosity) *L (tube length)
Radius biggest factor So as pressure difference increases and radius gets larger flow increases. As viscosity and tube length increase flow rate decreases |
