3650 fluid dynamics Flashcards

1
Q

gas

A

molecular proximity defined by container

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2
Q

states of substances

A

gas liquids solids but all fluids and beyond solid are plasmas

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3
Q

dynamic forces

A

lift and drag

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4
Q

static forces and what they depend on

A

pressure and buoyancy - position, size, structure

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5
Q

pressure

A

acting down on the substance

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6
Q

weight

A

mg, pulling the substance down

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7
Q

drag (2)

A

resistive force that results from DISORDERLY collisions with fluid molecules
opposing the action

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8
Q

lift

A

pushing object up

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9
Q

buoyancy (2)

A

supportive force produced by displacement of ORDERLY fluid molecules
- initially would not have if we dont have it in order until the fluids rearrange itself
pushing object up

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10
Q

density and buoyancy

A

less dense -buoyant

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11
Q

sum of Fy

A

-RU-w+RB

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12
Q

RU and RB depends on

A

volume

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13
Q

w depends on

A

mass

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14
Q

density

A

mass/volume

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15
Q

if the object has more volume

A

more buoyant

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16
Q

object density =1

A

stay in the middle

17
Q

object density <1

18
Q

object density >1

19
Q

drag increases with (4)

A

object cross section
fluid density
object velocity
fluid flow parameters

20
Q

laminar vs turbulent flow

A

straight undisturbed layers vs tiny disturbed whirpools

21
Q

with drag in the front

A

laminar flow tears up to create turbulent flows - disorganized

22
Q

laminar flow range (I)

A

smooth surface/low velocity - attract fluid molecules to it (surface layer) because of collisions of molecules equals high surface drag

23
Q

partially turbulent flow range (I)

A

pair of separation points with more velocity - some form drag
turbulent low pressure wake in the back
decreased surface drag
decreased support of fluid force from behind

24
Q

Partially turbulent flow range (II)

A

high velocity - more formed drag
little surface dry
decreased boundary
earilier separation point of boundry layer

25
with rougher surface
more surface drag, full turbulent flow follows keeping the support behind
26
if normal velocity puts it at the top end of 2, better to make surface
rougher - to make the fluid more viscous so the boundry layer becomes fuller
27
magnus effect
on top you have lower velocity and high pressure below you have high velocity and low pressure - pushing it down boundary layer of air spinning with ball's surface - surface drag surface thrust - pulls molecucles higher
28
gear effect
the ball keeps on bending - spin of the ball
29
lift
supportive force produced by relative pressure on opposite sides of an object
30
an object with a bump on its back
low pressure/high velocity on top and high pressure/low velocity on the bottom so it gets lifted - packet of air ends up at the same time