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Flashcards in Basics Deck (19)
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1
Q

Types of approach in studying a control volume

A

1) lagrangian approach

2) Eulerian approach

2
Q

Types of derivative

A

1) partial derivative
2) total derivative
3) substantial derivative

3
Q

Classification of flow

A

1) steady/ unsteady
2) uniform/ non-uniform
3) laminar/ turbulence
4) compressible/ incompressible
5) rotational/ irrotational
6) potential flow
7) couette flow

4
Q

Types of flow lines

A

1) stream line
2) path line
3) streak line

5
Q

Fluid dynamics

A

1) kinematic

2) kinetics or dynamics

6
Q

Fluid kinematic

A

Without considering the effect of force

7
Q

Fluid kinetics

A

Considering the effect of force

8
Q

Partial time derivative

A

Standing on a bridge and measuring fish concentration

Location is fixed

9
Q

Total time derivative

A

1) moving on a boat and measuring fish concentration

Velocity of observer not equal to velocity of stream

10
Q

Substantial time derivative/ material time derivative

A

Climb on a canon and observe the fish

Velocity of observer = velocity of stream

11
Q

Reynolds number of flat plate

A

3*10^5 less than that - laminar

5*10^5 greater than that - turbulent

12
Q

Reynolds number of Pipe

A

Less than 2000 laminar

Greater than 4000 turbulent

13
Q

Reynolds number of packed bed

A

5 to 10 - laminar

14
Q

Mach number

A

Inertial force/ elastic force

V/ velocity of sound

15
Q

Compressibility

A

Mach > 0.2 compressible

< 0.2 incompressible

16
Q

Rotational flow

A

Earth

Along stream line and own axis

17
Q

Types of system

A

Open system / control volume system

Closed system / control mass

Isolate system

18
Q

Archimedes principle

A

The buoyancy force on a body is equal to the weight of the fluid displaced by the body

19
Q

Buoyancy force

A

It is the upward force exerted by the fluid against the weight of the body immersed

= density of fluid * gravity * volume of water displaced