Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure. Daniel Bernoulli first proposed this principle in 1738 while investigating fluid dynamics and dynamics of gases. Bernoulli's principle explains various phenomena in fluid dynamics such as how aircraft wings generate lift and how venturi meters can be used to measure fluid flow rate. It is widely used in various engineering applications involving fluid flow.

1. LOADING........

2. FLUID
BERNOULLI’S PRINCIPLE

3. BERNOULLI’S PRINCIPLE
DE F I NI T I ON
F O R MU L A
F I GURE
A P P L I CA T I ON I N
DAI L Y L I F E
E X A MP L E O F
QUE S T I ON

4. Bernoulli’s Principle
T h i s s t a t e me n t wa s p r o p o s e d f o r
t h e f i r s t t i me b y D a n i e l
Be r n o u l l i (1700-1782), s o t h i s
p r i n c i p l e i s k n o wn a s
Be r n o u l l i ’s P r i n c i p l e .

5. BERNOULLI’S PRINCIPLE
DE F I NI T I ON
F O R MU L A
F I GURE
A P P L I CA T I ON I N
DAI L Y L I F E
E X A MP L E O F
QUE S T I ON

7. The work by force F1 on the pipe with
cross-sectional area A1 are:
So that will be
obtained:

8. The work by F2 in the pipe with cross-
sectional area A2 are:
W2 is negative marked (--) because the direction of
force (F 2) against the direction of motion (transfer)
fluid. So, we can write like this:

13. BERNOULLI’S PRINCIPLE
DE F I NI T I ON
F O R MU L A
F I GURE
A P P L I CA T I ON I N
DAI L Y L I F E
E X A MP L E O F
QUE S T I ON

14. WHO IS
THAT ?

15. Da n i e l Be r n o u l l i wa s a Swi s s
p h y s i c i s t a n d a ma t h e ma t i c i a n . O n e
o f t h e i mp o r t a n t t h o u g h t s i n
p h y s i c s i s t h e Be r n o u l l i e q u a t i o n
o n t h e t u b e c u r r e n t u s e d f o r t h e
me a s u r e me n t o f f l o w v e l o c i t y d u e
t o t h e p r e s s u r e .
Hi s c h i e f wo r k i s h i s
H y d r o d y n a m i q u e (H y d r o d y n a m i c a )
t h a t p u b l i s h e d i n 1738. I n
H y d r o d y n a m i c a (1738) h e l a i d t h e
b a s i s f o r t h e k i n e t i c t h e o r y o f
g a s e s , a n d a p p l i e d t h e i d e a t o
e x p l a i n B o y l e 's l a w .
He wo r k e d wi t h Eu l e r o n
e l a s t i c i t y a n d t h e d e v e l o p me n t o f
t h e E u l e r -B e r n o u l l i b e a m e q u a t i o n .
B e r n o u l l i 's p r i n c i p l e i s o f
c r i t i c a l u s e i n a e r o d y n a mi c s .

16. BERNOULLI’S PRINCIPLE
DE F I NI T I ON
F O R MU L A
F I GURE
A P P L I CA T I ON I N
DAI L Y L I F E
E X A MP L E O F
QUE S T I ON

20. Venturimeter is an instrument for efficiently measuring fluid
flow rate in a piping system

21. Venturimeter is an instrument for efficiently measuring fluid
flow rate in a piping system

22. 2 ' gh
v1 2
A1
1
A2

23. 2 gh
Q A1 2
A1
1
A2

29. Pitot tube is a
pressure
measurement
instrument
used to
measure fluid
flow velocity
2 ' gh
v

31. (influence of the form of plane)
(by a machine of plane) (friction between the
airplane and air)
(influence of the gravitation)

32. Se c t i o n o f
A i r p l a n e ’s Wi n g s
 Lift force of airplane >
weight of airplane
 Speed of Airplane must be
bigger for enlarge lift force of
airplane
 Size of airplane must be
bigger so that lift force of
airplene is bigger
1 2 2
F1 F2 A v2 v1
2

33. BERNOULLI’S PRINCIPLE
DE F I NI T I ON
F O R MU L A
F I GURE
A P P L I CA T I ON I N
DAI L Y L I F E
E X A MP L E O F
QUE S T I ON

35. It’s Time for Question