Bezwymiarowy współczynnik strat λ 
 
Korzystając z prawa Maigena-Paisenlliego 
Q=π∆pR

4

/(8µl) 

Q=v

śr

*F 

v

śr

=Q/F 

F=π* R

2 

d

l

g

v

d

d

v

l

g

v

d

l

g

v

p

g

ni

d

v

d

l

v

d

l

v

R

l

v

d

l

v

d

l

v

p

R

p

l

v

R

l

p

R

l

p

v

v

v

l

R

p

R

R

l

p

v

ś

r

ś

r

ś

r

ś

r

ś

r

ś

r

ś

r

ś

r

ś

r

ś

r

ś

r

ś

r

ś

r

⋅

⋅

⋅

⋅

=

⋅

⋅

⋅

⋅

⋅

=

⋅

⋅

⋅

=

∆

⋅

=

⋅

=

⋅

⋅

=

⋅

⋅

⋅

=

⋅

⋅

⋅

=

⋅

⋅

=

⋅

⋅

⋅

=

∆

⋅

∆

=

⋅

⋅

⋅

⋅

⋅

∆

=

⋅

⋅

⋅

⋅

∆

=

=

⋅

⋅

⋅

∆

=

⋅

⋅

⋅

⋅

∆

⋅

=

Re

2

64

2

64

32

Re

32

)

2

(

8

8

Re

32

)

2

(

8

4

2

8

2

8

8

2

2

2

2

2

2

2

2

2

2

2

max

max

2

2

4

ν

ν

µ

λ

µ

µ

µ

µ

µ

µ

µ

µ

µ

π

µ

π

 

Porównując ten wzór ze wzorem na straty Darcy’ego 

Re

64

2

Re

2

64

2

2

2

2

=

⇒

⋅

−

=

⋅

⋅

⋅

⋅

⋅

=

∆

λ

ρ

λ

ρ

λ

ś

r

ś

r

ś

r

v

d

l

d

l

g

v

v

d

l

p