06.09.2021 Views

Basics of Fluid Mechanics, 2014a

Basics of Fluid Mechanics, 2014a

Basics of Fluid Mechanics, 2014a

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

310 CHAPTER 9. DIMENSIONAL ANALYSIS<br />

Table -9.8. Common Dimensionless Parameters <strong>of</strong> <strong>Fluid</strong> <strong>Mechanics</strong> (continue)<br />

Standard System<br />

Name Symbol Equation Interpretation Application<br />

Ekman<br />

Number<br />

Euler<br />

Number<br />

Ek<br />

Eu<br />

ν<br />

2l 2 ω<br />

P 0 − P ∞<br />

1<br />

pressure<br />

potential<br />

2 ρU2<br />

viscous forces<br />

Coriolis forces<br />

effects<br />

inertia effects<br />

geophysical flow<br />

like atmospheric<br />

flow<br />

potential <strong>of</strong> resistance<br />

problems<br />

Froude<br />

Number<br />

Fr<br />

U<br />

√ gl<br />

inertia effects<br />

gravitational effects<br />

open channel flow<br />

and two phase flow<br />

Galileo<br />

Number<br />

Ga<br />

ρgl 3<br />

μ 2<br />

gravitational effects<br />

viscous effects<br />

open channel flow<br />

and two phase flow<br />

Grash<strong>of</strong><br />

Number<br />

Gr<br />

β ΔT gl 3 ρ 2<br />

μ 2<br />

buoyancy effects<br />

viscous effects<br />

natural convection<br />

Knudsen<br />

Number<br />

Kn<br />

λ<br />

l<br />

LMFP<br />

characteristic length<br />

length <strong>of</strong> mean<br />

free path, LMFP,<br />

to characteristic<br />

length<br />

Laplace<br />

Constant<br />

La<br />

√ 2 σ<br />

g(ρ 1 − ρ 2 )<br />

surface force<br />

gravity effects<br />

liquid raise,<br />

surface tension<br />

problem, also<br />

ref:Capillary<br />

constant<br />

Lift Coefficient<br />

C L<br />

L<br />

1<br />

2 ρU2 A<br />

lift force<br />

inertia effects<br />

Aerodynamics, hydrodynamics,<br />

note<br />

this coefficient has<br />

many definitions<br />

Mach<br />

Number<br />

M<br />

U<br />

c<br />

velocity<br />

sound speed<br />

compressibility<br />

and propagation<br />

<strong>of</strong> disturbances<br />

Marangoni<br />

Number<br />

Ma<br />

− dσ l ΔT<br />

dT να<br />

“thermal” surface tension<br />

viscous force<br />

surface tension<br />

caused by thermal<br />

gradient<br />

Morton<br />

Number<br />

Mo<br />

gμ 4 c Δρ<br />

ρ 2 cσ 3<br />

viscous force<br />

surface tension force<br />

bubble and drop<br />

flow<br />

Ozer<br />

Number<br />

Oz<br />

C D<br />

2 Pmax<br />

ρ<br />

( Q max<br />

A ) 2 “maximum” supply<br />

“maximum” demand<br />

supply and demand<br />

analysis<br />

such pump & pipe<br />

system, economy<br />

Continued on next page

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!