(1)    Gravity force (Fg) :

It is due toe weight of the fluid

(2)    Pressure force (Fp) :

It is due pressure gradient between two points in the direction of flow.

(3)    Viscous force (Fv) :

It is due to viscous property of the flowing fluid.

(4)    Turbulent force (Ft):

It is due to turbulence of the flow.

(5)    Compressibility force (Fc) :

It is due to elasticity property of fluid

Net force  =  F_g + F_p + F_v + F_t + F_c

•    If compressibility effect on the fluid is negligible, the

Net force  = F_g + F_p + F_v + F_t

This equation is called as Reynold’s equation of motion. It is useful in the study of the turbulent flows.

•    If compressibility and turbulence effects on the fluid is neglected then,

Net force = F_g + F_p + F_v

This equation is called as Nervier – stocks equation fo motion. It is useful in the study of voices flow.


•    If fluid flow is consider as an ideal flow then

Net force =  F_g = F_p

This equation is called as Euler’s equation of motion. It is useful in the study of ideal fluid and also in real fluid where viscous force is negligible.

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