Fluid Mechanic Formular Sheet

Topics: Fluid dynamics, Fluid mechanics, Reynolds number Pages: 27 (521 words) Published: April 9, 2013
ME2135E Fluid Mechanics Formula sheet
(

)

Centrifugal Pump
Power

(

)

Head

(

)

(

Head

Capacity
Coeff

)

Head
Coeff

(

)
(

Eff

(

)



|



(

Head

⁄(
(

)(
(

)

)

(

)(

)

(

)

)

|

)

Axial Pump
Power

(





Eff

Power
Coeff

()

()

)

)

(

Head

⁄)

(

)⁄

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������������° ������������������

������������ ������������������

������

������ : Absolute Blade velocity
������ Flow velocity relative to blade
������ Absolute flow velocity
������������ Normal component of ������ ������������ Tangential component of ������

Inlet velocity triangle

ur1

V=Vn

������
ub1

Outlet velocity triangle

V2

ur2
Vn2

������

������
ub2

Vt2

Cavitation
(∑

Cavitation index:

()

∑)
()

Hydrostatic Bearing
()

(
(

(⁄)
)
)

()

( ⁄)
(⁄)
(⁄)

(

)
(⁄)
[

(⁄)

(

)

(⁄)
( ⁄ )]

A0066078X Lin Shaodun

Page 1 of 4

ME2135E Fluid Mechanics Formula sheet
(

Minimum pumping loss:



)
(



⁄)

Hydrodynamics Bearing-Inclined
()
()
()

̅

(

̅̅(̅̅̅
̅)

)

[()
()(

()

(

()

]
)

(

(

)

(

)

)

)

]

(


∫ ()

(
(

[

)

(
)


∫|

)



)


|

(

)

Hydrodynamics Bearing-Rayleigh step
(
(



)

(

⁄)

Flat Plate Boundary Layer Flow

)

Rex=5x105


Re
Laminar (Blasius
Solution)













2.59





Turbulent (1/7 Power
Lower vel. profile )









1.29



For laminar flows H varies between 2 and 3,

(normal: 1.5~2)
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