해저관로설계_The stability of the vortex shedding

소개

해저관로설계시 주어진 조건에 대한 The stability of the vortex shedding 계산입니다.
순차적으로 자세하게 나와 있습니다.

목차

Contents

Example1. The stability of the vortex shedding3
Condition. 3
Solution. 4 - 6

Example2. Then stable length? 7
Conclusion. 7

본문내용

The velocity of a moving fluid : 3ft/sec
Solution.
Re Number
= 3.5 X 105
Vortex shedding frequency
Here, Strouhal Number(S) is calculated by chart 3.21
When design the sea bottom pipe, mostly Strouhal Number is used 0.2
= 0.514cps
quency of span length
Here, Di is internal diameter.
Di = D 2t = 14inch 2 X 0.5 inch = 13inch
= 483.76 inch4
①EI = 3 X 107 X 483.76 inch4 = 1450 X 107 lb inch2
= 10.07 X 107 lb ft2
Sea bottom pipe weight Wa per unit length in the air condition.
Sea bottom pipe weight Ma per unit length.
= 2.24 Slug/ft
Supply mass
= 2.13 Slug/ft
Sea bottom pipe total weight M per unit length.
②M = 2.24 + 2.13 = 4.37 Slug/ft
According to
= 0.5323 cps
Safety investigation of Sea bottom pipe about Vortex shedding
Because of this condition is 0.366cps, pipe is not safe Vortex shedding
Example2. Then stable length?
∴ L ≤ 126.72 ft
Conclusion.
vortex shedding.

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