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Weber’s Model Law

The law is which models are based on Weber’s number is called as Weber’s model law.

Whenever surface tension forces are predominant as compare to other forces for dynamic similarity, Weber number in model must be equal to Weber number in prototype.

Wm = Wp

Vm / √ σm / ρm Lm = Vp / √ σp / ρp . Lp

Weber’s model law is applicable in following case:

(i)    Capillary movement of water in soil.
(ii)    Study of droplet, study of very small jet.
(iii)    Capillary waves in channels
(iv)    Flow over weirs for small heads.

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