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Model Laws or Similarity Laws

•    The ratio of the corresponding forces acting at the corresponding points in the model and prototype should be equal, for the dynamic similarity between the model and the prototype.

•    This means that the dimensionless numbers should be same for the model as well as the prototype.

•    Actually it is very difficult to satisfy the condition that all dimensionless number are same for both model and prototype.

•    The models are designed on the basis of the force which is dominating in the flow situation.

•    The laws on which models are designed for dynamic similarity are called as model laws or similarity law.

Following are the models laws:

(1) Reynolds model law          (2) Froude model law            (3) Euler model law
(4) Weber model law               (5) Mach model law

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