The
models of centrifugal pumps are tested in order to know the performance of the
prototypes. Models and prototypes are compared based on geometric similarity,
kinematic similarity and dynamic similarity.
When the ratio of all the corresponding linear dimensions of the model and the
prototype are equal, then they are said to have geometric similarity. In other
words, geometric similarity is said to exist between the model and the
prototype, if both of them are identical in shape, but differ only in size.
When the ratio of corresponding velocities at corresponding points are equal,
then the model and the prototype are said to have kinematic similarity.
When the ratio of corresponding forces acting at corresponding points are
equal, then the model and the prototype are said to have dynamic similarity.