Laminar impinging streams

The major disadvantage of the mirror image model is that the interaction between the two opposing streams in impingement was not considered. In fact, even in laminar impinging streams, such an interaction cannot be negligible. 

Movement. Fluid movement need not be excessive to damage a material. Much depends on the nature of the fluid and the hardness of the material. A geometric shape can create a sustained delivery of fluid or can locally disturb a laminar stream and lead to turbulence. Replaceable baffle plates or deflectors are beneficial where circumstances permit their use they eliminate the problem of impingement damage to the stmctur-ally significant component. 

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