Question

What is meant by boundary layer theory.

Answer 1

Boundary Layer

The boundary layer is the portion of fluid adjacent to the surface of an object around which the fluid is flowing. The layer is the boundary between the object and the free-flowing fluid. Due to its contact or proximity to the object, the boundary layer is affected by the object and displays flow properties that are different from those of fluid flowing farther away from the object. The boundary area is that of viscous flow, which is subject to friction from the surface of the object and heat transfer from the object, and thus is ruled by its own set of equations derived from the Navier-Stokes equations.