Hydraulic Diameter

The Reynolds number is a dimensionless quantity that represents the ratio of inertial forces to viscous forces in a fluid flow. It is a key parameter in fluid mechanics used to predict flow behavior, determining whether it will be laminar, transitional, or turbulent.

Internal Flow:

Internal flow refers to fluid motion that is confined within solid boundaries, such as flow through pipes, ducts, or channels. The defining characteristic of internal flow is that the fluid is fully enclosed, leading to the development of a boundary layer along the walls. As the flow progresses, these boundary layers grow and eventually merge, resulting in a fully developed flow profile.

Hydraulic Diameter Calculation

Circular Duct,

where D is the diameter of the circular duct.

Rectangular Duct,

where W and H are the Width and Height of the rectangular duct.