In laminar flow, the pressure drop equation does not include surface roughness parameters, unlike turbulent flow, because the flow remains smooth and orderly. The discussion highlights that the boundary layer velocity at the wall is effectively zero, indicating no slip condition. This contrasts with turbulent flow, where surface roughness significantly affects pressure drop due to chaotic fluid movement. The conversation emphasizes the fundamental differences in flow behavior between laminar and turbulent states. Understanding these principles is crucial for accurate fluid dynamics analysis.
