Abstract
The secondary flow of Prandtl’s second kind is a typical feature of turbulent flow in a duct with a noncircular cross section. In this paper, we proposed a physical mechanism on the formation of the secondary flow by analyzing the momentum balance along selected paths. The blocking effects of intersecting walls cause the pressure at the corner to be higher than that at the wall midpoint. Driven by the pressure gradient, fluids above the wall flow away from the corner, complemented by an inflow toward the corner along the diagonal. The proposed mechanism is confirmed using data from direct numerical simulation with the friction Reynolds number Reτ up to 900.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
