👉 Dean-Flux, named after its discoverer Robert M. Dean, is a complex flow pattern observed in highly viscous fluids, particularly Dean numbers exceeding 10^5, where the fluid exhibits a laminar boundary layer that rolls or "deans" downstream. This rolling motion creates secondary flows that significantly alter the fluid's velocity profile and pressure distribution near the wall, leading to a more complex and turbulent-like flow behavior than simple Poiseuille flow. Dean-Flux is crucial in understanding the behavior of fluids in microchannels, heat exchangers, and other engineering systems where high viscosity and low Reynolds numbers are prevalent.
