Peristaltic rotating motion of couple stress nanofluid affected by Soret and Dufour effects: An application to nanotechnology

Abstract This study analyzes the effects of thermal radiation in a rotating frame with the peristaltic motion of couple stress nanofluids. The channel rotates at a constant angular speed around the z ‐axis and is filled with a couple stress fluid. Heat and mass transfer effects, including thermo‐diffusion (Dufour) and thermal‐diffusion (Soret) effects, are considered along with convective boundary conditions and viscous dissipation. The study aims to understand the behavior of nanofluids under rotation, influenced by thermophoresis and Brownian motion. The governing nonlinear equations are transformed into a dimensionless form under the assumptions of long wavelength and low Reynolds number and are solved numerically using the MATHEMATICA NDSolve function. The results reveal that rotation enhances the primary velocity while reducing the secondary velocity. The Soret and Dufour effects significantly influence concentration distribution, while thermophoresis and Brownian motion exhibit opposite impacts on temperature and concentration. The analysis of isotherms and concentration contours highlights variations in temperature and nanoparticle distribution. These findings provide valuable insights into the interplay of rotation, peristalsis, and nanofluid transport, with applications in biomedical engineering, microfluidic systems, and industrial heat exchangers.