Investigation of nanofluid transport in a corrugated channel under pulsating effect

The present research numerically illustrated the effect of pulsating turbulent flow and single-walled carbon nanotubes/water, SWCNT-H2O nanofluid in a corrugated channel on hydrothermal characteristics and entropy production. Two various models for describing the flow of nanoparticles in a base fluid are applied. These models are homogeneous single-phase, SPM and Lagrangian-Eulerian model (or discrete phase model), DPM. This simulation covers the Reynolds number, pulsation frequency, phase shift, and nanoparticles concentration in the range of (for steady flow: 4000 ≤ Re ≤10000 and for pulsating flow:4000 ≤ Re ≤7000), (1 ≤ f≤ 5), (0o ≤ θ ≤180o) and (0% ≤ φ ≤ 3%), respectively. CFD simulations show that the pulsation frequency, f, and phase shift, θ have a significant role in improving the heat transfer ratio and controlling the entropy generation through the wavy channel. Finally, it is recommended to use SWCNT/water nanofluid with a high volume fraction (φ=3%) as a working fluid in the considered channel due to its high heat transfer ratio and low thermal irreversibility.