Fluid flow and heat transfer over corrugated backward facing step channel

Abstract The convective heat transfer and flow field characteristics through a backward-facing step (BFS) channel combined with corrugated wall is investigated numerically experimentally. Uniform flux applied on 200 mm of the downstream wall, while rest walls are considered isolated surfaces. range Reynolds number (Re) was between 5000 20,000. governing equations were solved using RNG k ? e turbulent model. effects wavelength amplitude height friction factor Nusselt studied. results indicated that fluid in BFS significantly enhanced increased friction. average increase rate experiment 40.7% 46.2% respectively. simulation comparable to experimental ones. According simulations, an 4 mm 20 mm has highest enhancement, reaching performance evaluation criterion 1.33 at Re.