شبيه سازي انتقال حرارت نانوسيال در كانال هاي مواج با هندسه هاي مختلف

Abstract In this study, convective heat transfer enhancement in a channel/tube equipped with three rib geometries (rectangular, trapezoidal, an‎d triangular) was investigated using a nanofluid with volume fractions of 1%, 2%, an‎d 3%. Numerical simulations were performed at Reynolds numbers of 10,000, 13,000, an‎d 15,000. The main parameters eva‎luated were pressure dro‎p (ΔP), average Nusselt number (Nuavg), an‎d the thermo-hydraulic performance factor (PEC). The results showed that adding ribs disturbs the flow, creates vortices, an‎d increases mixing, which improves heat transfer compared with the plain tube; however, it also increases pressure dro‎p. In addition, Nuavg increased when ΔP increased. Temperature contours an‎d streamlines confirmed that ribbed cases provide a more uniform temperature distribution an‎d stronger heat transfer due to flow recirculation behind the ribs. Based on PEC, the triangular rib provided the best overall performance, an‎d the maximum PEC of 1.77 was obtained at Re = 15,000 an‎d φ = 3%.

مرضيه رضازاده

ابوالحسن عسگر شمسي , ايمان فخاري گلپايگاني