Abstract
This paper investigates the mixed convection and entropy generation of an Ag-water nanofluid in an L-shaped channel fixed at an inclination angle of 30° to the horizontal axis. An isothermal heat source was positioned in the middle of the right inclined wall of the channel while the other walls were kept adiabatic. The finite volume method was used for solving the problem’s governing equations. The numerical results were obtained for a range of pertinent parameters: Reynolds number, Richardson number, aspect ratio, and the nanoparticles volume fraction. These results were Re = 50–200; Ri = 0.1, 1, 10; AR = 0.5–0.8; and φ = 0.0–0.06, respectively. The results showed that both the Reynolds and the Richardson numbers enhanced the mean Nusselt number and minimized the rate of entropy generation. It was also found that when AR. increased, the mean Nusselt number was enhanced, and the rate of entropy generation decreased. The nanoparticles volume fraction was predicted to contribute to increasing both the mean Nusselt number and the rate of entropy generation.
Highlights
Despite its active classification, mixed convection flow is still a useful tool of heat transfer augmentation
Many studies have revealed that the mixed convection flow have different issues based on the geometry of the channel or the duct
Richardson number, aspect ratio, and the nanoparticles volume fraction were the following conclusions: varied, giving the following conclusions: The Nusselt number increased with an increase of the Reynolds number Re, while entropy
Summary
Despite its active classification, mixed convection flow is still a useful tool of heat transfer augmentation. Many studies have revealed that the mixed convection flow have different issues based on the geometry of the channel or the duct. Kasaeipoor et al [8] investigated the mixed convection of a nanofluid in a vented T-shaped cavity in the presence of a uniform magnetic field. In this paper, we present an analysis of entropy generation in a nanofluid in an L-shaped duct with a mixed convective flow. We used this geometry because it is very important and useful in cooling systems of nuclear and chemical reactors, electronic components, etc
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