Turbulent forced convection and entropy analysis of a nanofluid through a 3D 90° elbow using a two-phase approach
Heat Transfer, ISSN: 2688-4542, Vol: 50, Issue: 8, Page: 8173-8203
2021
- 9Citations
- 2Captures
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Article Description
In a scenario characterized by a secondary flow called Dean's vortices, thermal and flow behavior analysis is examined. Forced convection of an AlO–water nanofluid through a three-dimensional (3D) 90° elbow was analyzed numerically using a multiphase mixture model. Turbulence is taken into account by using the shear-stress transport k–ω model. Also, entropy production is presented to obtain the optimized conditions. Simulation parameters consist of different Reynolds numbers (10,000 (Formula presented.) 100,000), nanoparticle volume fraction (Formula presented.), nanoparticle diameter (Formula presented.). The findings reveal that the increase in the (Formula presented.) and the Re along with a smaller d discourages the appearance of Dean vortices in the flow. The pressure drop increases with the increase in the volume fraction and the decrease in the nanoparticles' diameter. The highest Nu is observed at (Formula presented.) for (Formula presented.). Significant heat transfer rates are observed near the outer wall. The minimum total entropy production is obtained at Re = 100,000 for (Formula presented.) and (Formula presented.).
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