Numerical Investigation of Nanofluid-based Flow Behavior and Convective Heat Transfer using Helical Screw
DOI:
https://doi.org/10.37934/arnht.27.1.85106Keywords:
Nanofluid, Flow Behavior, Convective heat transfer, Helical Screw, Tortional turbulatorAbstract
Numerous industrial and home users have made use of heat transfer devices for the purpose of heat conversion and recovery. For the past half-century, engineers have worked tirelessly to perfect a heat exchanger design that cuts down on power use without sacrificing performance. Most methods of improving heat transfer work by either increasing the effective heat transfer surface area or creating turbulence, which results in lower thermal resistance. In this study, CFD was used to simulate Al2O3 and CuO nanoparticles in the adsorber tube of a parabolic solar collector with N=1 and N=2 turbulators at Re=20000, 60000, and 100000, respectively, and a turbulence strength of 5%. The turbulence strength was calculated as 5% of the total energy of the particles. Heat conduction is improved by the presence of nanoparticles in the base fluid. Therefore, nanofluids are candidates for alternative methods of heat transfer. Torsional turbulator models with N=2 have a greater output temp than those with N=1 because N=2 models have a higher practical heat level. The intake temp is raised from 35 to 46 degrees Celsius thanks to the presence of CuO nanoparticles in the two turbulator adsorber tubes that are close to one another. The Reynolds number invariably makes the Nusselt number higher. In addition, the Nusselt number demonstrates that there are a greater number of CuO nanoparticle models than Al2O3 nanoparticle models. In addition, CuO nanoparticles are more effective than Al2O3 at lowering pressure. When compared to the N=2 dual-turbulator mode, the N=1 single-turbulator mode has 34% more conflict. PECs are greater for models with two turbulators. Over a wide range of Reynolds numbers, the thermal PEC for N=2 models were 12 percentage points higher than that of N=1 models. CuO nanofluid receivers are superior to Al2O3 ones in their ability to convert solar energy into thermal energy. The two-turbulator model with a Reynolds number of 100,000 that uses CuO nanoparticles achieves the maximum thermal efficiency.
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