Journal
PROGRESS IN NUCLEAR ENERGY
Volume 133, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pnucene.2020.103614
Keywords
Flow boiling; CFD simulation; Vertical annulus; High aspect ratio; Al2O3-Water nanofluid
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Numerical studies show that the volumetric concentration of Al2O3-water nanofluid has a significant impact on heat transfer performance during low flow rates convection boiling in a vertical annulus, with the optimal volumetric concentration being 0.5% resulting in a 42.1% enhancement in heat transfer coefficient.
Numerical studies on the effects of volumetric concentration of Al2O3-water nanofluid during low flow rates convection boiling in a vertical annulus is carried out. The aspect ratio of the vertical annulus is 352 while the annular gap is 3.5 mm. The Fluent code is developed using the RPI wall boiling model. The Fluent code is verified with the results available in the literature and also with the results on a similar experimental set-up which shows excellent agreement. The results show that for maximum heat transfer the volumetric concentration of nanoparticles should be 0.5%. It is also inferred that to achieve maximum heat transfer there should be an optimum concentration of nanoparticles. The maximum enhancement in heat transfer coefficient is 42.1%.
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