Heat transfer enhancement by utilizing Al2O3-Water nanofluid in a coiled agitated vessel
This study aims to investigate the heat transfer process of Al₂O₃ water-nanofluid using an agitated vessel with coils. The experiment was conducted using three volumetric concentrations of nanofluid (0.15, 0.25, and 0.35 vol%). The effects of propeller speeds ranging from 2 to 12 revolutions per sec...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-02-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X24017714 |
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| Summary: | This study aims to investigate the heat transfer process of Al₂O₃ water-nanofluid using an agitated vessel with coils. The experiment was conducted using three volumetric concentrations of nanofluid (0.15, 0.25, and 0.35 vol%). The effects of propeller speeds ranging from 2 to 12 revolutions per second (r.p.s) and temperature from 30 °C to 80 °C were tested with cooling water flow rates (1.4 and 1.8 l/min). The Nusselt number was evaluated in relation to the nanofluid's volumetric concentration, viscosity, Prandtl, and Reynolds number. The results showed a significant increase in the heat transfer coefficient with an improvement of 74.5 % compared to the base water when the nanofluid concentration was increased to 0.35 vol%. This enhancement is attributed to the increased of thermal conductivity of the nanofluid due to the addition of Al₂O₃ nanoparticles. Besides, smaller Al2O₃ nanoparticle sizes ranging from 12.3 to 17.5 nm resulted in improved stability and suspension efficiency. Propeller speed at 12 r.p.s led to an increase in the heat transfer coefficient by 11.8 %. Moreover, when the temperature reached 80 °C and the cooling water flow rate was reduced to 1.4 l/min, the results showed an increase in the heat transfer coefficient by 19.3 % and 9.8 %, respectively. |
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| ISSN: | 2214-157X |