Enhancement in Turbulent Convective Heat Transfer Using Silver Nanofluids: Impact of Citrate, Lipoic Acid, and Silica Coatings

ChemEngineering, Год журнала: 2024, Номер 8(4), С. 65 - 65

Опубликована: Июнь 26, 2024

This study aims to investigate the thermohydraulic performance of silver nanofluids with different surface modifications (citrate, lipoic acid, and silica) in turbulent convective heat transfer applications. Three were prepared, each modified citrate, or silica coatings. The characterized for stability using zeta potential measurements evaluated a smooth brass tube under flow conditions. experimental setup involved measuring temperature, pressure, rate assess coefficients, pressure drops, friction factors. results compared distilled water as base fluid validated against theoretical models. silica-shelled nanofluid (Ag/S) exhibited significant 35% increase average coefficient water, while citrate-coated (Ag/C) acid-coated (Ag/L) showed slight decreases approximately 0.2% 2%, respectively. Ag/S demonstrated 9% mean Nusselt number, indicating enhanced capabilities. However, all experienced higher drops factors than fluid, showing highest viscosity (11.9%). Surface significantly influence nanofluids. shows most substantial enhancement transfer, making it promising candidate applications requiring efficient thermal management. increased hydraulic costs associated higher-pressure must be carefully managed. Further research is needed optimize these specific industrial applications, considering long-term effects nanoparticle concentrations geometries.

Язык: Английский

A detailed thermohydraulic performance assessment of surface-modified silver nanofluids in turbulent convective heat transfer

Journal of Thermal Analysis and Calorimetry, Год журнала: 2024, Номер 149(17), С. 10061 - 10079

Опубликована: Авг. 8, 2024

Abstract This study investigates the thermohydraulic performance of surface-modified silver nanofluids in turbulent convective heat transfer applications. The primary objective is to evaluate impact citrate, lipoic acid, and silica surface modifications on coefficients, pressure drops, friction factors under flow conditions. Silver nanoparticles (50 nm) with specified were synthesized dispersed deionized water, ensuring stable nanofluid preparations. Experimental evaluations conducted a smooth brass tube uniform flux, covering Reynolds numbers from 3400 21,800, mass rates 32 78 g s −1 , inlet temperatures 26 °C, 31 36 °C. Key findings indicate that silica-shelled (Ag/S) exhibited significant 35% increase coefficient compared DI while citrate-coated (Ag/C) acid-coated (Ag/L) showed slight decreases 0.2% 2%, respectively. mean Nusselt number for Ag/S also increased by 9%, demonstrating enhanced capabilities. Surface-modified experienced higher drops than base fluid. Ag/C 7.7% drop, Ag/L 12.3% increase, 12.5% correlating an 11.9% rise viscosity. While nanofluids, particularly silica-shelled, can significantly improve performance, associated increases must be carefully balanced specific Future research should explore long-term stability, varying nanoparticle concentrations, more complex geometries optimize formulations targeted

Язык: Английский