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| Abstract: |
| This study delves into both experimental and analytical examinations of heat exchange in a straight channel, where Al2O3-water nanofluids are utilized, spanning the Reynolds number spectrum from 100 to 1800. Diverse volume fractions (1%, 2%, and 3%) of Al2O3-water nanofluids are meticulously prepared and analyzed. The essential physical properties of these nanofluids, critical for evaluating their thermal and flow characteristics, have been comprehensively assessed. From a quantitative perspective, numerical simulations are employed to predict the Nusselt number (Nu) and friction factor (f). The empirical findings reveal intriguing trends: the friction factor experiences an upward trend with diminishing velocity, attributed to heightened molecular cohesion. Conversely, the friction factor demonstrates a decline with diminishing volume fractions, a consequence of reduced particle size. Both the nanofluid’s viscosity and heat transfer coefficient exhibit a rise in tandem with augmented volume flow rate and concentration gradient. Notably, the simulation results harmonize remarkably well with experimental data. Rigorous validation against prior studies underscores the robust consistency of these outcomes. In the pursuit of augmenting heat transfer, a volume fraction of 3% emerges as particularly influential, yielding an impressive 53.8% enhancement. Minor increments in the friction factor, while present, prove negligible and can be safely overlooked. |
| Key words: Nusselt number friction factor nanofluids flat plate solar collectors solar energy |
| DOI：10.11916/j.issn.1005-9113.2024001 |
| Clc Number:TK513.1 |
| Fund: |
