article · International Journal of Thermal Sciences
Improving heat transfer is critical for raising the efficiency of solar thermal collectors. An experimental investigation evaluates the thermal performance of a simulated solar thermal collector cooled by pulsating jet impingement using an aluminium oxide and multi-walled carbon nanotube water-based hybrid nanofluid. The tests examined variations in pulsation frequency, amplitude, waveform, wave offset, and nanoparticle volume fraction. Most parameters significantly affected heat transfer performance, whereas the choice of waveform showed no notable influence. Compared to de-ionised water under continuous flow, the hybrid nanofluid at a 0.3 percent volume concentration achieved a 24 percent peak increase in heat transfer. Specific pulsating conditions using a sine wave, a frequency of 0.2 Hertz, an amplitude of 8 peak volts, and an offset of 2 yielded a 20 percent enhancement. Overall, pulsating jet impingement delivers faster cooling rates than continuous flows.
Solar thermal systems rely on rapid, effective heat removal to operate at higher efficiencies. Demonstrating that pulsating hybrid nanofluids boost heat transfer rates by up to 24 percent provides a practical method to improve thermal management. These insights help engineers design more compact, high-performing solar collectors, potentially reducing equipment size and material requirements while delivering better energy capture.
This technique applies to solar thermal collector manufacturing and advanced fluid cooling systems. The target users are thermal engineers and renewable energy hardware developers. As the research was conducted on an experimental simulated collector, the technology is at an early, laboratory-tested stage. Substantial engineering development, durability testing, and full-scale field verification are still needed before it can be integrated into commercial thermal systems.
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Unlocking optimum heat transfer is essential for enhancing solar thermal collector efficiency and advancing sustainable energy solutions. This experimental study investigates a simulated solar thermal collector's heat transfer behavior using jet impingement cooling, emphasizing hydrodynamic effects in pulsating nanofluid-jet impingement. Al2O3-MWCNT/water hybrid nanofluid is utilized, varying pulsating frequency (0.2 Hz ≤ F ≤ 20 Hz), amplitude (4 Vp ≤ A ≤ 20 Vp), waveform (sine, squared, triangular), wave offset (0 ≤ Ⴋ ≤ 4), and nanofluid volume fraction (0.05 vol% ≤ φ ≤ 0.3 vol%) to optimize heat transfer. Results show a significant influence on heat transfer performance for all parameters except waveform. A peak heat transfer enhancement of 24 % is observed for 0.3 vol% Al2O3-MWCNT/water compared to de-ionized water under continuous jet impingement. Additionally, a 20 % enhancement is achieved with a sine waveform at φ = 0.3 vol%, F = 0.2, A = 8, and Ⴋ = 2. Pulsating jet impingement generally yields higher cooling rates, as the cooling curves indicate. These findings provide crucial insights for optimizing heat transfer in solar thermal collectors through pulsating hybrid nanofluid jet impingement cooling.
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DOI: 10.1016/j.ijthermalsci.2023.108874
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