Solar evaporation of liquid marbles with composite nanowire arrays
•The synergistic effect between Fe3O4 nanoparticles and CNTs optimizes the light-harvesting capability.•Nanowire arrays extend the light path to promote light absorption.•The composite structure enhances the electromagnetic field.•The confine spaces among nanowire arrays improves heat concentration....
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Veröffentlicht in: | International journal of heat and mass transfer 2025-01, Vol.236, p.126275, Article 126275 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | •The synergistic effect between Fe3O4 nanoparticles and CNTs optimizes the light-harvesting capability.•Nanowire arrays extend the light path to promote light absorption.•The composite structure enhances the electromagnetic field.•The confine spaces among nanowire arrays improves heat concentration.•Liquid marbles with Fe3O4/CNT nanowire arrays exhibit high evaporation rate.
Solar interfacial evaporation is a sustainable technology to produce fresh water. The synergistic realization of broadband light absorption and good thermal insulation is crucial to improving the thermal efficiency. Here, we propose a new structure over the surface of liquid marbles, which via nanowire arrays assembled with composite nanomaterials (Fe3O4/CNT nanoparticles) to enhance the evaporation efficiency. The composite materials can effectively absorb light across the entire solar spectrum. Multiple reflections of light over nanowire array further improve light absorption. The narrow spaces and local particle aggregation of the nanowire array enhance thermal insulation to improve the evaporation efficiency. A series of experiments were conducted to verify the concept. The results showed that liquid marbles with upward Fe3O4/CNT nanowire arrays (Fe3O4/CNT-ULM) enhance the light harvesting ability and thermal insulation. Fe3O4/CNT-ULM at a volume ratio 1:2 provides the highest evaporation rate of 12.25 μg/s, which is about 1.16 and 1.53 times higher than that of Fe3O4 and CNT, respectively. Numerical analysis further illustrates that the combination of composite materials and nanowire arrays enhances concentration of electromagnetic field and heat at the air/water interfaces. This promotes rapid evaporation at the thermal boundary region, which has important implications for the structure design of solar interfacial evaporator.
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ISSN: | 0017-9310 |
DOI: | 10.1016/j.ijheatmasstransfer.2024.126275 |