气泡流纳米流体的太阳能蒸腾特性研究

Study on Solar-driven Evaporation Performance of Bubbly Flow Nanofluids

太阳能驱动水蒸发是光热利用的重要途径,光-热蒸汽转化可通过纳米流体吸收太阳能生成蒸汽。本文提出光散射气泡耦合光吸收纳米颗粒强化光能转换的新思路,在太阳能纳米流体蒸发体系中引入气泡群,这些动态气泡作为光能散射与传递中心,延长了入射光路径并倍增了光通量;同时提供了极大的气液界面完成气泡吸湿,以及破水而出的炸裂扰动加速蒸汽扩散,从而实现高效太阳能蒸发传质,蒸汽生成速率可达0.88 kg·m^(-2)·h^(-1),为纯水蒸发速率的3.1倍。

Plasmonic nanofluids can be used to promote steam generation,showing great promise of such fluids for solar energy conversion and utilization.In this study,we propose a new concept of light scattering bubbles coupled with light absorption nanoparticles to improve solar evaporation.Bubbles are introduced into the normal evaporation system of nanofluids.The dynamic bubbles not only act as light scattering centers to extend the incident light path and amplify the light flux,but also provide large gas-liquid interfaces for moisture capture as well as kinetic energy from bubble bursting to accelerate vapor diffusion,thus enhancing the solar steam generation.The evaporation rate is 0.88 kg·m^(-2)·h^(-1),which is about 3.1 times higher than that of the pure water.