A microscopic experimental study of nanoparticle motion for the enhancement of oxygen absorption in nanofluids
| Autor: | Jia-Zong Jiang, Lei Liu, Song Zhang, Bao-Min Sun |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Technology
Materials science Physical and theoretical chemistry QD450-801 Energy Engineering and Power Technology Medicine (miscellaneous) Nanoparticle 02 engineering and technology TP1-1185 nanoparticle motion Biomaterials Nanofluid 020401 chemical engineering image analysis Mass transfer mass transfer tirf microscope 0204 chemical engineering Process Chemistry and Technology Chemical technology 021001 nanoscience & nanotechnology Surfaces Coatings and Films Chemical physics Oxygen absorption 0210 nano-technology Biotechnology |
| Zdroj: | Nanotechnology Reviews, Vol 7, Iss 6, Pp 529-539 (2018) |
| ISSN: | 2191-9097 2191-9089 |
| Popis: | The behavior of nanoparticle motion has a great influence on gas-liquid mass transfer. However, it has been very difficult to characterize the motion of nanoparticles from a micro view in mass transfer experiments. In this study, a novel method was proposed to investigate nanoparticle Brownian motion through the application of the total internal reflection fluorescence microscope in a self-designed sample (a quasi-static liquid micro-groove) and the mass transfer enhancement of nanoparticles. Nanoparticle movement behavior was photographed using an electron-multiplying charge coupled device, and 100 consecutive images were recorded using Micro-Manager software at a rate of 20 fps. The images were processed through the particle tracking velocimetry algorithm to calculate two-dimensional motion rates of nanoparticles caused by Brownian movement. It showed that nanoparticle loadings influenced the motion rates significantly, and the motion rates were larger with smaller particle sizes under the same operating condition. The mass transfer coefficients in the quasi-static gas-liquid mass transfer system were calculated and analyzed through microscopic measurement. Based on the above thought, three important non-dimensional numbers [Sherwood (Shp ), Reynolds (Rep ), and Schmidt (Scp ) numbers] for mass transfer theory were studied. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|