Using phase field model to investigate the change of liquid growth rate in different shapes of structures
| Autor: | Shao-Lun Hsu, 許劭綸 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 In recent years, due to sudden changes in climate and extreme weather, Taiwan’s rainfall has been declining year by year. Exploring more usable water resources is an urgent matter. In addition, Taiwan is surrounded by the sea; therefore, the high water vapor content in the air creates a humid environment. If water can be produced from vapor in the air, it will provide more water resources to use. From nature, how plants and animals effectively produce water in dry areas can be our learning target. Previous studies have found that without adding external energy or intervention, the condensation of droplets can be enhanced through the curvature and structural changes of surface structures. This is a green energy that we trying to achieve, which is not only energy-saving but clean. This study refers to previous experiments and uses Computational Fluid Dynamics (CFD) simulations to investigate the effects of structural shapes and contact angles on the pace of creating condensed droplets. In addition to effectively produce droplets, applicable to thermal controlling and water-harvesting technologies is also critical. We establish a two-dimensional model flow field and analyze it by using phase-field method. In the model, we make flow field in a condition of random distribution of gas-liquid, and at the same time keep the bottom surface at a low temperature. Therefore, phase-field conversion was started; the gas near the bottom surface condensed into liquid. We observe the size of the droplet and compare with the experimental results. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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