| Summary: | 碩士 === 崑山科技大學 === 機械工程研究所 === 103 === Rotating flow significantly affects the temperature distribution, mixing of fuel and oxidizer, residence time of the flow, which in turn is expected to greatly affect the hydrocarbon reactants and environments for the formation of carbon nano-structures. Stain rate affects carbon nano-structures synthesis either through the residence time of the flow or carbon sources available for fabrication of carbon nanostructures (such as carbon nanotubes (CNTs) and onions). However, to our knowledge, rotating flow fields have not been applied to control growth of nanostructures in butanol flames prior to this study. Therefore, in this study we aim at exploring the influence of flow rotation on the synthesis of carbon nanomaterials using butanol diffusion flames in a rotating stagnation flow with a liquid pool and a catalytic Ni substrate.
This thesis is aimed at investigating the key factors for flame synthesis of carbon nanomaterials using a stagnation flow composed of a lower liquid pool and an upper rotating burner. In the experiments, the following key factors will be examined on flame synthesis of carbon nanomaterials: (1) carbon sources (O-contained butanol is used as fuel, and (2) hot environment, including residence time (governed by injection velocity and rotating velocity), oxygen concentration in the upper burner, temperature distribution, and sampling position for collecting deposit materials.
The flame appearance, flame structure, flame stability, and soot layer will be experimentally observed using image processing techniques. Meanwhile, the temperature distribution in various axial positions will be measured using an R-type thermocouple. Moreover, we will employ the substrate with Ni catalyst to collect deposit materials. Finally, a scanning electron microscopy (SEM), a transmission electron microscopy (TEM), a high resolution TEM (HR-TEM) and a Raman spectroscopy will be utilized to characterize the morphology and microstructure of carbon deposits and their formation mechanism in the combustion environment.
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