| Summary: | 碩士 === 國立高雄應用科技大學 === 模具工程系碩士班 === 95 === The application on air-cooled condenser is quiet plenty and common in the business condition. For example, oil-refining industry, petrochemical industry, others chemical industry, and incinerator, etc.... The researches of local heat flow characteristic are also quiet a lot. Most methods that improve hydrothermal effect are to increase the heat transfer area and reduce the pressure drop. In order to deeply analyze the flow field characteristic, the study of experimental text is designed to observe the flow between different vertical and horizontal section of the macrocosm velocity field in the wall. The fixed amount particle image velocimetry (PIV) system without invasive technique is used on the lessened air-cooled condenser (ACC) which used in incinerators under the condition of fixed wind velocity and fixed wall. Then, 3D PIV technique is used to observe the three-dimension flow field between ACC of incinerator and wall. The evidence shows the dissimilarity between two-dimension section and three-dimension section.
The experimental result reveals the status of flow field between ACC and wall. Each vertical section shows that in the bottom off ACC vortexes occur between Z＝0mm and Z＝60mm. In addition, horizontal vortexes appear in horizontal section between Z＝30mm and Z＝50mm, especially in the part of the geometry core of 3-row staggered elliptic finned-tube. Because of the vortexes, airflow gyrates and remains there. The airflow reduce the heat transfer efficiency of ACC. Moreover, in the outlet of airflow, due to the effect of outlet pressure, a high speed section results between ACC and wall. The high speed section hastens the flow of the section out. The effect might be helpful for the efficiency of ACC heat exchange.
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