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題名 | Oscillatory of Air Convection in a Bottom Heated Vibrating Vertical Circular Cylinder=振盪容器內空氣自然對流之實驗研究 |
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作 者 | 柯耀庭; 張東欽; 張裕智; 郭義忠; 林家弘; | 書刊名 | 國立虎尾技術學院學報 |
卷期 | 4 2001.03[民90.03] |
頁次 | 頁137-148 |
分類號 | 440.137 |
關鍵詞 | 熱浮力; 週期性變動; Thermal buoyancy; Medium temperature; |
語文 | 英文(English) |
中文摘要 | 本論文在研究一垂直的直柱圓筒容器,上下溫度改變下的狀態,以實驗來探討熱浮力的擺動情形,溫差變化10℃至20℃,頻率從0至30Hz,振幅由1至3mm,圓筒直徑7.5cm,高度15cm,主要測定圓筒周圍及中心線部份的溫度,在圓筒頻率低於30HZ時,其流場並不因時間愈長而漸趨平衡,當振幅為最小時,其頻率不同也會相對增加圓筒中心之溫度,流場之變化在點位置固定下,無論在任何頻率下,其擺動情形亦隨時間呈週期性變動,結果得知在高頻率及固定之溫差下,將會比靜止狀況下還要平穩,其流場結構在以下會有更進一步探討。 |
英文摘要 | An experimental study was carried out here to investigate the oscillation of the thermal huoyancy and uniforms of section in air enclosed by vibrating vertical right circular cylinder with differentially heated end walls. Cases heated from below are examined for the imposed temperature difference ΔT ranging from 10℃ to 20℃ by vibrating the cylinder frequency n from 0 to 30Hz and amplitude b from 1 to 3mm for a cylinder with diameter D=7.5cm, height H=15cm. Temperature measurements are made along the circumference and selected locations along the center line of the cylinders to detect the oscillations, the transient variations of the medium to explore the effects of vibration rate and from which the oscillatory flow structure are inferred. Based on the results for the time records of the medium temperature are clearly show the flow cannot be stabilized by the cylinder vibration at the vibration frequency n≦30. The results also indicate that at high vibration frequency the temperature of a section can be more uniform than that in a stationary cavity. Moreover, the flow structures are discussed in detail. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。