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題名 | Non-Uniformity and Mixing Intensity within the Gassed Stirred Vessels=通氣攪拌槽中之不均勻度與混合強度 |
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作者 | 呂維明; Lu, Wei-ming; |
期刊 | 國立臺灣大學工程學刊 |
出版日期 | 20010200 |
卷期 | 81 2001.02[民90.02] |
頁次 | 頁77-85 |
分類號 | 460.023 |
語文 | eng |
關鍵詞 | 混合強度; 均勻度; 混合強度指數; 攪拌槽; Mixing intensity; Uniformity; Mixing intensity index; Stirred vessel; |
中文摘要 | 本文經由局部混合指數IL來探討通氣效應對氣液攪拌槽中液相的混合強度的影響。由研究結果發現不論單段或多段攪拌系統最強的混合強均出現在攪拌翼翼吐出區靠近槽壁之處。比較不同切線平面的局部混合指數等位線分佈圖,發現檔板與多段攪拌翼的配置均有助於去除IL之最大值局部化現象。針對PPR系統而言,由於中上段pitched blade型攪拌翼提供下段Rushton攪伴翼一軸向往下之加強流,因而在同功率消耗的基準下,較RRR系統有較均勻的IL分佈且整體平均混合強度Iw亦較高。在低通氣量對,IL分佈變得較為均勻,然由於通氣使得攪拌翼液泵量變小導致Iw較小;然而當攪拌翼接近犯濫時,由於上升的氣體帶動槽內液體流動導致平均混合強反而變大。 |
英文摘要 | Effect of aeration on the local mixing intensity of liquid phase within the stirred vessel was examined in detail through a local mixing capacity index, IL. From the results obtained in this study, it is found that no matter for the single or multiple impeller systems, the strongest mixing intensities always appear in the discharge streams of each impeller close to tank wall. Comparing the contour plots of local mixing capacity index IL in different azimuthal planes for various systems, it can be seen that the baffle plate as well as the multiple impeller configuration will suppress the local maximum values of IL appearing in the discharge stream of each impeller. For the PPR system, since the two upper pitched blade impellers provide an enforced axial flow to the lower Rushton turbine impeller, it results in a more uniform distribution IL of a higher mixing intensity than the triple Rushton turbine impeller system with a given energy dissipation density. Under a lower aeration rate condition, the distribution of local mixing capacity IL becomes more homogeneous, while the absolute values of IL were smaller comparing to those for the ungassed condition due to the retarded effect of aeration on the liquid pumping rate of the impeller. However, as the aeration rate is large enough to make the impeller flooded, the uprising gas induces a stronger circulating flow around the whole vessel and almost contrary results were obtained, i.e., a higher mean mixing intensity was produced comparing to the ungassed condition. |
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