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頁籤選單縮合
題名 | Gassed Power Drawn by Each Impeller in Multiple Impeller Agitated Vessels=多段通氣攪拌槽中各段攪拌翼之功率消耗 |
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作 者 | 呂維明; 巫鴻章; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 33:6 2002.11[民91.11] |
頁次 | 頁541-553 |
分類號 | 460.023 |
關鍵詞 | 多段通氣; 攪拌槽; 攪拌翼; 功率消耗; CFD simulation; Gas recirculation; Power consumption; Multiple impeller; Stirred vessel; Gas loading; |
語文 | 英文(English) |
中文摘要 | 經由考慮氣體負載之不均勻性及氣體再循環現象,吾人探討不同攪拌翼組合下多段通氣攪拌槽各段攪拌翼之功率消耗。利用Wu and Lu (2002)所提出的數值方法,吾人計算通氣攪拌槽中的局部氣含量值與氣相之流態分佈,並據以估算各段攪拌翼氣體再循環速率。研究結果發現,在多段氣液攪拌槽中,由於氣體負載不均勻,將導致各段攪拌翼的功率消耗不一;除此之外,未考慮氣體再循環現象,將對功率消做出錯誤預估。將(1-□□)□與總通氣量□為基礎的修正通氣數相回歸,提出兩條相關式來預測多段通氣攪拌槽中各段Rushton型攪拌翼之功率消耗如下: 相同的模式,針對斜板式攪拌翼亦提出兩條相關式來預測多段通氣攪拌槽中各pitched-blade型攪拌翼之功率消耗如下: 比較利用本研究所得相關式計算各段攪拌翼之功率消耗,並將結果與Michel and Miller (1962)所提出的式子計算所得之功率消耗相比較,發現兩者所得之結果甚為吻合。利用本研究所得之關係式可準確多段通氣攪拌槽中,各段攪拌亦之功率消耗,對於多段氣液攪拌槽之設計助益甚大。 |
英文摘要 | Power drawn by each impeller in gassed multiple impeller systems with different impeller combinations was examined in detail by considering the effects of non-uniform gas loading and the gas recirculation. By applying the developed numerical method (Wu and Lu, 2002) to the aerated stirred vessel, the local gas holdup distribution and the velocity profile of gas bubbles within the system were calculated and used to acquire the gas recirculation rate around each impeller. From the results obtained in this study, it is found that non-uniform gas loading results in the non-equivalent energy dissipation among the impellers in multiple impeller systems. This will lead to an erroneous result if the effect of gas recirculation is not considered. By relating (1-□/□) □ to the modified aeration number based on the total gassing rate around each impeller, □ the correlation equations for estimating the power drawn by any Rushton turbine impeller in a multiple impeller system can be obtained by For a pitched blade impeller installed in a coaxial shaft in a multiple impeller system, two formulas based on the total gassing rate are also proposed to estimate the power drawn by any pitched blade impeller, i.e., Comparing the calculated power drawn by the Rushton turbine impeller using the formulas obtained in this study with the correlation proposed by Michel and Miller (1962), it is found that they agree quite well. By suing the above correlation equations the power drawn by each impeller in a multiple impeller system with various impeller combinations can be evaluated accurately. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。