查詢結果分析
相關文獻
- Effect of Turbulent Intensity on Mixing in Aerated Stirred Tanks
- Non-Uniformity and Mixing Intensity within the Gassed Stirred Vessels
- 紊流強度與尺度及矩柱斷面對渦散的影響
- 高強度橫向激擾混合層流統計特性模擬與探討
- 熱擴散紊流場之重整化研究(2)--廣義熱擴散方程式與廣義混合流方程式
- 濕式滌塵器中基本二相噴流之水滴紊流混合過程
- Scalar Mixing from an Initially U-shape Distribution by Fickian Diffusion--A Mapping Closure Approach
- 遠紅外線乾燥開發中濕性重組魷魚肉製品之探討
- Effects of Reynolds Number and Free-Stream Turbulence on Aevodynamic Performance of a Cantilever Wing
- 降雨對薄層流中紊流強度之效應研究
頁籤選單縮合
題名 | Effect of Turbulent Intensity on Mixing in Aerated Stirred Tanks=通氣攪拌槽中紊流強度對混合之影響 |
---|---|
作 者 | 呂維明; 陳宣; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 17:1 1986.01[民75.01] |
頁次 | 頁59-67 |
分類號 | 460.023 |
關鍵詞 | 紊流; 強度; 混合; 通氣; 攪拌槽; |
語文 | 英文(English) |
中文摘要 | 為了研究攪拌槽中通氣對其紊流混合現象以及攪拌強度對氣液反應系之影響,本研究觀察了通氣攪拌槽中之混合特性,並以熱膜測速儀測量槽中之液體流態及紊流動速度隨操作條件之變化情形。由紊流理論及實驗求得能代表系統攪拌混合強度之平均紊流波動速度與操作變數具有下式關係: 〈u'〉=K₁□ 同時由實驗結果證實,氣液攪拌槽混合特性觀察所發現在低通氣率高攪拌轉速下之高度氣泡分散性及在低攪拌轉速高通氣率下之低度氣泡分散性二種混合情況下,能代表攪拌效率之K₁值高低相差達10倍。因此,平均紊流波動速度可用來判斷通氣攪拌系之操作情況適當與否。 實驗結果亦顯示,在受攪拌影響之氣液反應系中,紊流波動速度為主要影響因素;在亞酸攪拌之催化及非催化氧化反應系,在氣泡高度分散範圍,純反應速率均可以與〈u'〉得良好相關,其值分別與〈u'〉之1.25及1.70次方成正比。 |
英文摘要 | Velocity distributions, mean and fluctuating velocities of water in aerated, fully beffled, six flat blades, disk-type turbine agitated cylindrical tanks were measured with constant temperature hot-film anemometer. Both theoretical analysis and experimental results showed that volume average fluctuating velocity can be expressed as 〈u'〉=K₁□ The Magnitude of K₁for well dispersion is 40 times as large as that for poor dispersion. Experimental evidence suggested the use of 〈u'〉 as quantitative description for the state of dispersion. The effect of fluctuating velocity on gas-liquid reactions was also investigated with catalyzed and noncatalyzed oxidation reaction of sodium sulfite. Experimental results show that in the range of well dispersion of air within the tank, the initial rates of the reaction are proportional to 〈u'〉^1.25 and to 〈u'〉^1.70 , respectively. These results also support the use of 〈u'〉 as a scale up basis, suggested by the previous investigations□, for nonaerated as well as aerated agitated tanks. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。