• 作者： Yih,Siu-Ming; Liu,Dean-Mo
• 中文摘要： 本研究測量在一有內迴流的三相懸浮式反應器中的氣體體積分率、床孔隙度及液體停留時間分佈。氣泡上昇速度會因固體的存在而上昇,這可能是由於小氣泡之增加連結形成較大氣泡而導致有一個較高之上昇速度,氣體體積分率會隨氣體速度,密度及攪拌速度或內部液體循環速率增加而增加,會隨液體黏度之增加先上昇然後再下降,而隨表面張力之增加先下降然後再上昇。當氣體剛進入床時可觀察到類似三相流體化一般的床收縮現象,在測量液體停留時間時其分佈曲線與van de Vusse首先所提出而經 Gibilaro et al. 修正後之攪拌槽3環路迴流模式所代表之曲線相似,故可假設液體流動狀態為完全混合。
• 英文摘要： Gas holdup, bed porosity and liquid residence time distribution were measured in a three-phase suspended bed reactor with an internal recycle flow. The bubble rise velocity increased in the presence of solid particles probably due to the increased coalescence of small bubbles to form larger bubbles with a higher rise velocity. Gas holdup increased with increasing gas velocity, gas density and stirring speed or internal liquid recirculation rate. It increased initially within a range of liquid viscosities but then decreased with increasing viscosity. On the other hand, it decreased initially with surface tension and then increased with increasing surface tension. Initial bed contraction was observed as the gas was first introduced similar to the case of three-phase fluidization. Measurements of the liquid residence time distribution revealed that the shape of the distribution curve was similar to that represented by a 3-loop recirculation model first proposed by van de Vusse for a stirred tank and subsequently revised by Gibilaro et al.. The liquid flow pattern could therefore be assumed to be perfectly mixed.
• 中文關鍵字： 流體動力學; 懸浮式反應器; 內迴流
• 英文關鍵字： Hydrodynamics; Suspended Bed Reactor; Internal Recycle Flow