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搅拌反应器是化工、医药、食品工业中广泛应用的基础设备之一,当搅拌釜内液深与搅拌釜直径相比较大时(通常比值大于1),往往采用双层或多层桨,以保证顶部到底部的循环流动。 透平桨产生的是径向流,形成以桨叶为中心线的上、下2个循环区,桨叶附近剪切速率高,气体分散能力强。翼型桨产生的流型是轴向流,形成全釜循环,混合均匀,剪切温和。为充分利用两者优势,加强全釜混合,剪切适度,特别是在粘稠物系中,可采用组合桨。目前尚未看到对翼型-透平组合桨流动状况的研究,而对于非牛顿流体中的组合桨流动状况则了解
Stirred reactors are one of the basic equipment widely used in chemical, pharmaceutical and food industries. When the depth of the stirred tank is larger than the diameter of the stirred tank (usually, the ratio is greater than 1), the double- Ensure top to bottom circulation. Turbine propeller is the radial flow, the formation of the blade as the centerline of the upper and lower circulation area 2, near the blade shear rate is high, the gas dispersion ability. The airfoil generated by the airfoil is an axial flow, forming a complete autocycle cycle, mixing well and mildly shearing. In order to take full advantage of the advantages of both, to enhance the mixing of the whole kettle, cut moderate, especially in the viscous system, can be combined paddle. At present, no research has been done on the flow pattern of airfoil-turbine combination paddles, but the flow conditions of combined paddles in non-Newtonian fluids are known