Abstract
BackgroundLow-frequent instabilities within flow pattern of stirred tank (ST) which well-known as macroinstability (MI) further as “flow field instability” has significant additional effect to common turbulence concerning effectivity of mixing process. MethodsIn this work, numerical simulation methods were used to study the impact of baffle on flow field instability. Significant FindingsThe results showed that flow field instability in baffled stirred tank (BST) was full of global tank compared with unbaffled stirred tank (Un-BST), and the instability of near baffle zone was stronger than that in near impeller zone. By comparing the power consumption in ST equipped with different structure baffles, find that the punched baffle stirred tank (Pun-BST) and isolated baffle stirred tank (Iso- BST) system have lower power consumption than the traditional baffle stirred tank (Trad-BST) system. Also, the degree of global instability decreased partly. In addition, the instability intensity of near baffle zone in the Pun-BST system was lifted locally, and the maximum increase can be as much as 4 times, compared with Un-BST.
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