| Stirred reactor is a common unit operation equipment in processindustry, researching new type agitator with high efficiency and energysaving has important significance. Aiming at the common liquid-liquidphase stirred tank, based on advanced flow field test and CFD numericalsimulation technology, contrary to turbine stirring characteristics and newjet-type impeller agitator structure optimization, this paper did numericalsimulation and experimental research.Six straight blade integral open (PK),45°six helical blade integral open(XK) and Straight blade disk (PY) three commonly used turbine agitatorshad been done flow field numerical simulation and contrast mixingexperiment. CFD numerical simulation reflected the agitators’ structure byobtaining the velocity distribution. Using the report function of fluentsoftware output simulative torque value. Converted into the power curve andthe measured power curves are in good agreementStirring and mixing experimental system be developed and improved bycombining with PIV flow field testing technique. Contrasting PIV measuredflow field with CFD simulation flow field discussed the general approach ofmixing equipment CFD numerical simulation based on the Fluent mixing.When dealing with similar stirred tank, the shaft, agitator and surroundingarea are set to be moving area by model simplified, based on tetrahedralmesh of the model grid. The standard k-ε turbulence model of numericalsimulation method and use moving reference frame (MRF) to solvingsteady-state mixing flow field are more reasonable.It had done numerical simulation research on jet-type impeller agitator under the conditions of specific stirred tank, which accorded to the specificsize pitched blade paddle agitator considering open porosity, hole numberand size. Comprehensive comparison the stirring power flow and maximumspeed which are two major parameters came to the conclusion that: the4-hole,8mm pore size jet-type pitched blade paddle impeller is the optimalagitator. |
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