高黏体系中最大叶片式搅拌桨直径的CFD优化  

Optimization of maxblend impeller diameter in high viscous fluid by CFD

作　　者：王令闪[1] 苏红军[1] 徐世艾[1] 

机构地区：[1]烟台大学山东省化学工程与过程重点实验室化工制造工程山东省高校重点实验室,山东烟台264005

出　　处：《化学工程》2011年第7期9-12,共4页Chemical Engineering(China)

基　　金：国家863重点资助项目(2006A030203);国家自然科学基金资助项目(20476086;10272093);山东省自然科学基金重点资助项目(Z2007B04)

摘　　要：以黄原胶溶液为研究体系,借助于计算流体力学(CFD)方法研究了采用不同直径的最大叶片式搅拌桨时釜内流体速率分布、死区体积、剪切速率、表观黏度和总体流体状况等参数。研究发现:在保持功率不变的前提下,随着桨径的增大,釜内循环区影响范围变广,全釜平均液相速率逐渐增加,速度分布均匀度有所提高,死区体积明显下降。对于研究的搅拌体系,最大叶片式桨适宜直径为0.276 m。当桨径再继续增大直径时,釜内死区减少不明显,同时搅拌桨的剪切性能恶化。The distribution of velocity,dead-zone volume,shear rates,apparent viscosity and overall flow status with different impeller diameters in tanks were studied by means of computational fluid dynamics（CFD） in order to optimize the diameter of the maxblend impeller in high viscous xanthan gum solutions.The result shows that the circulation zone volume and average velocity in tank are increased,at the same time the uniformity of velocity distribution is improved,which leads to obvious decrease of dead volume in tank as the impeller diameter increases under the condition of constant agitation power.The optimum diameter of maxblend impeller is 0.276 m for the studied system.When the impeller diameter is continued to increase more than 0.276 m,the change of dead volume in tank is inconspicuous,and the shear performance of maxblend impeller evidently deteriorates.

关 键 词：最大叶片式桨 混合 计算流体力学 

分 类 号：TQ051.72[化学工程]