CAJ | 학술논문

目前，处理高黏流体和对剪切敏感介质的层流搅拌槽的报道并不多见。本文建立了描述双层组合桨搅拌槽内高黏非牛顿流体层流流动、混合过程的数学模型，利用 Laminar 模型、多重参考系法（MRF）和示踪剂浓度法对其流场特性、示踪剂扩散过程进行数值模拟，分析搅拌槽内轴向速度曲线、示踪剂浓度响应曲线和混合时间。结果表明：中心搅拌中间面将介质阻隔在各自的半层内运动，偏心搅拌介质作全局运动，轴向混合能力突出；转轴中心搅拌依靠上下半层浓度差的增大向下扩散，转轴偏心搅拌通过不对称结构扩散示踪剂，叶轮相对转轴偏心搅拌则利用叶片的不对称分布；距离加料点较近和较远的监测点浓度响应曲线因振荡和调整，混合时间较长，处于中间面的监测点拥有最短的混合时间。
목전，처리고점류체화대전절민감개질적층류교반조적보도병불다견。본문건립료묘술쌍층조합장교반조내고점비우돈류체층류류동、혼합과정적수학모형，이용 Laminar 모형、다중삼고계법（MRF）화시종제농도법대기류장특성、시종제확산과정진행수치모의，분석교반조내축향속도곡선、시종제농도향응곡선화혼합시간。결과표명：중심교반중간면장개질조격재각자적반층내운동，편심교반개질작전국운동，축향혼합능력돌출；전축중심교반의고상하반층농도차적증대향하확산，전축편심교반통과불대칭결구확산시종제，협륜상대전축편심교반칙이용협편적불대칭분포；거리가료점교근화교원적감측점농도향응곡선인진탕화조정，혼합시간교장，처우중간면적감측점옹유최단적혼합시간。
The laminar stirred tank processing highly viscous fluid and shear sensitive media is scarcely reported. A mathematical model describing the laminar flow and mixing process of highly viscous non-Newtonian fluid in stirred tank with double combined impeller was established. The laminar model, the multiple reference frame (MRF), and the tracer concentration method were used to simulate the flow field and spreading process of tracer. The axial velocity distribution curves, response curves of tracer concentration and mixing time were analyzed. The working medium was blocked with the middle surface moving in each half layer of centrally stirred tank,and the working medium in eccentrically stirred tank had global movement and prominent axial mixing ability. Tracer in stirred tank with axis rotating centrally continued spreading to the lower layer depending on increasing concentration imbalance,tracer in stirred tank with axis rotating eccentrically relied on the asymmetric structure to spread,and tracer in stirred tank with impeller rotating eccentrically relied on the asymmetric distribution of blade. The monitor points which were near to and far away from the feeding point had long mixing time because of oscillation and adjustment,and the monitor point in the middle had the shortest mixing time.