摘要
通过定义局部分离度,来定量表征喷射器内液-液湍流微观混合规律。其定义式为:(实验所得H^+浓度-模拟所得H^+浓度)/模拟所得H^+浓度。选用酸碱反应体系,利用PLIF技术得到沿喷射器轴线的H^+浓度;采用Fluent软件,利用Standard k-ε模型,模拟获得相同操作条件下的H^+浓度变化趋势。得到不同操作条件下,分离度沿喷射器轴线的变化,结果表明:(1)引流速度不变,喷嘴速度越大,两流体越容易达到微观尺度的均匀混合;(2)喷嘴速度不变,引流速度越大,两流体反而不容易达到微观尺度上的均匀混合;(3)速度比一定的情况下,喷嘴速度越大,越有利于流体的微观混合。
Local separating degree was defined to quantificationally characterise liquid-liquid turbulent micro-mixing in a jet reactor, which was defined as:(the experimental H^+ concentration-the simulative H^+ concentration)/the simulative H^+ concentration. Acid-base reaction was selected to study micro-mixing character. H^+ concentration along the axis of jet reactor was got by the means of PLIF; Using Fluent, H^+ concentration under the same operational conditions was obtained through standard k-ε. The change of separating degree along the axis of jet reactor under different operational conditions was received. The result shows: (1) With constant suction flow speed, the bigger the ejection flow speed is, the easier it is to be uniform at micro-scale. (2) With constant ejection flow speed, the bigger the suction flow speed is, the more hard it is to be uniform at micro-scale. (3) With constant speed ratio, the bigger the ejection flow speed, the easier it is to be uniform at micro-scale.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2012年第3期323-326,共4页
Computers and Applied Chemistry
基金
山东省自然科学青年基金(ZR2009BL015)
中国科学院化学激光重点实验室开方基金(KLCL200901)(2006AA04Z184)
关键词
喷射器
PLIF
微观混合
模拟
jet reactor, PLIF, micro-mixing, fluid mechanics