Effects Of Propeller Mixer On Ice Crystal Dynamics Evolution Reaearch

Slurry is featured in its flowing and thermal characteristics as well as environmentally friendly and it is a good thermal storage medium. So far, ice slurry has been used in many fields, like the refrigeration, food reserving and medical treatment, and so on. The mechanical agitation of propeller in ice storage tank influence the ice storage characterisetics directly,and it has an important influence on its flow and heat transfer characteristics. Therefore, this article simulate ice storage process in ice storage tank to study the influence of propeller to ice crystal dynamics evolution during the storage.This paper supported by Natural Science Foundation of China (NO.51376198) researches on the following several aspects.First of all,the characteristics of ice slurry in the process of ice slurry storage was analyzed,and concluded the mathematical models was multiphase flow model and PBM.The interactions between ice crystal and solution include gravity,lift,drag force and Safman force.Second, analysing ice crystal dynamics event nuclear model, ice crystal growth and nucleation has accurate nuclear model, and the broken and accumulation of ice crystals is still lack of proper nuclear model. Nuclear model was based on the above the ice crystals in the process of ice slurry storage size, to simulate the evolution process of the average particle size of comparing the simulation value and experiment value and event dynamics of ice crystal nucleus model parameters are modified, the revised nuclear model to simulate ice dynamics in process more effective.Finally, based on the modified ice crystal event nuclear models to simulate the process of ice slurry storage in stoage tank.The results showed that the blade size has an influence on ice crystal flow,volume fraction distributon of ice crystal,number density of ice crystal and averge particle size,the blade position and spacing just has an influence on volume fraction distribution,twin screw can make the distribution of ice crystal more uniform in the storage tank,and can inhibit the growth of ice crystals.