【摘要】：冰漿具有良好的流動性和熱傳輸特性,是一種良好的載冷和蓄冷介質(zhì),在空調(diào)制冷、食品冷藏等行業(yè)中具有廣泛的應用前景。蓄冰槽中螺旋槳的機械攪動直接影響冰漿存儲特性,而冰漿存儲特性對其流動性和熱傳輸性有著重要影響。因此,本文將對蓄冰槽中冰漿存儲過程進行模擬,研究螺旋槳對于冰漿存儲期間冰晶動力學演化的影響。本文在國家自然科學基金(項目編號：51376198)的大力支持下展開了以下幾方面的研究。 首先,對冰漿存儲過程中的冰漿特性進行分析,得出冰漿存儲的數(shù)學模型是多相流模型和PBM模型,冰晶與載流溶液之間的相互作用力主要有重力、升力、拖拽力和Safinan力。 其次,分析冰晶動力學事件核模型,冰晶的生長和成核已經(jīng)有比較精確的核模型,而冰晶的破碎與聚集仍缺少合適的核模型�；谏鲜龊四Ｐ蛯Ρ鶟{存儲過程中冰晶粒徑演化過程進行模擬,將平均粒徑模擬值和實驗值進行分析對比,對冰晶動力學事件核模型參數(shù)進行修正,修正后的核模型在模擬冰晶動力學演過過程更有效。 最后,基于修正的冰晶動力學事件核模型對蓄冰槽內(nèi)冰漿的存儲過程進行模擬。結(jié)果表明：槳葉尺寸對冰晶流動、冰晶體積分數(shù)分布、冰晶粒徑的數(shù)量密度、冰晶平均粒徑都有影響；槳葉間距只對于冰晶體積分數(shù)分布有影響；雙螺旋槳能夠使蓄冰槽內(nèi)冰晶分布更加均勻,更能抑制冰晶生長。
[Abstract]:Ice slurry has good fluidity and heat transfer characteristics and is a good carrier and cold storage medium. It has a wide application prospect in air conditioning refrigeration food refrigeration and other industries. The mechanical agitation of propeller in ice storage tank directly affects the storage characteristics of ice slurry, and the storage characteristics of ice slurry have an important influence on its fluidity and heat transfer. Therefore, in this paper, the ice slurry storage process in the ice storage tank will be simulated to study the effect of propeller on the ice crystal dynamics evolution during ice slurry storage. Supported by the National Natural Science Foundation of China (Project No. 51376198), this paper has carried out the following research. Firstly, the characteristics of ice slurry in ice slurry storage process are analyzed. The mathematical models of ice slurry storage are multiphase flow model and PBM model. The interaction forces between ice crystal and current carrying solution are mainly gravity, lift, towing force and Safinan force. Secondly, the kinetic event nucleation model of ice crystals is analyzed. The growth and nucleation of ice crystals have been more accurate, while the fragmentation and aggregation of ice crystals are still lack of suitable nuclear model. Based on the above kernel model, the evolution process of ice grain size in ice slurry storage process is simulated. The mean particle size simulation value is compared with the experimental value, and the parameters of the ice crystal kinetic event kernel model are modified. The modified nuclear model is more effective in simulating the ice crystal dynamics. Finally, based on the modified ice crystal dynamic event kernel model, the storage process of ice slurry in ice storage tank is simulated. The results show that the blade size has influence on ice crystal flow, ice crystal volume fraction distribution, the number density of ice crystal particle size and the average ice crystal particle size, and blade spacing has only effect on ice crystal volume fraction distribution. The double propeller can make the ice crystal distribution more uniform and restrain the ice crystal growth in the ice storage tank.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB611

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