PHENOMENA OF SOLIDIFICATION IN NORMAL FREEZING OF A SIMPLE EUTECTIC-FORMING ORGANIC MELT
PHENOMENA OF SOLIDIFICATION IN NORMAL FREEZING OF A SIMPLE EUTECTIC-FORMING ORGANIC MELT
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简单共晶有机熔体正常冷冻时的凝固现象
DOI：
10.1252/jcej.6.332
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发表时间：
1973
影响因子：
0.8
通讯作者：
K. Satake
中科院分区：
文献类型：
--
作者：
Toyohiko Hayakawa;M. Matsuoka;K. Satake
为了理解区域精炼中的凝固现象，对一个简单的共晶形成有机体系（萘-苯甲酸）进行了正常冷冻。实验结果从凝固速率和固体杂质分布两方面进行了分析。研究表明，为了保持液体和固体传热速率的平衡，必须选择降低速率（等于稳态下的凝固速率）。包合因子，定义为包合液体在界面处的体积分数，已被引入来解释固体中杂质的存在。包合因子的值已从固体中的杂质浓度曲线中得到，并根据液体的降低速率和搅拌速率绘制。结果表明，在降低速率足够小、液体充分搅拌的条件下，分离效果良好。
In an attempt to understand the phenomena of solidification in zone refining, a simple eutectic-forming organic system (naphthalene-benzoic acid) has been subjected to normal freezing. Experimental results have been analyzed in two ways, by the rates of solidification and impurity profiles in the solid. It has been shown that the lowering rate (equal to the rate of solidification at steady state)must be selected so as to maintain a balance between the heat transfer rate in a liquid and that in a solid. An inclusion factor, defined as a volume fraction of the included liquid at an interface, has been introduced to explain the presence of impurity in the solid. Values of the inclusion factor have been obtained from the impurity concentration profiles in the solid and plotted against the lowering rates and the stirring rates of the liquid. The results showed that a good separation was achieved under the conditions of sufficiently small lowering rates and sufficient stirring of the liquid.