Supercooling degree of ethanol solution under action of porous media

doi:10.11949/j.issn.0438-1157.20160463

Abstract

Abstract:

In order to study the effects of porous media on supercooling degree of ethanol solution, the experimental system of porous media with different porosities and thermal conductivities was built. The effect of ethanol concentration on the supercooling degree was investigated by changing the ethanol concentration. The method of heat transfer enhancement was explored by changing the porosity and thermal conductivity of porous media. The data were processed by statistical method and the experiment at each condition was repeated 32 times. The experimental results showed that the porosity and thermal conductivity of porous media had effects on the supercooling degree of ethanol solution. With decreasing porosity and increasing thermal conductivity, the average supercooling degree decreased, and the stability was improved. High concentration had obvious effect on decreasing the supercooling degree. The higher the concentration, the lower the average value and the maximum value of supercooling degree, while the change of concentration had little effect on the stability of supercooling degree.

Key words: supercooling degree, porous media, ethanol solution, porosity, concentration

摘要：

为了研究多孔介质对乙醇溶液过冷度的影响，实验搭建了不同孔隙率和不同热导率的多孔介质的实验系统，通过改变乙醇溶液浓度探究了浓度对过冷度的影响，通过改变孔隙率和热导率探究强化换热方法。数据的处理采用统计学的方法，每种工况下实验32次。结果表明：多孔介质的孔隙率和热导率对乙醇溶液过冷度有影响；随着孔隙率的减小和热导率的增加，平均过冷度值减小，过冷度稳定性增强；高浓度对减小过冷度作用明显，浓度越高，过冷度平均值和最大值越小，而浓度的变化对稳定性影响较小。

关键词: 过冷度, 多孔介质, 乙醇溶液, 孔隙率, 浓度

CLC Number:

TK02

ZHANG Xuelai, LI Yue, WANG Youli. Supercooling degree of ethanol solution under action of porous media[J]. CIESC Journal, 2016, 67(12): 4976-4982.

章学来, 李跃, 王友利. 均匀多孔介质下乙醇溶液的过冷度[J]. 化工学报, 2016, 67(12): 4976-4982.

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