直接接触式沸腾换热过程气泡混合均匀度评价

发布时间：2018-09-13 11:42

【摘要】：针对直接接触式沸腾换热过程中气泡群扰动的多相流体混合性能评价问题,提出一种基于图像处理技术与像素偏差理论量化混合复杂流体流型均匀性的精确检测与度量新方法。通过气泡群RGB图像的灰度矩阵进行偏差计算,精确地定量描绘了直接接触式换热过程中的气-液混合状态,其值大小反映了气泡群的分布状况,而不同工况下混合均匀时间的差异反映了不同多相体系的均匀性差异;对偏差序列进行正态性检验,发现其近似符合正态分布;运用混沌检测方法对序列进行混沌特征分析,发现整个混合过程是混沌的。通过一个简单的指标实现了复杂条件下气泡群的量化和表征,为多相流流型识别提供了新的分析思路并指导换热过程的混沌强化。
[Abstract]:In order to evaluate the mixing performance of multiphase fluid in direct contact boiling heat transfer process, a new method based on image processing technology and pixel deviation theory is proposed to quantify the flow pattern uniformity of mixed complex fluids. By calculating the deviation of the gray matrix of bubble group RGB image, the gas-liquid mixing state in the direct contact heat transfer process is accurately and quantitatively described, and its value reflects the distribution of the bubble group. The difference of mixing time under different working conditions reflects the difference of homogeneity of different multiphase systems; the normality test of deviation sequence shows that it is approximately in accordance with normal distribution; chaos detection method is used to analyze the chaotic characteristics of the sequence. It is found that the whole mixing process is chaotic. The quantization and characterization of bubble groups under complex conditions are realized by a simple index, which provides a new analysis idea for the identification of multiphase flow patterns and guides the chaotic enhancement of heat transfer process.
【作者单位】：昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室;曼彻斯特大学数学学院;科罗拉多大学波德分校机械工程系;
【基金】：国家自然科学基金项目(51666006,51406071) 云南省科技领军人才培养计划项目(2015HA019)~~
【分类号】：O359;TP391.41

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