摘要
运用功率谱分析、自相关分析、相图、关联维数和K熵等非线性分析技术对汽液固三相流动沸腾传热系统中的温度波动信号进行了定性和定量研究.研究表明:此类系统具有非线性混沌特性;定量计算结果表明,系统存在2～3个分维,K熵的变化也具有同样的趋势,且为有限正值;传热特性和非线性特征量之间有一定的关系,即颗粒体积含量越大,非线性特征量越大,传热系数越大.
Chaos analysis of the dynamic behavior of temperature fluctuations in a vapor-liquid-solid three phases flow boiling system was conducted in terms of power spectral density function, autocorrelation function, reconstructed phase space, correlation dimension and Kolmogorov entropy. It was shown that the system was non-linear and chaotic. Two or three non-integer correlation dimensions and positive finite value of the Kolmogorov entropy were found in this system. The relationships between heat transfer characteristic and correlation dimension and that between heat transfer characteristic and Kolmogorov entropy were also discussed. Heat transfer coefficient increased with the increase of correlation dimension and Kolmogorov entropy.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2005年第5期779-785,共7页
CIESC Journal
基金
国家自然科学基金项目 (20106012)~~
关键词
汽液固三相
流动沸腾
非线性
确定性混沌
分维
Boiling liquids
Chaos theory
Entropy
Fractals
Heat transfer
Heat transfer coefficients
