Temperature oscillation signal of pulsating heat pipes was studied quantitatively and qualitatively by means of analyses of power spectrum,auto-correlation function,correlation dimension,Kolmogorov entropy and rescale...Temperature oscillation signal of pulsating heat pipes was studied quantitatively and qualitatively by means of analyses of power spectrum,auto-correlation function,correlation dimension,Kolmogorov entropy and rescaled range statistical analysis.The results showed that the system had deterministic chaotic characteristics which featured non-integer value of correlation dimension about 2.5—11 and positive Kolmogorov entropy.Most Hurst exponents were between 0.8 and 1,indicating long range correlation.Thermal performance was tied with correlation dimension.Higher correlation dimension indicated lower thermal resistance.展开更多
文摘Temperature oscillation signal of pulsating heat pipes was studied quantitatively and qualitatively by means of analyses of power spectrum,auto-correlation function,correlation dimension,Kolmogorov entropy and rescaled range statistical analysis.The results showed that the system had deterministic chaotic characteristics which featured non-integer value of correlation dimension about 2.5—11 and positive Kolmogorov entropy.Most Hurst exponents were between 0.8 and 1,indicating long range correlation.Thermal performance was tied with correlation dimension.Higher correlation dimension indicated lower thermal resistance.