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Numerical study has been conducted for the chaotic flow in a multi-turnclosed-loop pulsating heat pipe (PHP). Heat flux and constant temperatureboundary conditions have been applied for heating and cooling sectionsrespectively. Water was used as working fluid. Volume of Fluid (VOF) method hasbeen employed for two-phase flow simulation. Volume fraction results showedformation of perfect vapor and liquid plugs in the fluid flow of PHP.Non-linear time series analysis, power spectrum density, correlation dimensionand autocorrelation function were used to investigate the chaos. Absence ofdominating peaks in the power spectrum density was a signature of chaos in thepulsating heat pipe. It was found that by increasing the filling ratio andevaporator heating power the correlation dimension increases. Decreasing of theautocorrelation function with respect to time showed the prediction ability isfinite as a result of chaotic state. An optimal filling ratio of 60% andminimum thermal resistance of 1.62 K/W were found for better thermalperformance of the pulsating heat pipe.

Analysis of chaotic flow in a 2D multi-turn closed-loop pulsating heat pipe