Effect of CTAB on heat transfer and the optimal concentration in pulsating heat pipes
Heat transfer performance of pulsating heat pipe(PHP)could be affected by adding surfactant,and its mechanism was complicated.In this study,the effects of cetyltrimethyl ammonium bromide(CTAB)solution and heating power on the heat transfer performance of PHP were investigated experimentally.The liquid filling rate of 50%was fixed,and the mass fraction of 0-0.288%(0-8.0CMC)and heating power range of 10-105W were adjusted,respectively.The results showed that when heating power ranged from 20W to 90W and concentration ranged from 0.5CMC to 8.0CMC,the addition of CTAB could improve the heat transfer performance of PHP,which was reflected in the decrease of amplitude and increase of frequency of evaporation and condensation temperature fluctuation,and the decrease of thermal resistance of PHP.Among them,the strengthening rate of 4.0CMC was higher up to 11.0%—37.3%.At higher heating power,the strengthening effect of CTAB on heat transfer weakened or even deteriorated,such as the"drying"trend in PHP at 105W and 8.0CMC.For CTAB solution,the optimal concentration was about 4.0CMC,which was much higher than the critical micelle concentration(CMC).For these results,we should not only analyze the influence of static surface tension and viscosity,but also introduce the influence of dynamic surface tension.
surfactantpulsating heat pipeconcentrationheat transfer performancesurface tensionviscosity
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