Surface tension is one of the important factors that influences the behaviors of the working fluid bubbles

such as generation

pulsation split and merge. Furthermore

the heat transfer performance of pulsating heat pipe (PHP) is affected. Three concentration solutions 0.001%

0.005% and 0.009% were configured using sodium dodecyl benzene sulfonate (SDBS) as solute and deionized water as base fluid. The surface tension of water was decreased by 42.2% after addition of 0.005% SDBS

while little change of the specific heat

density and viscosity. Both the start-up and heat transfer performance of PHP were test with the concentration solutions under different heating power input. The experimental results indicated that SDBS can reduce the start-up time of the pulsating heat pipe. Start-up time of 0.001% solution was the shortest with the heating power input no more than 90 W. Differently

the addition of SDBS has little effect on the start-up time under high heating power input. At steady working station

the heat transfer performance of PHP was improved by adding SDBS.