Experiments were performed to understand the influence of surface wettability on heat transfer performance of an oscillating heat pipe (OHP)

the alkali assistant surface oxidation technique was used to fabricate the surfaces. The surfaces with different wettability were obtained by control the concentration of the reaction solution of sodium hydroxide and ammonium persulfate. Different OHPs were obtained with the surface contact angles(CA) of 0°、33.9°、55.7°、84.3°

respectively. The effect of different degrees of surface wettability on heat transfer performance of oscillating heat pipe was investigated experimentally. The results show that the oscillating frequency and amplitude of the working fluid in the OHP increases as the CA increases. The thermal resistance and temperature difference of OHP decreases as the CA increases. Therefore

heat transfer performance of the OHP was enhanced as the CA increases.