This numerical study is performed to investigate heat transfer performance and effect of nanofluids on U-shaped oscillating heat pipes. Pure water is employed as the base fluid while Al2O3 with two different particle sizes i.e., 47nm and 38.4 nm is used as nanoparticle. The results show that nanofluid has significant effect on heat transfer enhancement of the system and with increasing volume fraction and decreasing particles diameter the enhancement intensifies.

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