Employing nanofluids is an innovative way to enhance heat transfer in cooling system of internal combustion engine. However, the local flow enhancement due to the adding of nanoparticles, which is one of the key mechanisms behind heat transfer enhancement in nanofluids, still lacks a microscale-level understanding. The aim of this work was to study the microscopic mechanism for local flow enhancement in nanofluids by molecular dynamics (MD) simulation. Local flow characteristics of nanofluids were simulated by MD method and statistically analyzed, and the microscopic mechanism for local flow enhancement was discussed. The MD simulation results revealed that the microscopic mechanism for local flow enhancement in nanofluids is mainly because the irregular movements of nanoparticles, including rotational and translational motions, enhance momentum exchange between fluid molecules and cause disturbance of base fluid. And therefore flow of nanofluids would be more active, which is better for heat transfer. The present work suggests the microscopic mechanism of local flow enhancement in nanofluids, which is the basis of understanding heat transfer enhancement of nanofluids and further application of them in cooling system of internal combustion engine.

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