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The effect of low-frequency vibrations (LFVs) on the thermal performance of an oscillating heat pipe (OHP) was investigated experimentally. The thermal resistance of the OHP was evaluated under different conditions (e.g., heat rates, filling ratios, and frequencies). Results show that the LFVs added in the OHP have a significant effect on the heat-transfer performance, which is dependent on the applied frequency. The LFVs removed the “dry-out” and improved the thermal performance of the OHP at the lower filling ratio and higher heat transfer rate.