In this study, the effects of Non-Condensable Gas (NCG) on the Oscillating Heat Pipe (OHP) were investigated. The OHP was made of copper capillary tube and the turn number of the OHP was 16. The employed working fluid was ethanol, and argon gas was used as the NCG. Experiments were conducted on 4 different NCG volume conditions. Temperature and inner pressure of OHP was measured over a heat input range from 40W to 180W. The results of this study have suggested that the operating characteristics of OHP were affected by the NCG and the thermal resistance of OHP was increased.
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