In this paper, an experimental investigation has been carried out to compare the thermal performances of a copper heat pipe with and without wick. Thermal performance of the heat pipe is affected by many factors such as: Inclination angle (from horizontal axis (φ)), Filling ratio (ratio of volume of working fluid to volume of evaporator section (FR)), Heat Input (Q) , Coolant flow rate and Permeability (K) are presented and discussed. The heat pipe was made from copper with methanol as the heat transfer fluid. Screen mesh 100ss(three layer) used for wick structure to return condensate to evaporator section. The comparison between results of a heat pipe with and without wick (thermosyphon) provided an important quantitative and qualitative understanding of the wick heat pipe performance. Empirical correlations for the heat transfer coefficients were obtained.

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