Effect of Various Parameters on Thermal Energy Transfer Performance of Heat Pipe

The thermophysical characteristics of any operating medium are the key parameters for the effectiveness of HPs. An operating medium with good thermal conductivity, poor viscosity, and low surface energy (surface tension) is proven as a good heat transfer medium in heat pipes. Researchers have proved that nanofluids have a higher thermal conductivity in comparison to other operating mediums. In the present paper, the impact of different parameters on heat pipe effectiveness has been reviewed. Literature review shows that type of the working fluid, wick structure, filling ratio, and orientation has influenced performance of the heat pipes. Thus, heat pipe performance does not depend only on thermophysical properties but also on the wick structure, angle of tilt, and filling ratio. The pressure inside the heat pipe is also a key parameter for the evaporation of the working fluid. The quantity of vapor formation depends on the inside pressure also so it affects the effectiveness