Performance Evaluation of Circular Heat Pipe using (CuO+BN)/H₂O Hybrid Nanofluid

An experimentation was carried out to study thermal performance of the heat pipe under different operating conditions. The heat pipe charged with base as distilled water and CuO+ BN hybrid nanoparticles of 40 nm and 70 nm in diameter. The effects of power inputs, heat pipe tilt angle and nanoparticles concentration on the thermal resistance of the heat pipe were investigated. The nanoparticles have a significant effect on the enhancement of thermal performance of heat pipe. Experimental results emphasized that the CuO+BN/H₂O hybrid nanofluids significantly improved the thermal performance of the heat pipe with a volume concentration of 2% for maximal heat transfer enhancement. Compared with distilled water, it is observed that there is a overall decrease of 32% in thermal resistanceat different heat inputs, inclination angle and concentration than that with the based working fluid at 40% filling ratio.