Improvement of Heat Pipe Solar Collector Thermal Efficiency Using Al₂O₃/Water and TiO₂/Water Nanofluids

Table 1

Properties of nanoparticles used in the study [35].

	Alumina	Titanium dioxide
Purity	99.5+	99.55+
Particle size (average)	18 nm	38 nm
Surface area	140 m^2/g	35 m^2/g
Density	3900 kg/m^3	4100 kg/m^3