Measurement of latent heat of vaporization of nanofluids using calorimetric technique

In this study, the nanofluids are prepared from metal oxide nanoparticles such as Al₂O₃ (13 and 50 nm), SiO₂ (5 ~ 15 and 10 ~ 20 nm), and TiO₂ (21 nm) dispersed in distilled water (DW) at different volume fractions (0.05, 0.1, 0.15, 0.2, and 0.25 Vol.%). A differential scanning calorimeter was used to measure the latent heat of vaporization (LHV) of prepared nanofluids. The effect of change in volume fractions, types, and sizes of nanoparticles was investigated in this study. The outcomes of the study found that LHV of nanofluids decreases with the increase in volume fractions. The highest 21.96 % reduction in LHV was observed in SiO₂ (5 ~ 15 nm)-DW nanofluids, whereas TiO₂-DW nanofluids showed the lowest percentage about 12.38 % at 0.25 Vol.%. Similarly, LHV of Al₂O₃ (13 and 50 nm)-DW nanofluids and SiO₂ (10 ~ 20 nm)-DW nanofluids found to be decreased up to 16.73, 13.31, and 19.84 %, respectively. Moreover, the results of the study indicate that LHV of nanofluids increases with increasing the size of that nanoparticle.