  The main objective of the present study is to investigate the effect of
adding nanoparticles at different concentrations and sizes to boiling distilled
water on the nucleate pool boiling heat transfer performance. The major studied
parameters are the effects of wall heat flux, type of nanoparticles, particle
size, and its concentration in aqueous solutions. The tested nanoparticles are
silica (SiO2) and alumina (Al2O3) nanoparticles at 0.001, 0.002, 0.003, 0.005,
and 0.01 vol% concentrations, and particle sizes of 10, 20, and 50nm. A pool
boiling test rig is designed and constructed to conduct heat transfer
experiments with Arudino Control System and eight Type-K thermocouples for
temperature measurements. The experimental investigations showed that adding
definite amounts of nanoparticles to the water at a particular concentration
and size improves its physical and thermal properties and consequently improves
the heat transfer coefficient in percentages reaching 70% for SiO2. For Al2O3,
it showed noticeable lower values compared to Al2O3; however, equal to
distilled water. Furthermore, the surfactants showed slightly better HTC values
than distilled water which diminishes at high heat flux values.
