Abstract
Influence of Al2O3 nanoparticles on nucleate pool boiling heat transfer of diluted binary water-glycerol mixtures has been experimentally measured up to heat flux 91 kW/m2 at diluted volume fractions of 1% to 5% of glycerol into pure water at volumetric concentrations 0.5%, 1% and 1.5% of Al2O3 nanoparticles. Obtained results indicate that presence of nanoparticles into the mixtures result in increasing the pool boiling heat transfer coefficient values and also result in decreasing the wall superheat temperature of surface. Increased values of heat transfer are increased with increasing the volume fractions of Al2O3 too. Generally, it is concurred that Al2O3 nanoparticles typically enhance the pool boiling heat transfer coefficient of binary water-glycerol mixture in comparison with absence of nanoparticles circumstances, up to 25% at 1.5% Al2O3. Additionally, new simple semi - mathematical model has been proposed for a rough estimating of enhanced values with uncertainty about 8%.
Highlights
Nowadays, boiling heat transfer is widely used in many industrial processes including distillation, power generation cycle, and refrigeration
Most of researchers have been investigating on usage and applications of nanofluids on improving the heat transfer coefficient which has not been generally usable in industrial yet
Vassllo et al [8] investigated the pool boiling heat transfer behavior of silica-water nanofluids on a horizontal Ni-Cr wire under atmospheric pressure
Summary
Nowadays, boiling heat transfer is widely used in many industrial processes including distillation, power generation cycle, and refrigeration. Vassllo et al [8] investigated the pool boiling heat transfer behavior of silica-water nanofluids on a horizontal Ni-Cr wire under atmospheric pressure Their experiments illustrated a 200% CHF increase, no significant heat transfer coefficient enhancement was observed. Coursey and Kim [14] proved that even if the Al2O3 nanoparticle concentration was increased by over two orders of magnitude, no enhancement or degradation of heat transfer was recorded during boiling of ethanol-based nanofluids on glass or gold surface. %) nanofluids on a 300 mm square stainless steel plate They found out that copper nanoparticles caused a decreasing in boiling heat transfer coefficient for water as base liquid. For copper plate with nanofluids concentrations more than 0.0001%, the heat transfer coefficient was found to be less than that of the base fluid at both levels of surface roughness. It is noticeable that TEM images were taken more than three times
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