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Subcooled pool boiling heat transfer is evaluated for Long Life Coolant (LLC) that is a binary mixture of water and ethylene-glycol (EG). The experiments are conducted at the concentration of 30 vol.% solution of EG in water and 30 vol% solution of LLC in water under the atmospheric pressure. The liquid subcooling is 50 K. Although the boiling curve for the EG solution shows the same tendency as that...
Aiming for the improvement of the boiling heat transfer coefficient, the effect of the nano-coated heating surface was investigated. We used a silane coupling agent to change the wettability of the heating surface. By means of the coated heating surface, we examined boiling curve of subcooled pool boiling. As a result, the boiling curve with the coating agent was drastically changed and microbubble...
A demand for the high performance cooling technology with low operating power exists for the thermal management of the next generation power electronics, such as the IC inverter of electric vehicle. Boiling heat transfer is a promising candidate for the cooling technology because it can remove a large amount of heat from a heat generating device by phase change of the liquid. However, it is well known...
In this study, feasibility of nanoparticles-assembled bi-porous structure on a heating surface is focused on in order to develop a new cooling device of on-vehicle inverters. In order to coat nanoparticles as a porous layer, boiling adhesion method (BAM) is originally introduced, in which water or water-ethanol solution with mono-dispersed nanoparticles is dropped or sprayed onto a high temperature...
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