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In this study, the effect of the nano-coating heating surface was examined to improve boiling heat transfer. A silane coupling agent, which produces self-assembled monolayer (SAM), was used to change the wettability on the heating surface. Since the coated thickness of SAM is very thin, it does not fill the cavity on the heating surface. By means of the nano-coating heating surface, boiling curve...
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, subcooled pool boiling characteristics especially in a microbubble emission boiling (MEB) regime are investigated for binary mixture of water and ethylene-glycol. The effects of the concentration are evaluated at 30 vol%, 50 vol% and 70 vol% under the pressurized conditions of 50 kPag (0.5 atg) and 100 kPag (1.0 atg). Although MEB occurs in all the cases utilizing water as cooling liquid...
This paper evaluates boiling heat transfer performance on a lotus-type of porous copper attached on a heated surface. The experiments are performed under atmospheric and saturated pool conditions. The lotus porous medium has uni-directional pore structure and the average size of the pore hole is 0.4 mm. The porous plate of 1.0 mm or 2.0 mm in thickness is mechanically attached onto the heated surface...
Wettability and evaporation control is a key issue to enhance heat transport performance for heat transport devices such as heat pipes and vapor chambers. In this study, in order to enhance heat transport performance of copper-based heat transport devices, utilization of a high performance copper oxide layer is proposed. This layer has high wettability, which leads to strong evaporation performance...
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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