2012 Fiscal Year Final Research Report

Demonstration of super-cooling technology with nanoparticles--assembled bi-porous structure and its control

Research Project

Project/Area Number	23656158
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Thermal engineering
Research Institution	Tokyo University of Science, Yamaguchi
Principal Investigator	YUKI Kazuzhisa 山口東京理科大学, 工学部, 准教授 (90302182)
Project Period (FY)	2011 – 2012
Keywords	マイクロ / ナノスケール伝熱
Research Abstract	Feasibility of nanoparticles-assembled bi-porous structure on a heating surface is focused on in order to develop a new boiling heat transfer cooling device. This unique porous layer has both a micro/mini-pore structure with high permeability for discharging vapor and nano scale pore structure with a much stronger capillary effect as well as high wettability. It was confirmed that a water droplet intensely boiled and evaporated on a high temperature wall with the nanoparticles bi-porous layer even under Leidenfrost conditions. In addition, the life time of the droplet drastically decreases both in a high temperature and low temperature regimes, which proves that the nanoparticles-assembled bi-porous layer can enhance both heat transfer rate in a nucleate boiling regime and critical heat flux.