Mechanism and Effect of Surface Conditions on Evaporation of Small Droplets for Innovative Rapid Cooling

2014 Fiscal Year Final Research Report

• Project/Area Number: 24246038
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Kyushu University
• Principal Investigator: TAKATA Yasuyuki 九州大学, 工学(系)研究科(研究院), 教授 (70171444)
• Co-Investigator(Kenkyū-buntansha): TAKAHASHI Koji 九州大学, 大学院工学研究院, 教授 (10243924) ; KOHNO Masamichi 九州大学, 大学院工学研究院, 准教授 (50311634)
• Research Collaborator: SEFIANE Khellil エディンバラ大学, 教授 ; KIM Jungho メリーランド大学, 教授
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: スプレー冷却 / 表面粗さ / 濡れ性 / 液滴 / 固液接触 / 赤外計測

Outline of Final Research Achievements

Clear understanding of mechanism and effect of surface condition on droplet evaporation is indispensable for the development of innovative rapid cooling technique. The present study consists of two parts; (1) measurement of temperature and heat flux distributions of liquid-solid interface by means of high-speed infrared camera, and (2) pseudo-spray cooling by means of micro-jet dispenser with stainless samples with different surface treatment and with different impact angles. Observation by high-speed camera revealed that impacting angle of the drop, one of the key parameters, influences the cooling rate. During collision of droplet with hot surface, the drop moves along the surface before taking-off and the relation of moving length with cooling rate was obtained.

Free Research Field

熱工学