Heat Transfer Mechanism of a Boiling Bubble on Hydrophobic Surface under Subcooling

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630068
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• 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)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 沸騰 / 濡れ性 / 撥水 / 気泡 / 溶存空気 / 沸騰開始

Outline of Final Research Achievements

The present research studies the mechanism of periodic bubble nucleation and departure from hydrophobic surface under subcooled condition. We focus on dissolved air into boiling liquid as the governing factor. We performed two types of experiments. One is with dissolved air (Open condition) and the other is without air (Closed condition). The results are summarized as follows; There was no bubble generation in closed codition, and it was found that the bubble consists of a mixture of water vapor and air. The dissolved air enhances boiling heat transfer right after onset of boiling.

Free Research Field

熱工学