Study of Effects of Surface Characteristics on Bubble Dynamics and Related Boiling Surface Optimization

2015 Fiscal Year Final Research Report

• Project/Area Number: 26889044
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Thermal engineering
• Research Institution: Kyushu University
• Principal Investigator: SHEN BIAO 九州大学, カーボンニュートラル・エネルギー国際研究所, 学術研究員 (80730811)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Keywords: プール沸騰 / 親水撥水複合 / 沸騰開始 / 減圧下沸騰 / 数値シミュレーション / 拡散界面法

Outline of Final Research Achievements

We have designed and fabricated a heterogeneous boiling surface with spatially varying wettability, which exhibits exceptional heat transfer performance. At atmospheric pressure, the onset of nucleate boiling is lowered significantly (to negative levels) on the enhanced surface. The facilitated boiling incipience extends boiling to low-heat-flux applications as an effective means of heat transfer. At reduced pressures, the technical limitation of large incipience temperature overshoots is greatly mitigated by using heterogeneous surfaces with mixed wettability.
Furthermore, we have performed a numerical study of phase transition of a two-component system by using a diffuse-interface method. The results show contrasting bubble behaviors with increasing concentrations of dissolved gas.

Free Research Field

熱工学