光电催化过程中氧气泡成核—生长—脱离特性研究  

Investigation on Characteristics of Bubble Nucleation,Growth and Detachment During Photochemical Catalysis

作　　者：曹振山 郭烈锦[1] 王晔春[1] 胡晓玮[1,2] 陈娟雯 CAO Zhen-Shan;GUO Lie-Jin;WANG Ye-Chun;HU Xiao-Wei;CHEN Juan-Wen(State Key Laboratory of Multiphase Flow in Power Engineering, Xi ＇an Jiaotong University, Xi＇an 710049, China;College of Mechanical ＆ Electrical Engineering, Shaanxi University of Science ＆ Technology, Xi＇an 710021, China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]陕西科技大学机电工程学院,西安710021

出　　处：《工程热物理学报》2018年第7期1488-1492,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目(No.51236007)

摘　　要：光电催化过程中的气泡动力学特性是研究气液两相流动行为的重要参数,对光电分解水的效率及反应过程中的传热、传质产生重要影响。本文针对TiO_2光电极表面析出氧气泡的动力学特性展开研究,通过独立设计的实验系统,得到了氧气泡整个演化过程的生长规律符合d∝(?)~s,气泡形成10 ms以内x为0.5～0.85,10 ms之后x≈0.33,捕捉到了气泡成核初期的图像,得到了光学手段能观察到的气泡成核时间和空间尺度,给出了激光功率和恒定偏压对气泡脱离直径的影响规律。Bubble dynamics in photochemical catalysis process is an important parameter to study gas-liquid two phase flow behavior, which has a significant effect on the efficiency of water splitting and the heat and mass transfer during the reaction process. In this paper, an experimental system to investigate the dynamic characteristics of O_2 bubbles envolved from the TiO2 photoelectrode surface is designed. The law of O_2 bubble evolution followed d∝t^x, which x equaled to 0.5～0.85 within bubble formation 10 ms, and x≈ 0.33 after 10 ms. The images of bubble nucleation initial stage were captured. The bubble nucleation spatiotemporal scale was obtained by optical method. Finally, the influence of laser power and constant bias on bubble detachment diameter was also presented.

关 键 词：TiO2光电极 氧气泡 气泡成核 气泡生长 脱离直径 

分 类 号：O359[理学—流体力学]