【作者】 胡健； 高璞珍； 许超； 李少丹； 郑强；

【Author】 HU Jian;GAO Pu-zhen;XU Chao;LI Shao-dan;ZHENG Qiang;Key Discipline Lab.of Nuclear Safety and Simulation Technology,Harbin Engineering University;

【机构】 哈尔滨工程大学核安全与仿真技术国防重点实验室；

【摘要】 本文采用高速摄影仪从可视化矩形窄通道宽面观察了系统压力在0.55 MPa时,通道内气泡生长及的变化规律。实验工质为去离子水,质量流速G=300~500 kg/(m~2·s),热流密度q=86.4~225.7 kW/m~2,流体入口过冷度△T=25.5~45.5 K。实验结果表明,在较高压力条件下,气泡直径尺寸只有0.15 mm左右,从核化点产生后便迅速脱离并沿着壁面滑移,在拍摄取景范围内很难观察到气泡的溃灭。质量流速较高时,随着热流密度的增加,滑移气泡的直径增大;而质量流速较低时,滑移气泡直径随热流密度的变化规律性不强。随着入口过冷度的增加,气泡生长后期直径减小。入口过冷度较高时,随着质量流速的增加,滑移气泡的直径减小;入口过冷度较低时,滑移气泡的直径受质量流速的影响很小。更多还原

【Abstract】 The characteristic of bubble growth is visually observed in a narrow rectangular channel using high speed camera.The experiment was conducted over the following range of conditions:pressure,0.55 MPa;mean liquid velocity,300~500kg/(m~2 ? s);heat flux,86.4 ~ 225.7 kW/m~2;and inlet subcooling,25.5~45.5 K.Experimental results show that the bubble diameter is just about0.15 mm under higher system pressure and the period during which bubbles attaching to the nucleate site is very short.The bubbles keep growing when slide along the heating wall rather than lifting off the surface,and the bubbles rarely collapse in the observation window.When the mass flux is high,the bubble diameter increases with increasing the heat flux,but when the mass flux is low,the variation trend of bubble diameters expresses no obvious law.The bubble diameter decreases with increasing the inlet subcooling.At high inlet subcooling,the bubble diameter decreases with increasing the mass flux,however at lower mass flux,the mass flux has less effect on bubble diameters.更多还原