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借助高速摄像机,对倾斜和摇摆条件下矩形通道(43 mm×3.25 mm×2000 mm)内泡状流局部界面参数的横向分布特性进行实验研究,包括局部气泡比例、空泡份额及界面面积浓度(IAC)。实验结果表明,竖直、倾斜及摇摆条件下,局部气泡比例、空泡份额及IAC三者的横向分布形状相类似。竖直静止及摇摆至竖直位置时,通道内中间较大范围内各局部参数变化缓慢,在xi/(w/2)=±0.5(xi为以通道宽边中心轴线为原点到窄边内壁面的距离,w为宽边尺寸)附近出现峰值;随着倾斜和摇摆角度的增大,下壁面附近峰值被削弱,上壁面附近峰值被加强。实验摇摆参数范围内,摇摆时局部参数的横向分布与实验段倾斜至相同角度时的分布十分相近;主要原因为在横向上摇摆引起附加惯性浮力远小于气泡受到的浮力。
The lateral distribution characteristics of the local interface parameters of bubbly flow in a rectangular channel (43 mm × 3.25 mm × 2000 mm) under tilting and swaying conditions were experimentally studied with a high-speed camera, including local bubble ratio, void fraction, and interface area concentration IAC). The experimental results show that under vertical, inclined and wobbled conditions, the partial bubble ratio, void fraction and IAC cross-sectional shape are similar. When standing still and swinging to the upright position, the local parameters in the middle of the channel change slowly. When xi / (w / 2) = ± 0.5 (xi is the distance from the center of the broadside of the channel to the narrow side The distance of the wall surface, w is the width of the broad side), and the peaks near the lower wall are weakened and the peaks near the upper wall are strengthened with the increase of the inclination and swing angle. The experimental results show that the lateral distribution of local parameters is similar to that of the experimental section when tilted to the same angle. The main reason is that the additional inertial buoyancy in the lateral direction is far less than the buoyancy of the bubble.