气液两相泡状流界面浓度的研究

用双头电导探针对水平管泡状流局部界面参数进行了测量。用概率统计方法对测量结果进行了处理 ,计算了气泡速度、气泡直径、气泡频率、界面浓度等局部参数。结果表明 ,界面浓度沿径向的分布与气泡频率沿径向的分布类似 ,都是靠管上壁较大、靠管下壁较小。其峰值都在距上壁r/R =0 .75— 0 .95之间。与直接用探针测得的速度计算结果比较 ,速度要高 0— 8.7% ,界面浓度要大 0— 35 .2 %。

Study on the Area Concentration of Air-Water Bubbly Flow

An experimental study of the internal area concentration of air-water bubbly flow was described. The double sensor resistivity probe technique was applied for measurements of local interfacial parameters. A probability statistical method was used to calculate the local parameters. The result indicated that the interfacial area concentration profiles very closely followed the bubble passing frequency distributions. Irrespective of the gas velocity, the internal flow structure had a general similarity at vertical direction in terms of local peaking toward the top of the channel wall occurring at about r/R=0.75-0.95. Compared with the results calculated with the I. Kataoka′s model in which the velocity was measured by the probe directly, the bubble velocity was 0-8.7% and the area concentration was 0-35.2%.