微气泡减阻实验研究

Experimental studies on the drag reduction by microbubbles

鉴于微气泡减阻具有良好的工业应用价值,开展了微气泡注入后相关参数对减阻影响的研究。文章对影响微气泡减阻率的各个因素进行了实验研究,详细研究了液相雷诺数、气相平均体积分数和气泡直径对减阻效果的影响。结果表明,微气泡减阻率与液相雷诺数、气相平均体积分数和气泡直径关系密切;目前电解产生气泡的尺度在微米级,在低雷诺数下取得了很好的减阻效果,最高减阻率约为90%。

In view of the good industrial application value of the drag reduction by microbubbles,it carried out the research on the influence of relevant parameters on drag reduction after microbubbles injection.The article conducted an experimental study on the various factors that affect the drag reduction rate of microbubbles.The effect of the liquid Reynolds number,the average volume fraction of the gas phase and the bubble diameter on the drag reduction effect was studied in detail.Result showed that the drag reduction rate by microbubbles is closely related to the liquid Reynolds number,the bubble volume fraction and the bubble diameter.At present,the bubbles produced by electrolysis are in micron scale,and the drag reduction effect is good at low Reynolds number,the maximum drag reduction rate is about 90%.