Air entrainment in the developing flow region of plunging jets .1. Theoretical development

被引：73

作者：

Cummings, PD ^{[1
]}

Chanson, H ^{[1
]}

机构：

[1] UNIV QUEENSLAND, DEPT CIVIL ENGN, BRISBANE, QLD 4072, AUSTRALIA

来源：

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME | 1997年 / 119卷 / 03期

关键词：

D O I：

10.1115/1.2819286

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Air-water bubbly flows are encountered in many engineering applications. One type of air-water shear flows is the developing flow region of a plunging jet. The mechanisms of air entrainment by plunging liquid jets are discussed in the light of new experimental evidence. Then the air bubble diffusion is analyzed analytically in the near-flow field of both circular and two-dimensional plunging jets. The theoretical developments are compared with existing circular plunging jet data and new experiment performed with a two-dimensional vertical supported jet. The study highlights two mechanisms of air entrainment at the plunge point depending upon the jet impact velocity and results suggest that the dispersion of air bubbles within the shear layer is primarily an advective diffusion process.

引用

页码：597 / 602

页数：6

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