AIR-WATER-INTERFACE AREA IN SELF-AERATED FLOWS

被引：7
|
作者：
CHANSON, H
机构：
[1] Department of Civil Engineering, The University of Queensland, Brisbane
来源：
WATER RESEARCH | 1994年 / 28卷 / 04期
关键词：
AIR-WATER INTERFACE AREA; AIR ENTRAINMENT; SELF-AERATION; AIR-WATER GAS TRANSFER; SPILLWAYS;
D O I：
10.1016/0043-1354(94)90100-7
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In high velocity open channel flows, air is entrained at the free surface. This process is called self-aeration. In air-water flows the presence of air bubbles within the flow increases substantially the amount of air-water interface area and enhances the air-water transfer of atmospheric gases (e.g. nitrogen and oxygen). This paper presents a method to estimate the air-water interface area in uniform self-aerated flows on chutes and spillways. It is shown that the interface area is a function of the channel slope, discharge and roughness height only. The results provide a simple estimation of the air-water interface area and hence enable more accurate calculations of air-water gas transfer in hydraulic structures.
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页码：923 / 929
页数：7
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