An experimental study of unsteady natural convection in a reservoir model cooled from the water surface

被引：28
|
作者：
Bednarz, Tomasz P. [1 ]
Lei, Chengwang [1 ]
Patterson, John C. [1 ]
机构：
[1] James Cook Univ N Queensland, Sch Engn, Townsville, Qld 4811, Australia
来源：
EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2008年 / 32卷 / 03期
基金：
澳大利亚研究理事会;
关键词：
natural convection; reservoirs; exchange flows; thermo-chromic liquid crystals;
D O I：
10.1016/j.expthermflusci.2007.10.007
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The general characteristics of unsteady natural convection flow in a reservoir model cooled from the water surface are presented in this paper. Flow visualization was carried out using thermo-chromic liquid crystals, and quantitative temperature measurements were conducted using a PIT (particle image thermometry) technique. The experimental photographs clearly show different stages of the flow development including the growth of a thermal boundary layer below the water surface, the onset of convective instabilities, and further flow development. The present results indicate that the convective motions in reservoirs induced by night-time cooling have a significant impact on water quality and transport of nutrients and pollutants. (C) 2007 Elsevier Inc. All rights reserved.
引用
收藏
页码：844 / 856
页数：13
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