An experimental study of unsteady natural convection in a reservoir model subject to periodic thermal forcing using combined PIV and PIT techniques

被引:22
作者
Bednarz, Tomasz Piotr [1 ]
Lei, Chengwang [1 ]
Patterson, John C. [1 ]
机构
[1] James Cook Univ, Sch Engn, Townsville, Qld 4811, Australia
基金
澳大利亚研究理事会;
关键词
THERMOCHROMIC LIQUID-CRYSTALS; SLOWLY VARYING TOPOGRAPHY; SOLAR-RADIATION; SIDEARM SUBJECT; HEAT-TRANSFER; SURFACE; SIMULATION; WATER; FLOW;
D O I
10.1007/s00348-009-0641-6
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The present experimental investigation is concerned with the transient flow response in a reservoir model to periodic heating and cooling at the water surface. The experiment reveals a stable stratification of the water body during the heating phase and an unsteady mixing flow in the reservoir during the cooling phase. It is shown that thermal instabilities play an important role in breaking up the residual circulation and initiating a reverse flow circulation in deep waters after the switch of thermal forcing from heating to cooling. Moreover, the heating from the water surface results in a stable large-scale convective roll that is clearly observed in the experiment. The present flow visualization is carried out with the application of thermo-chromic liquid crystals. Quantitative temperature and velocity fields are extracted using Particle Image Thermometry and Particle Image Velocimetry techniques. Understanding of the flow mechanisms pertinent to this problem is important for predicting the transport of nutrients and pollutants across reservoirs.
引用
收藏
页码:107 / 117
页数:11
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