摘要
本文的研究对象是一个宽高比分别为0.99和0.25,以水为对流介质的矩形Rayleigh-Bénard(RB)湍流热对流系统,通过改变下导板加热片输入功率的空间分布,使空间非均匀加热强度δ等于0, 1/6, 1/4, 1/3,研究空间非均匀加热对湍流流动结构的影响.实验中Rayleigh数(Ra)从1.8×109变化到9.1×109,Prandtl数(Pr)固定为5.4.结果表明,非均匀加热提高了流体流动速度,并使羽流向边壁附近聚集,从而增强了系统的整体热输运效率.
In this study the influence of non-uniform heating on flow dynamics is explored experimentally within a rectangular cell （aspect ratios Fx = 0.99 and Fy = 0.25）. The measurements are carried out over a wide range of non-uniform heating intensity （δ=0,1/6,1/4,1/3） at a constant Prandtl number （Pr≈5.4） and Rayleigh number changed from 1.8×10^9 to 9.1×10^9. The velocity measurements reveal that the flow velocity is increasing on the effect of non-uniform heating. With increasing δ, the plumes move towards to the boundary, thereby enhancing the overall heat transport efficiency of the system.
作者
吴磊
周全
WU Lei;ZHOU Quan(Shanghai University,Shanghai Institute of Applied Mathematics and Mechanics,Shanghai 200072,China)
出处
《力学季刊》
CSCD
北大核心
2018年第3期486-493,共8页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(11572185
11732010)
