Buoyant Pulsating Exchange Flow Through a Vent
Buoyant Pulsating Exchange Flow Through a Vent
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DOI：
10.1115/1.2822625
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发表时间：
1995-08
影响因子：
--
通讯作者：
T. Conover;Ranganathan Kumar;J. Kapat
中科院分区：
文献类型：
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作者：
T. Conover;Ranganathan Kumar;J. Kapat
利用盐水/水体系对水平隔板中浮力驱动的双向脉动交换流动进行了实验研究。通过密度测量、流动显示和激光多普勒测速对三种不同通风口长径比(0.106、0.0376和0.008)下的瞬时和脉动交换流动进行了研究。根据两个隔室之间密度差的衰减率，开发了一个时间标度，它将关于顶部隔室密度衰减的所有实验数据折叠成一条曲线。流动可视化被用来了解导致脉动流动的流动特征，并提供主要脉动频率的定量测量。在喷口处，盐水和水之间的界面不稳定是造成脉动的原因。根据LDV测量的功率谱确定了脉动频率及其衰减。对于较小的长径比(0.008和0.0376)，有两个不同的频率以不同的速度衰减，这表明多个流动过程对流动脉动有贡献。
Buoyancy-driven bidirectional pulsating exchange flow through a vent in a horizontal partition is studied experimentally using a brine/water system. The associated transient and pulsating exchange flows were studied by densimetric measurements, flow visualization, and laser Doppler velocimetry (LDV) measurements for three different vent length-to-diameter ratios : 0.106, 0.0376, and 0.008. A time scale, based on the rate of decay of the density difference between the two compartments, is developed that collapses all experimental data regarding the decay of density in the top compartment into one curve. Flow visualization was used to understand the flow features contributing to the pulsating flow and to provide a quantitative measure of the major pulsation frequency. Interfacial instability between brine and water at the vent was found to contribute to the pulsation. The pulsation frequencies and their decay were determined from the power spectrum of LDV measurements. For the small length-to-diameter ratios (0.008 and 0.0376) there are two different frequencies that decay at different rates, suggesting multiple flow processes that contribute to flow pulsations.