非均匀旋转水平圆筒液-液界面的稳定性

IF 0.7 Q4 THERMODYNAMICS

Interfacial Phenomena and Heat Transfer Pub Date : 2023-01-01 DOI:10.1615/interfacphenomheattransfer.2023050051

Victor Kozlov, Alsu Zimasova, Nikolai Kozlov

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引用次数: 0

摘要

实验研究了高速旋转水平圆柱体中不同密度和高粘度对比液体界面形状在转速调制下的影响。在旋转过程中，更粘稠、密度更高的流体位于腔体外侧边界附近。研究发现，旋转速率的改变会导致初始轴对称液-液界面稳定性的丧失。不稳定性表现为界面上空间周期性准平稳二维起伏的发展。该现象具有阈值特征;调速的临界幅值取决于转速和调速频率。结果表明，“冻结”起伏的出现与开尔文-亥姆霍兹振荡不稳定性有关，并伴随着在相间边界附近强烈涡流的产生。

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STABILITY OF LIQUID-LIQUID INTERFACE IN UNEVENLY ROTATING HORIZONTAL CYLINDER

Effect of rotational velocity modulation on the shape of the interface between liquids with high contrast of viscosities and of different densities, in a rapidly rotating horizontal cylinder is experimentally investigated. During rotation, the more viscous fluid with higher density is located near the lateral boundary of the cavity. It is found that modulation of the rotation rate leads to the loss of stability of the initially axisymmetric liquid-liquid interface. The instability manifests itself in the development of spatially periodic quasi-stationary 2D relief on the interface. The phenomenon has a threshold character; the critical amplitude of velocity modulation depends on the rotation rate and the frequency of velocity modulation. It is shown that the appearance of the "frozen" relief is associated with the Kelvin—Helmholtz oscillatory instability and is accompanied by the generation of intensive vortex flows near the interphase boundary.

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来源期刊

Interfacial Phenomena and Heat Transfer THERMODYNAMICS-

CiteScore

1.70

自引率

40.00%

发文量

期刊介绍： Interfacial Phenomena and Heat Transfer aims to serve as a forum to advance understanding of fundamental and applied areas on interfacial phenomena, fluid flow, and heat transfer through interdisciplinary research. The special feature of the Journal is to highlight multi-scale phenomena involved in physical and/or chemical behaviors in the context of both classical and new unsolved problems of thermal physics, fluid mechanics, and interfacial phenomena. This goal is fulfilled by publishing novel research on experimental, theoretical and computational methods, assigning priority to comprehensive works covering at least two of the above three approaches. The scope of the Journal covers interdisciplinary areas of physics of fluids, heat and mass transfer, physical chemistry and engineering in macro-, meso-, micro-, and nano-scale. As such review papers, full-length articles and short communications are sought on the following areas: intense heat and mass transfer systems; flows in channels and complex fluid systems; physics of contact line, wetting and thermocapillary flows; instabilities and flow patterns; two-phase systems behavior including films, drops, rivulets, spray, jets, and bubbles; phase change phenomena such as boiling, evaporation, condensation and solidification; multi-scaled textured, soft or heterogeneous surfaces; and gravity dependent phenomena, e.g. processes in micro- and hyper-gravity. The Journal may also consider significant contributions related to the development of innovative experimental techniques, and instrumentation demonstrating advancement of science in the focus areas of this journal.