在抽吸有限体积杂质的情况下,一维垂直流经多孔域的稳定性

IF 1.3 4区 工程技术 Q2 ENGINEERING, AEROSPACE
Boris S. Maryshev, Lyudmila S. Klimenko, Nikolay V. Kolchanov
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引用次数: 0

摘要

解决了多孔介质矩形域中一维过滤流的稳定性问题。当部分杂质逆重力流过该区域时,就会发生流动。研究表明,不稳定性具有绝对性。在浓度脉冲的后向前沿观察到了瑞利-泰勒不稳定性。在这种情况下,观测时间总是小于脉冲通过区域的时间。在考虑到固定和堵塞的情况下,提出了一个理论模型来描述这种现象。研究了问题参数对不稳定开始的特征时间的影响。计算结果与实验数据的比较表明,所选模型是合适的。分析了增加该时间的方法。结果表明,增加不稳定时间的唯一方法是大幅减少浮力的影响。后一种力可以通过改变重力来减小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Stability of One-Dimensional Vertical Flow Through a Porous Domain Under Pumping of a Finite Volume of Impurity

Stability of One-Dimensional Vertical Flow Through a Porous Domain Under Pumping of a Finite Volume of Impurity

Stability of One-Dimensional Vertical Flow Through a Porous Domain Under Pumping of a Finite Volume of Impurity

The problem of stability of one-dimensional filtration flow in a rectangular domain of porous medium is solved. The flow occurs when a portion of impurity is transported through the region against gravity. It is shown that the instability has an absolute character. A Rayleigh-Taylor instability is observed at the backward front of the concentration pulse. In this case, the observation time is always less than the passage time of the pulse through the domain. A theoretical model is proposed to describe this phenomenon taking into account immobilization and clogging. The influence of the problem parameters on the characteristic time of instability onset is investigated. Comparison of computational results with experimental data has shown the appropriateness of the chosen model. The ways of increasing this time are analyzed. It is shown that only one way to increase the instability time is to significantly reduce the buoyancy force impact. The latter force can be diminish by alteration of the gravity force.

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来源期刊
Microgravity Science and Technology
Microgravity Science and Technology 工程技术-工程:宇航
CiteScore
3.50
自引率
44.40%
发文量
96
期刊介绍: Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology
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