Effect of Bulk Flow Pulsation on the Filtering Process for Porous Columns with Different Permeability

IF 1.3 4区工程技术 Q2 ENGINEERING, AEROSPACE

Microgravity Science and Technology Pub Date : 2025-02-20 DOI:10.1007/s12217-024-10158-0

Anna Belyaeva, Boris Maryshev

引用次数: 0

Abstract

The effect of the temporal variation of the hydraulic gradient on the transport of the impurity pulses in a porous column has been studied experimentally. The measurements were made using horizontal columns with different porosity and therefore different permeability. The temporal changes in the hydraulic gradient as well as the intensity of the bulk flow were organized by changing the vertical position of the outlet valve. Only harmonic fluctuations of the filtration flow intensity have been taken into account. It was shown that the effect of the time-varying flow rate is only noticeable when concentration convection develops against the background of the main advective flow. Changing the period and amplitude of the flow pulsations caused by changing the hydraulic gradient at the ends of the column will only change the impurity transport rate, not the amount of impurity leached.

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体流脉动对不同渗透率多孔柱过滤过程的影响

实验研究了水力梯度的时间变化对杂质脉冲在多孔柱中输运的影响。采用不同孔隙度和渗透率的水平柱进行测量。通过改变出口阀的垂直位置来组织水力梯度和散流强度的时间变化。只考虑了过滤流强度的谐波波动。结果表明，只有在主要的平流背景下形成浓对流时，流速随时间变化的影响才会明显。改变柱端水力梯度引起的流动脉动周期和振幅，只会改变杂质输运速率，不会改变杂质浸出量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Microgravity Science and Technology 工程技术-工程：宇航

CiteScore

3.50

自引率

44.40%

发文量

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