振荡腔内壁面附近固体运动的实验研究

IF 1.3 4区 工程技术 Q2 ENGINEERING, AEROSPACE
O. A. Vlasova, V. G. Kozlov
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引用次数: 0

摘要

实验研究了充液腔柱壁面附近球面和圆柱体在旋转振动作用下的动力学特性。我们考虑(i)轻球形物体在旋转振荡下在圆柱内的运动和(ii)重圆柱体在调制旋转下在水平腔内的运动。在没有振荡的情况下,由于(i)浮力和(ii)离心力的作用,物体被压在腔壁上。用视频配准的方法研究了物体的切向振荡和旋转振荡。结果表明,在振动幅值的临界值处,机体振动引起了导致机体脱离壁面的平均升力。振荡引起的斥力是用物体在(i)重力或(ii)离心力的静态场中悬浮的方法来测量的。结果表明,无因次升力随离壁距离的增加呈指数规律减小。升力的大小仅由切向体相对于周围流体的振荡速度的幅值决定,而旋转体振荡的强度则无关紧要。此外,升力不依赖于与壁面的距离,并随着研究范围ω = 10 - 90的无量纲频率ω增加。振荡引起的固体与腔壁的排斥现象,对于在微重力条件下控制多相介质的有效方法的发展具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental Study of the Solid Motion in the Vicinity of the Wall in an Oscillating Cavity

Experimental Study of the Solid Motion in the Vicinity of the Wall in an Oscillating Cavity

The dynamics of spherical and cylindrical bodies in the vicinity of the cylindrical wall of the cavity filled with fluid under rotational oscillations is experimentally studied. We consider (i) the motion of a light spherical body inside a cylinder under rotational oscillations and (ii) the motion of the heavy cylindrical body in a horizontal cavity under modulated rotation. In the absence of the oscillations, the bodies are pressed against the cavity walls due to the action of (i) the buoyant force and (ii) the centrifugal force. The tangential and rotational body oscillations are studied by means of video registration. It is found that the body oscillations induce the averaged lift force that is responsible for the detachment of the body from the wall at the critical value of the amplitude of the body oscillations. The oscillation-induced repulsive force is measured by the method of the body suspension in a static field of (i) gravitational force or (ii) centrifugal force. It is found that the dimensionless lift force decreases with the distance from the wall according to the exponential law. The magnitude of the lift force is determined only by the amplitude of the velocity of the tangential body oscillation relative to the surrounding fluid while the intensity of the rotational body oscillations is of no importance. Also, the lift force does not depend on the distance to the wall and increases with the dimensionless frequency ω in the studied range ω = 10 – 90. The phenomenon of the oscillation-induced repulsion of the solid from the cavity wall is of interest for the development of an effective method for the control of multiphase media under microgravity conditions.

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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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