{"title":"The Experimental Study of the Dynamics of a Gas Bubble in a Sinusoidal Channel with Axis Symmetry","authors":"Ivan Karpunin","doi":"10.1007/s12217-025-10192-6","DOIUrl":null,"url":null,"abstract":"<div><p>The dynamics of a gas bubble in a vertical axisymmetric channel filled with fluid is studied experimentally. The aim of the work is to investigate the features of gas bubble rising in a liquid in a channel with a periodically changing profile (sinusoidal) along the axis in the field of gravity and at oscillations of the liquid. The main characteristic in the experiments the average bubble rise velocity. It is shown that in the gravitational field the bubble rise velocity significantly depends on the size and shape of the bubble due to its interaction with the walls of the inhomogeneous cross-section channel and physicochemical properties of the liquid. In the case of the liquid oscillations, the intensity of the gas bubble rise is determined by the amplitude and frequency of the oscillations and differs from the non-vibration case. For both cases, the bubble shape variations and the instantaneous velocity values are experimentally investigated as the bubbles pass through different cross-sections of the channel. For small-sized gas inclusions, a mode of maintenance in a quasi-equilibrium state against the background of oscillations relative to the mean position is found. The experimental results are analyzed and generalized at the plane of control dimensionless parameters: Reynolds, Bond and Weber numbers, drag coefficient. The mechanism of controlling the oscillation and velocity of gas bubble rise by means of a channel of inhomogeneous shape and the presence of fluid oscillations with zero mean flow rate presented in this work is of interest from the point of view of increasing the efficiency of mass transfer processes and heat sink in various technological applications.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 4","pages":""},"PeriodicalIF":1.3000,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microgravity Science and Technology","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s12217-025-10192-6","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, AEROSPACE","Score":null,"Total":0}
引用次数: 0
Abstract
The dynamics of a gas bubble in a vertical axisymmetric channel filled with fluid is studied experimentally. The aim of the work is to investigate the features of gas bubble rising in a liquid in a channel with a periodically changing profile (sinusoidal) along the axis in the field of gravity and at oscillations of the liquid. The main characteristic in the experiments the average bubble rise velocity. It is shown that in the gravitational field the bubble rise velocity significantly depends on the size and shape of the bubble due to its interaction with the walls of the inhomogeneous cross-section channel and physicochemical properties of the liquid. In the case of the liquid oscillations, the intensity of the gas bubble rise is determined by the amplitude and frequency of the oscillations and differs from the non-vibration case. For both cases, the bubble shape variations and the instantaneous velocity values are experimentally investigated as the bubbles pass through different cross-sections of the channel. For small-sized gas inclusions, a mode of maintenance in a quasi-equilibrium state against the background of oscillations relative to the mean position is found. The experimental results are analyzed and generalized at the plane of control dimensionless parameters: Reynolds, Bond and Weber numbers, drag coefficient. The mechanism of controlling the oscillation and velocity of gas bubble rise by means of a channel of inhomogeneous shape and the presence of fluid oscillations with zero mean flow rate presented in this work is of interest from the point of view of increasing the efficiency of mass transfer processes and heat sink in various technological applications.
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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