Investigation of the Dynamics of a Coating Flow on a Vertical Fiber Immersed in Surrounding Liquid Phase

IF 1.3 4区工程技术 Q2 ENGINEERING, AEROSPACE

Microgravity Science and Technology Pub Date : 2023-08-01 DOI:10.1007/s12217-023-10064-x

Yufeng Zhang, Rong Liu, Xue Chen

引用次数: 0

Abstract

In the present paper, we investigated experimentally the dynamics of coating flow on a vertical fiber immersed in a liquid phase environment. This flow exhibits rich dynamics which is different from the coating flow in air. In the experiments, it is found that the dynamics of immersed coating flow at different flow rates exhibited three flow regimes, i.e., highly regular beads chain, bound state and beads-like flow with irregular coalescence. The regular and irregular beads-like flows correspond to absolute instability and convective instability, respectively. The bound state flow occurs at the boundary of absolute instability and convective instability. The behavior of immersed coating flow is examined by analyzing the spatiotemporal diagram. In addition, we quantitatively investigated three important characteristic parameters of the immersed coating flow, i.e., wave thickness, wave spacing and wave speed in different flow regimes.

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垂直光纤在周围液相中的涂层流动动力学研究

本文通过实验研究了垂直光纤在液相环境中的涂层流动动力学。这种流动表现出与空气中的涂层流动不同的丰富的动力学特性。实验发现，浸没涂层在不同流速下的流动动力学表现为三种流动状态，即高度规则的珠链流动、束缚状态和不规则聚并的珠状流动。规则和不规则的珠状流分别对应于绝对不稳定和对流不稳定。束缚态流动发生在绝对失稳和对流失稳的边界处。通过对浸没涂层的时空图分析，考察了浸没涂层的流动行为。此外，定量研究了不同流型下浸没涂层流动的三个重要特征参数，即波厚、波距和波速。

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