Abstract
Based on the volume of fluid method (VOF), the rising characteristics of bubbles in near-wall static water are studied. In this study, the influence of the wall on the rising motion of the bubble was studied by changing the distance of the bubble wall, the diameter of the bubble, the arrangement of the bubble and the size ratio, etc. The influence is expressed as the average swing amplitude of the “Z”-shaped motion when the bubble rises. The study found that in the case of a single bubble, the wall surface has a certain influence on the rise of the bubble, and its degree is affected by the bubble wall distance and the bubble diameter. The influence of bubble wall distance is more obvious. The greater the bubble wall distance, the less the bubble is affected by the wall; in the case of double bubbles, the influence of the interaction force between the bubbles is significantly greater than the wall surface.
Highlights
Two-phase flow is a very common phenomenon
It is divided into gas-liquid two-phase flow, solid-liquid two-phase flow and liquid-liquid twophase flow according to the phase state of the substances constituting the flow system [1]
When the bubble rises freely, the bubble will rise in a straight line; when the bubble is located near the wall, the bubble will swing and rise in a “Z” shape
Summary
Two-phase flow is a very common phenomenon. As an important branch of fluid mechanics, it began to develop rapidly in the 1960s. The influence of the wall surface on the motion characteristics of single and double bubbles will be explored, and the discipline of motion of bubbles near the wall will be studied. Komasawa et al [17] studied the motion characteristics of stationary bubbles in downward flowing water, and found that the experimental results are consistent with the motion characteristics of bubbles rising freely. Examined the influence of initial bubble conditions on bubble rise motion, two-dimensional direct numerical simulations of the motion of a gas bubble rising in viscous liquids were carried out by a coupled level set/volume-of-fluid method. By changing the bubble diameter, bubble wall distance, etc., the motion path, rising speed, and surrounding flow field changes of the bubbles in the near-wall domain are studied to analyze the changes in the bubble motion characteristics. The double-bubble is used to analyze the interaction between the bubbles, and the bubble interaction and wall influence are analyzed and studied by changing the arrangement of the bubbles
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