THERMAL SCIENCE

International Scientific Journal

Jiarui Xu

,

Xiaohui Zhang

,

Shan Qing

,

Hao Zhang

,

Hua Wang

DEFORMATION CHARACTERISTICS OF THE BUBBLE IN WATER-BIODIESEL IMMISCIBLE FLUIDS

ABSTRACT
It is of great significance to investigate the rising behavior of a bubble in immiscible fluids in chemical and metallurgical engineering. A 3-D model is established and the free-floating behavior of a single bubble in immiscible fluids (water-heavier liquid and biodiesel-lighter liquid) is numerically simulated by phase-field method. After the fluctuation of a certain distance, the bubble tends to be stable. It takes more time for the larger bubble to reach a stable shape than for the smaller one. The terminal aspect ratio of bubble, ET, with the same size in heavier liquid is smaller than that in lighter liquid. With the increase of bubble size, ET becomes small both in heavier and lighter liquid. Comparing bubble vortex diagrams of different shapes shows that the maximum vortex intensity is the direction in which the bubble shape extends. When the bubble passes through the liquid-liquid interface, it will form “pear”, “inverted pear”, “convex”, and “water drop” shapes successively.
KEYWORDS
Single bubble, Immiscible liquids, Phase-field method, Rising behavior
PAPER SUBMITTED: 2021-07-24
PAPER REVISED: 2022-01-02
PAPER ACCEPTED: 2022-01-03
PUBLISHED ONLINE: 2022-02-05
DOI REFERENCE: https://doi.org/10.2298/TSCI210724008X
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 5, PAGES [4355 - 4365]
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Deformation characteristics of the bubble in water-biodiesel immiscible fluids

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence