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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.146

ISSN Imprimir: 2169-2785
ISSN En Línea: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2019030134
pages 1-18

COMPARISON ON BUBBLE DEFORMATION AND INFLUENCE ON WALL SHEAR STRESS IN SIMPLE SHEAR FLOW BETWEEN TWO- AND THREE-DIMENSIONAL COMPUTATIONS

Rui Peng Niu
School of Mechanical Engineering, Changzhou University, Changzhou 213164, Jiangsu Province, China
Ming Jun Pang
School of Mechanical Engineering, Changzhou University, Changzhou 213164, Jiangsu Province, China

SINOPSIS

Bubbly suspensions widely exist in many industrial fields, and thus it is very important to deeply investigate the physical properties of bubbly suspensions for the design and improvement of industrial products. In the present investigations on bubbly suspensions, two- and three-dimensional numerical simulations were performed, in which the obtained results showed some differences. To obtain an accurate and reasonable understanding of physical phenomena, it is necessary to clarify the similarities and differences of the computational results between two- and three-dimensional computations. Therefore, two- and three-dimensional computations are simultaneously carried out in order to study the behavior of a single bubble suspended in a Newtonian fluid under simple shear using the volume of fluid method. The trends of bubble deformation and influence on wall shear stress are analyzed in detail. The present study shows that the difference between the two- and three-dimensional computational results is related to the capillary number (Ca). When Ca ≤ 0.6, the computational results, including the bubble deformation and influence on the wall stress, are similar in the two kinds of computations; however, when Ca > 0.6, the results of the two- and three-dimensional computations show great differences. In the two-dimensional simulation, when the capillary number is relatively large, the bubble stretches and rocks, leading to unstable deformation. Correspondingly, the wall shear stress fluctuates with the bubble deformation. In the three-dimensional simulation, tip streaming occurs in the bubble. However, the wall shear stress remains stable after tip streaming appears.

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