Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 14 3 2024 07 22 Dynamics of Confined Spherical Gas Bubbles in an Elastic Vessel Filled with a Thixotropic Fluid Dynamics of Confined Spherical Gas Bubbles in an Elastic Vessel Filled with a Thixotropic Fluid 77 93 3262 10.22044/jsfm.2024.13864.3813 FA Mohammad Pourjafar Chelikdani Department of Mechanical Engineering, Caspian Faculty of Engineering, University of Tehran, Rezvanshahr, Iran Hanieh Asadi Hamzehkandi Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran Kayvan Sadeghy Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran Journal Article 2023 11 21 In this paper numerical investigation of the dynamics of a tiny spherical gas bubble surrounded by an incompressible fluid confined in a vessel has been addressed when the bubble is subjected to accousting forcing of vessel wall. The liquid surrounding the bubble has been assumed to be thixotropic, which has been modelled using the Moore model. The vessel has also been assumed to be deformable obeying the linear-elastic model. After deriving the integro-differential equations governing the bubble dynamics, the governing equations have been solved using ODE23s solver in the MATLAB software numerically. Based on the obtained numerical results, an increase in the parameters such as fluid’s viscosity ratio, vessel wall’s elasticity, vapor pressure, gas pressure trapped in the bubble, and also geometric factor had totally considerable effect to reduce the gaseous bubble’s amplitude of oscillations. However, an increase in the parameters such as fluid’s thixotropy number, break down number, bubble/fluid interfacial surface tension, and also flow Reynolds number has leaded in growth of the bubble oscillations. Moreover, strong fluid’s shear thinning behavior beside small values of interfacial surface tension were known as two important factors to avoid from excessive increase of elastic coating maximum radial stress. In this paper numerical investigation of the dynamics of a tiny spherical gas bubble surrounded by an incompressible fluid confined in a vessel has been addressed when the bubble is subjected to accousting forcing of vessel wall. The liquid surrounding the bubble has been assumed to be thixotropic, which has been modelled using the Moore model. The vessel has also been assumed to be deformable obeying the linear-elastic model. After deriving the integro-differential equations governing the bubble dynamics, the governing equations have been solved using ODE23s solver in the MATLAB software numerically. Based on the obtained numerical results, an increase in the parameters such as fluid’s viscosity ratio, vessel wall’s elasticity, vapor pressure, gas pressure trapped in the bubble, and also geometric factor had totally considerable effect to reduce the gaseous bubble’s amplitude of oscillations. However, an increase in the parameters such as fluid’s thixotropy number, break down number, bubble/fluid interfacial surface tension, and also flow Reynolds number has leaded in growth of the bubble oscillations. Moreover, strong fluid’s shear thinning behavior beside small values of interfacial surface tension were known as two important factors to avoid from excessive increase of elastic coating maximum radial stress. https://jsfm.shahroodut.ac.ir/article_3262_70e0495f0d6115335e6593a74a46301e.pdf