Gaseous bubble oscillations in anisotropic non-Newtonian fluids under influence of high-frequency acoustic field

All-Russian conference on Nonlinear Waves: Theory and New Applications

Golykh, R.N.^1

Department of Measurement and Automation Methods and Tools, Biysk Technological Institute of FSBEI, Altai State Technical University Named after I.I. Polzunov, Biysk city, Russia^1

关键词: Bubble oscillation;    Fluid flow parameters;    General equations;    High frequency acoustics;    Non-Newtonian fluid flow;    Non-Newtonian fluids;    Rheological property;    Spherical bubbles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/722/1/012010/pdf
DOI  :  10.1088/1742-6596/722/1/012010

来源: IOP

【 摘 要 】

Progress of technology and medicine dictates the ever-increasing requirements (heat resistance, corrosion resistance, strength properties, impregnating ability, etc.) for non-Newtonian fluids and materials produced on their basis (epoxy resin, coating materials, liquid crystals, etc.). Materials with improved properties obtaining is possible by modification of their physicochemical structure. One of the most promising approaches to the restructuring of non-Newtonian fluids is cavitation generated by high-frequency acoustic vibrations. The efficiency of cavitation in non-Newtonian fluid is determined by dynamics of gaseous bubble. Today, bubble dynamics in isotropic non-Newtonian fluids, in which cavitation bubble shape remains spherical, is most full investigated, because the problem reduces to ordinary differential equation for spherical bubble radius. However, gaseous bubble in anisotropic fluids which are most wide kind of non-Newtonian fluids (due to orientation of macromolecules) deviates from spherical shape due to viscosity dependence on shear rate direction. Therefore, the paper presents the mathematical model of gaseous bubble dynamics in anisotropic non-Newtonian fluids. The model is based on general equations for anisotropic non-Newtonian fluid flow. The equations are solved by asymptotic decomposition of fluid flow parameters. It allowed evaluating bubble size and shape evolution depending on rheological properties of liquid and acoustic field characteristics.