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Effects of fluid viscosity on a moving sonoluminescing bubble
, Article Physical Review E - Statistical, Nonlinear, and Soft Matter Physics ; Volume 84, Issue 2 , August , 2011 ; 15393755 (ISSN) ; Mirheydari, M ; Rezaee, N ; Ebrahimi, H ; Sharif University of Technology
2011
Abstract
Based on the quasi-adiabatic model, the parameters of the bubble interior for a moving single bubble sonoluminescence in water, adiponitrile, and N-methylformamide are calculated for various fluid viscosities. By using a complete form of the hydrodynamic force, the bubble trajectory is calculated for a moving single bubble sonoluminescence (m-SBSL). It is found that as the fluid viscosity increases, the unique circular path changes to an ellipsoidal and then linear form and along this incrementally increase of viscosity the light intensity increases. By using the Bremsstrahlung model to describe the bubble radiation, gradual increase of the viscosity results in brighter emissions. It is...
Optimization of the bubble radius in a moving single bubble sonoluminescence
, Article Physica Scripta ; Volume 83, Issue 5 , 2011 ; 00318949 (ISSN) ; Sadighi Bonabi, R ; Rezaee, N ; Ebrahimi, H ; Sharif University of Technology
Abstract
A complete study of the hydrodynamic force on a moving single bubble sonoluminescence in N-methylformamide is presented in this work. All forces exerted, trajectory, interior temperature and gas pressure are discussed. The maximum values of the calculated components of the hydrodynamic force for three different radii at the same driving pressure were compared, while the optimum bubble radius was determined. The maximum value of the buoyancy force appears at the start of bubble collapse, earlier than the other forces whose maximum values appear at the moment of bubble collapse. We verified that for radii larger than the optimum radius, the temperature peak value decreases
A unique circular path of moving single bubble sonoluminescence in water
, Article Chinese Physics B ; Volume 20, Issue 7 , 2011 ; 16741056 (ISSN) ; Mirheydari, M ; Ebrahimi, H ; Rezaee, N ; Nikzad, L ; Sharif University of Technology
2011
Abstract
Based on a quasi-adiabatic model, the parameters of the bubble interior for a moving single bubble sonoluminescence (m-SBSL) in water are calculated. By using a complete form of the hydrodynamic force, a unique circular path for the m-SBSL in water is obtained. The effect of the ambient pressure variation on the bubble trajectory is also investigated. It is concluded that as the ambient pressure increases, the bubble moves along a circular path with a larger radius and all bubble parameters, such as gas pressure, interior temperature and light intensity, increase. A comparison is made between the parameters of the moving bubble in water and those in N-methylformamide. With fluid viscosity...