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The Effect of Ambient Parameters on Argon Single Bubble Sonoluminescence in Sulfuric Acid

Bemani Lirgashasi, Foroud | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42943 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi Bonabi, Rasoul
  7. Abstract:
  8. In this research, using a hydrochemical model alongside three dominant instabilities of shape, Bjerknes and diffusion, the effect of ambient parameters on the single bubble sonoluminescence (SBSL) in Sulfuric Acid (SA) is studied. The phase diagrams of the bubble in the (R0 − Pa) space are presented, and the parametric dependence of the light intensity is discussed. In a part of this research a hot plasma core is considered at the center of the bubble. The study of ambient temperature shows that in contrast to water, the calculated thermalbremsstrahlung mechanism of light emission at the fixed degassing condition of high SA concentrations shows that with increasing the temperature of aqueous SA solutions, the light intensity increases. However, at diluted SA solutions similar to water, the light intensity decreases with increasing the ambient temperature. For SA 50% (wt.) it was observed that the emitted light is almost temperature independent. Furthermore, it is found that at the fixed temperatures of 20C, 10C and 0C, the SA 65% (wt.), 50% (wt.) and 45% (wt.) aqueous solutions have the maximum light emission respectively. It is found that the trends of the calculated maximum SBSL intensity in water and SA solutions are different. It is also noticed that at the fixed degassing condition, increasing of the ambient pressure improves the light emission of the argon bubble in SA, while in water the SL is dimmed by amplification of ambient pressure. Considering high temperature and pressure during single bubble sonoluminescence collapse, a hot plasma core is generated at the center of the bubble. In this report a statistical mechanics approach is used to calculate the core pressure and temperature. Hydrochemical model alongside the plasma core is used to study the bubble dynamics in two host liquids of water and sulfuric acid 85 wt % containing Ar atoms. Calculation shows that the extreme pressure and temperature in the core is mainly due to the interaction of the ionized Ar atoms and electrons, which is one step forward to the sonofusion
  9. Keywords:
  10. Sulfuric Acid ; Single Bubble Sonoluminescence (SBSL) ; Ambient Parameters ; Hydrochemical Model ; Hot Plasma Core

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