کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10566245 972309 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Estimation of ultrasound induced cavitation bubble temperatures in aqueous solutions
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Estimation of ultrasound induced cavitation bubble temperatures in aqueous solutions
چکیده انگلیسی
Mean acoustic cavitation bubble temperatures have been measured in a series of aqueous solutions containing C1-C5 aliphatic alcohols, at 355 kHz. The method relies on the distribution of hydrocarbon product yields produced from the recombination of methyl radicals generated on the thermal decomposition of the alcohols. The mean bubble temperature was found to decrease with increasing concentration of alcohol with the effect being more pronounced the higher the molecular weight (the lower the vapour pressure) of the alcohol. It is shown that the decrease in the temperatures measured correlates very well with an increase in the surface excess of the alcohol, similar to that previously reported for the quenching of sonoluminescence in aqueous solutions containing alcohols [J. Phys. Chem. B 101 (1997) 10845; J. Phys. Chem. B 103 (1999) 9231]. The measured temperatures ranged from 4600 ± 200 K at zero alcohol concentration to 2300 ± 200 K at 0.5 M t-butanol. The validity of the method is discussed and it is concluded that even though a number of assumptions need to be applied the results appear to indicate that the method gives an accurate measure of the mean bubble temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 12, Issue 5, April 2005, Pages 325-329
نویسندگان
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