کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7703767 | 1496877 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ultrasound pressure distributions generated by high frequency transducers in large reactors
ترجمه فارسی عنوان
توزیع فشار اولتراسوند تولید شده توسط مبدل های فرکانس بالا در راکتورهای بزرگ
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کلمات کلیدی
اولتراسوند فرکانس بالا، طراحی راکتور، نفوذ صدا، بازتاب، فشار صدا، مبدل های التراسونیک،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
چکیده انگلیسی
The performance of an ultrasound reactor chamber relies on the sound pressure level achieved throughout the system. The active volume of a high frequency ultrasound chamber can be determined by the sound pressure penetration and distribution provided by the transducers. This work evaluated the sound pressure levels and uniformity achieved in water by selected commercial scale high frequency plate transducers without and with reflector plates. Sound pressure produced by ultrasonic plate transducers vertically operating at frequencies of 400Â kHz (120Â W) and 2Â MHz (128Â W) was characterized with hydrophones in a 2Â m long chamber and their effective operating distance across the chamber's vertical cross section was determined. The 2Â MHz transducer produced the highest pressure amplitude near the transducer surface, with a sharp decline of approximately 40% of the sound pressure occurring in the range between 55 and 155Â mm from the transducer. The placement of a reflector plate 500Â mm from the surface of the transducer was shown to improve the sound pressure uniformity of 2Â MHz ultrasound. Ultrasound at 400Â kHz was found to penetrate the fluid up to 2Â m without significant losses. Furthermore, 400Â kHz ultrasound generated a more uniform sound pressure distribution regardless of the presence or absence of a reflector plate. The choice of the transducer distance to the opposite reactor wall therefore depends on the transducer plate frequency selected. Based on pressure measurements in water, large scale 400Â kHz reactor designs can consider larger transducer distance to opposite wall and larger active cross-section, and therefore can reach higher volumes than when using 2Â MHz transducer plates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 27, November 2015, Pages 22-29
Journal: Ultrasonics Sonochemistry - Volume 27, November 2015, Pages 22-29
نویسندگان
Thomas Leong, Michael Coventry, Piotr Swiergon, Kai Knoerzer, Pablo Juliano,