کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7703383 1496862 2018 26 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Introducing ultrasonic falling film evaporator for moderate temperature evaporation enhancement
ترجمه فارسی عنوان
معرفی اواپراتور سقفی سونوگرافی برای افزایش تبخیر در دمای متوسط
کلمات کلیدی
امواج التراسونیک، سقوط فیلم، تبخیر در دمای متوسط، ارتقاء،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
چکیده انگلیسی
In the present study, Ultrasonic Falling Film (USFF), as a novel technique has been proposed to increase the evaporation rate of moderate temperature liquid film. It is a proper method for some applications which cannot be performed at high temperature, such as foodstuff industry, due to their sensitivity to high temperatures. Evaporation rate of sodium chloride solution from an USFF on an inclined flat plate compared to that for Falling Film without ultrasonic irradiation (FF) at various temperatures was investigated. The results revealed that produced cavitation bubbles have different effects on evaporation rate at different temperatures. At lower temperatures, size fluctuation and collapse of bubbles and in consequence induced physical effects of cavitation bubbles resulted in more turbulency and evaporation rate enhancement. At higher temperatures, the behavior was different. Numerous created bubbles joined together and cover the plate surface, so not only decreased the ultrasound vibrations but also reduced the evaporation rate in comparison with FF. The highest evaporation rate enhancement of 353% was obtained at 40 °C at the lowest Reynolds number of 250. In addition, the results reveal that at temperature of 40 °C, USFF has the highest efficiency compared to FF.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 42, April 2018, Pages 689-696
نویسندگان
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