کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7058652 | 1458077 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental study on static flash evaporation of aqueous NaCl solution at different flash speed: Heat transfer characteristics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Flash speed was defined as the mean drop rate of non-equilibrium fraction during fast evaporation stage. Different flash speed, ranging between 4.8Â ÃÂ 10â4 and 2.18Â sâ1, was generated in experiments by adding orifice plate with different orifice diameters between flash and vacuum chamber. Results suggested that, first, shrinking orifice diameter from 80 to 5Â mm can reduce flash speed for about one or two orders of magnitudes, but the adjustable range of flash speed became narrow with the rising of superheat or initial waterfilm height. Second, initial waterfilm concentration had no obvious influence on flash speed. Third, with the rising of flash speed, a minimum value of NEF at turning point existed, but volumetric heat transfer coefficient just increased linearly. At last, fitting formulae for flash duration time and NEF evolution during fast evaporation stage were proposed, depended on which flash speed and its influence on other heat transfer characteristics can be calculated within acceptable error range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 65, October 2013, Pages 584-591
Journal: International Journal of Heat and Mass Transfer - Volume 65, October 2013, Pages 584-591
نویسندگان
Dan Zhang, Daotong Chong, Junjie Yan, Bingchao Zhao,