کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
654760 885269 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental and simulation studies of primary vacuum freeze-drying process of random solids at microwave heating
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Experimental and simulation studies of primary vacuum freeze-drying process of random solids at microwave heating
چکیده انگلیسی

This paper concerns experimental and theoretical studies of freeze-drying process at microwave heating. Two kinds of random solids were dried: material which are assumed to have no internal porosity (ground glass), as well as one containing internal porosity (Sorbonorit 4 activated carbon). Formulated one-dimensional two-region model of freeze-drying process at microwave heating takes into account unknown a priori sublimation temperature Ts(t) and mass concentration of water vapor Cs(t) at moving ice front. Steady capacity of internal heat source is correlated with electric field strength E and dissipation coefficient K(T) in both regions of the material to be dried. Linear temperature dependency of dissipation coefficient is assumed and described by two regression parameters: μ1i and μ2i for dry (i = I) and frozen (i = II) bed, respectively. A correlation between both measured and calculated temperatures of the sample and actual electric field strength was observed. Fairly good agreement between experimental and simulated results was stated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 35, Issue 4, April 2008, Pages 430–438
نویسندگان
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