کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
224399 464441 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Predicting moisture profiles in potato and carrot during convective hot air drying using isothermally measured effective diffusivity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Predicting moisture profiles in potato and carrot during convective hot air drying using isothermally measured effective diffusivity
چکیده انگلیسی

Temperature and moisture profiles were obtained from potato (1.4 and 2.8 cm diameter) and from carrot core (1.4 cm diameter) and cortex (0.7 cm diameter) during convective hot air drying at 70 °C and 1.5 m/s air velocity. These samples represent hygroscopic non-porous materials and remain non-porous throughout drying with porosity remaining below 0.2. To analyze moisture transfer during convective drying, a simultaneous heat and moisture transfer model was developed based on Fick’s diffusion equation. What was unique about this model from previous models is that the effective diffusivity and its temperature dependence were obtained from true isothermal conditions and then applied to model the moisture profile during a non-isothermal drying condition. The model accurately predicted moisture loss as a function of drying time and position for the potato and carrot samples during convective hot air drying and further demonstrates the importance and improved accuracy of obtaining diffusion coefficients and its temperature dependence under isothermal conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Food Engineering - Volume 84, Issue 4, February 2008, Pages 516–525
نویسندگان
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