مهندسی شیمی ایران

مهندسی شیمی ایران

مدل‌سازی ریاضی انتقال جرم در آبزدایی اسمزی نخودفرنگی در یک فرایند بستر سیال

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکتری مهندسی شیمی، دانشگاه گیلان
2 دانشیار مهندسی شیمی، دانشگاه گیلان
چکیده
در این مقاله، فرایند آبزدایی اسمزی نخودسبز با دو روش ناپیوسته و بستر سیال بررسی‌شد. عملیات انتقال جرم در سه غلظت 10، 20 و 25 درصد (%w/w) از محلول آب نمک و سه دمای 30، 40 و C 50 انجام‌شد. در روش ناپیوسته از مدل دوپارامتری آزورا برای محاسبۀ مقادیرتعادلی آب جداشده، WL∞ و نمک جذب‌شده، SG∞ استفاده‌شد و هم‌چنین، مقادیر ضرایب نفوذ آب و نمک بااستفاده‌از حل تحلیلی قانون دوم فیک حساب‌شد. درادامه، فرایند انتقال جرم در بستر سیال، مدل‌سازی ریاضی شد. نتایج هر دو روش نشان‌داد که در اثر افزایش دما، غلظت محلول اسمزی و زمان، مقادیر WL و SG افزایش‌یافت. هم‌چنین، محاسبۀ این مقادیر با مدل ریاضی، هماهنگی خوبی با داده‌های آزمایشگاهی حاصل‌از بستر سیال نشان‌داد. مقدار خطای نسبی متوسط MRE در دمای50 درجۀ سلسیوس و غلظت‌های 10، 20 و 25 (%w/w) به‌ترتیب برابر 1/5، 1/2 و 2/1 درصد برای SG و 1/6، 1/0 و 1/2 درصد برای WL است. مقادیر WL و SG در روش ناپیوسته و بستر سیال به‌ترتیب بعد از مدت زمان 180 دقیقه و 60 دقیقه به تعادل رسید که نشان‌دهندۀ برتری استفاده‌از فرایند بستر سیال است.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Mathematical Modelling of Mass Transfer During Osmotic Dehydration of Green Peas in a Fluidized Bed Process

نویسندگان English

F. Rahimpour 1
B. Abbasi Souraki 2
1 PhD. Student of of Chemical Engineering, University of Guilan
2 Associate Professor of Chemical Engineering, University of Guilan
چکیده English

In this study the osmotic dehydration of green pea in batch and fluidized bed processes was investigated. Mass transfer operation was carried out at the three concentrations 10, 20 and 25 % w/w of water-salt solution and three temperatures 30, 40 and 50°C. In the batch process, the Azuara two-parameter model was applied to determine the values of WL∞ and SG∞, and the values of Dew and Des were estimated using the analytical solution of Fick's second law. Mass transfer process was mathematically modelled in the fluidized bed process. The results of both methods indicated that due to the increase in temperature, concentration of osmotic solution and time, the values of WL and SG increased.
The predictions of the mathematical model were in good agreement with the experimental data. Mean relative error (MRE) values between the predictions and experimental data, at 50°C and concentrations of 10, 20, and 25 (%w/w) were 1.5, 1.2, and 1.2% for SG, and 1.6, 1.0, and 1.2% for WL, respectively. The values of WL and SG in the batch method and fluidized bed process reached equilibrium after 180 minutes and 60 minutes, respectively, which reveals the advantage of using the fluidized bed process.

کلیدواژه‌ها English

Osmotic Dehydration
Fluidized Bed
Mass Transfer
Green Pea

 

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