نوع مقاله : مقاله پژوهشی لاتین

نویسندگان

1 عضو هیات علمی دانشگاه بوعلی سینا همدان

2 دانشیار/دانشگاه بوعلی سینا همدان

چکیده

خشک کردن مواد غذایی می‌تواند ماندگاری آن را افزایش داده و موجب کاهش هزینه حمل و نقل و نگهداری آن شود. قانون دوم فیک معمولاً برای ارزیابی فرآیندهای انتقال جرم در فرآیند خشک کردن به روش استاندارد مورد استفاده قرار می‌گیرد و بر اساس بسیاری از فرضیات است. درک معنای انتقال جرم در محصولات می‌تواند روند خشک شدن و کیفیت محصول را بهبود بخشد. دینامیک سیالات محاسباتی (CFD) با استفاده از ریاضیات قدرتمند رایانه‌ای و کاربردی به‌منظور پیش‌بینی انتقال جرم در فرآیندهای صنعتی، شرایط جریان سیال را مدل می‌کند. هدف از این تحقیق بررسی عددی رفتار خشک شدن مغز پسته با استفاده از روش CFD و ارزیابی نتایج عددی در شرایط بستر سیال، نیمه سیال و بستر ثابت و همچنین دمای هوا 45 ، 60 ، 75 و 90 درجه بود. در حین خشک کردن با استفاده از دینامیک سیال محاسباتی و کد CFD Fluent، جریان‌های خارجی و ‌زمینه‎های دما در اطراف جسم استوانه‌ای (10 ×5/7 میلی‌متر) در تجزیه و تحلیل عددی پیش بینی می‌شود. برای آزمایشات خشک کردن از خشک‌کن بستر سیال آزمایشگاهی استفاده شد. قسمت‌های اصلی خشک‌کن فن شعاعی جلو، محفظه خشک‌کن، بخاری برقی، اینورتر و کنترل‌کننده دما است. اتصالات خشک‌کن سنسورهای دمای ورودی و خروجی، بادسنج و کامپیوتر هستند. بخش عددی انجام و با داده‌های تجربی کنار هم قرار گرفت. نتیجه حل عددی در دمای 60 درجه سانتی‌گراد، 75 درجه سانتی‌گراد و 90 درجه سانتی‌گراد به جز در دمای هوا 45 درجه سانتی‌گراد ، بسیار نزدیک به نتایج تجربی بود. میانگین خطای مطلق در بستر ثابت، در دمای 60 ، 75 و 90 درجه سانتیگراد به‌ترتیب 2123/0، 1257/0 و 0337/0 بود که کمتر از دمای 45 درجه سانتی‌گراد و مقادیر R2 برای این دماها به‌ترتیب 9903/0، 9705/0 و 9807/0 بود. با کاهش دما، مقادیر  و χ2 در تمام شرایط بستر افزایش می‌یابد. مقادیر متوسط R2 برای تمام شرایط بستر اعمال شده 9850/0 محاسبه شد. این مقدار نشان داد که توافق زیاد بین نتایج تجربی و راه حل‌های عددی وجود دارد.

کلیدواژه‌ها

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