حل تشابهی انتروپی تولیدی جریان نانو سیال سیلیکا- آلومینیوم هیبرید برای نقطه سکون همرفت مخلوط (ترکیبی) روی یک صفحه متخلخل در حضور میدان مغناطیسی: یک مدل ساده جهت خنک‌کاری سطوح

نوع مقاله : پژوهشی کامل

نویسندگان

1 دانشیار، گروه مهندسی مکانیک، دانشگاه حکیم سبزواری، سبزوار، ایران

2 دانشجو کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه حکیم سبزواری، سبزوار، ایران

چکیده

در این تحقیق، انتروپی تولیدی توسط یک نانو‌ سیال در جریان لایه مرزی دو بعدی و دائمی، روی صفحه تخت متخلخل عمودی، به‌همراه میدان مغناطیسی بررسی شد. معادلات حاکم به روش تشابهی به معادلات دیفرانسیل معمولی غیر خطی تبدیل و با روش رانج کوتا حل گردید. در این تحقیق به بررسی تأثیر متغیرهای شناوری، مغناطیس، درصد حجمی نانو سیال، به‌صورت مجزا بر روی سرعت، دما و انتروپی تولیدی بی‌بعد پرداخته شد. نتایج نشان داد که در انتروپی تولیدی، با افزایش متغیر تشابهی، پروفیل دمایی و قدر مطلق گرادیان دمایی کاهش پیدا می‌کند، درنتیجه انتروپی گرمایی تولیدی بی‌بعد کاهش یافته و به سمت صفر میل می‌کند و بعد از مقدار مشخصی لایه مرزی گرمایی ناپدید شده و فقط انتروپی ناشی از اتلافات اصطکاک و مغناطیس تولید می‌شود. بررسی‌ها نشان داد با افزایش غلظت نانو ذرات، سرعت سیال در حدود 30 درصد کاهش می‌یابد و باعث افزایش حدوداً 40 درصدی در پروفیل دمایی سیال می‌شود و همچنین با افزایش میزان مغناطیس، سرعت نانو سیال حدود 15 درصد کاهش و پروفیل دمایی سیال حدود 10 درصد کاهش می‌یابد.

کلیدواژه‌ها

موضوعات


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