بررسی عددی بهبود نرخ انتقال حرارت در رادیاتور خودرو با استفاده از لوله‌های ریز مجرا و چیدمان مناسب لوله‌ها

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه امام علی (ع)، تهران، ایران

2 دانشگاه صنعتی مالک اشتر، تهران، ایران

چکیده

استفاده از مخلوط اتیلن‌گلیکول و آب به‌عنوان سیال عامل دارای ضد یخ در رادیاتور خودرو، سبب کاهش نرخ انتقال حرارت و افزایش افت فشار می‌شود. بر اساس نتایج به‌دست‌آمده، مخلوط 70%-30% حجمی آب و اتیلن‌گلیکول 20%-12% انتقال حرارت کمتر و 20%-5% افت فشار بیشتری نسبت به آب خالص دارد. به‌منظور افزایش نرخ انتقال حرارت در رادیاتور، می‌توان از تغییرات هندسی که بر مولفه‌های انتقال حرارت شامل ضریب انتقال حرارت و سطح تبادل گرما تأثیرگذار هستند استفاده کرد. پژوهش حاضر به روش تحلیل عددی و با استفاده از روش‌های دینامیک سیالات محاسباتی به بررسی تأثیر استفاده از ریز مجرا به‌جای لوله‌های ساده، استفاده از لوله با سطح مقطع (-) و (+) شکل و تغییر چیدمان لوله‌های رادیاتور از عمودی به افقی پرداخته است. نتایج نشان می‌دهد استفاده از لوله‌های دارای ریز مجرا می‌تواند 67%-15% نرخ انتقال حرارت در رادیاتور را افزایش دهد همچنین در این حالت ضریب اصطکاک نیز 52%-6% افزایش‌یافته که باعث افت فشار بیشتر می‌شود. همچنین استفاده از چیدمان افقی لوله‌ها در رادیاتور به‌جای چیدمان عمودی، دارای 91%-10% نرخ انتقال حرارت بیشتر می‌باشد.

کلیدواژه‌ها


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