بررسی تاثیر پارامترهای ترموفیزیکی بر انتقال حرارت در جریان نانوسیال غیر نیوتنی در مبدل حرارتی

علوم کاربردی و محاسباتی در مکانیک

مقاله 2، دوره 37، شماره 3 - شماره پیاپی 41، شهریور 1404، صفحه 27-42   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2024.86865.1242

نویسندگان

حبیب کریمی¹؛ کوروش جواهرده^{* 2}

¹گروه مکانیک، واحد رودسر و املش، دانشگاه آزاد اسلامی، رودسر، ایران.

²دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران.

چکیده

در مطالعه حاضر به بررسی افزایش انتقال حرارت ترکیبی نانوسیال در سیال غیر نیوتنی در مبدل حرارتی با لوله‌های مارپیچ قائم پرداخته می‌شود. نسبت‌های انحنای مختلف برای لوله‌های مارپیچ قائم و غلظت حجمی نانو ذرات با نسبت‌های ۰ تا ۲٪ در نظر گرفته شده است. همچنین شاخص توانی سیال غیر نیوتنی ۸۱/۰، ۸۵/۰ و ۹۱/۰ انتخاب و از روش عددی حجم محدود و الگوریتم سیمپل برای ارتباط بین معادلات پیوستگی و مومنتم استفاده شد. تاثیر شاخص توانی، عدد ریچاردسون، گام در لوله مارپیچ قائم و غلظت حجمی نانو ذره اکسید آلومینیوم بر روی عدد ناسلت بر روی دیواره برای چهار کویل با نسبت انحنای متفاوت بررسی شد. نتایج نشان داد که افزایش غلظت حجمی نانو ذره اکسید آلومینوم از صفر تا ٪۲ باعث افزایش ضریب انتقال حرارت و ضریب اصطکاک می‌گردد. با تغییر گام بی‌بعد کویل از 05/0 به 1/0، عدد ناسلت میانگین %7 افزایش پیدا نمود. نیروی شناوری بر الگوی توزیع دما و سرعت جریان در لوله‌های مارپیچ تاثیر گذاشته و با افزایش آن، الگوی سرعت جریان یکنواخت‌تر می‌گردد.

کلیدواژه‌ها

نانو سیال؛ سیال غیر نیوتنی؛ لوله مارپیچ قائم؛ جابه‌جایی ترکیبی؛ تحلیل عددی

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