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

نوع مقاله : مقاله پژوهشی

نویسندگان

حبیب کریمی ¹

کوروش جواهرده ²

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

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

10.22067/jacsm.2024.86865.1242

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

موضوعات

• انتقال حرارت

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عنوان مقاله English

Study of the Effect of Thermo-Physics Parameters in Nano Fluid Non-Newtonian in the Heat Exchanger

نویسندگان English

habib karimi ¹

Kourosh Javaherdeh ²

¹ Department of Mechanical Engineering, Roudsar and Amlash Branch, Islamic Azad University, Roudsar, Iran,

² Faculty of Mechanical Eng. University of Guilan

چکیده English

This study investigated mixed convection heat transfer laminar flow Non Newtonian in heat exchangers helical coils with Nanofluids. Volumetric concentration of nanoparticles are with 0 to 2% and power law indexes are 0.81, 0.85 and 0.91 in this Non-Newtonian flow. Momentum and energy equations solved based on finite volume and simple algorithm method. The effect of power law index, Richardson number, pitch in helical coils and volumetric concentration of nanoparticles are studied on Nusselt number. Results showed that the heat transfer coefficient was increased by increasing volumetric concentration of nanoparticles from 0 to 2%. Also, Nusselt number increased by decreasing power law index and friction coefficient. Heat transfer coefficient was increased by increasing pitch coil and volumetric concentration of nanoparticles, in other word, Nusselt number is increased with 7% when pitch coil is varied from 0.05 to 0.1. Buoyancy forces effected on pattern of Temperature distribution and velocity of flow in helical coils and Temperature distribution become more uniform with increasing Buoyancy forces.

کلیدواژه‌ها English

Nano fluids

Non-Newtonian

heat exchangers helical coils

mix convection

Numerical study

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