اثر افزودن میکرولوله بر رفتار حرارتی و هیدرودینامیکی میکروکانال چاه گرمایی برای جریان نانوسیال

نوع مقاله : مقاله پژوهشی

نویسندگان

• اکرم جهانبخشی
• افشین احمدی ندوشن
• مرتضی بیاره

دانشکده فنی و مهندسی، دانشگاه شهرکرد، شهرکرد، ایران

10.22067/jacsm.2022.75344.1100

چکیده

در پژوهش حاضر، در یک چاه حرارتی از دو هندسه‌ی میکرولوله و میکروکانال به صورت همزمان استفاده شده است و هدف، بهبود عملکرد میکروچاه حرارتی در خنک‌کاری پردازنده‌های دیجیتال است. همچنین از نانوسیال نقره-(آب- اتیلن گیلیکول 50%) استفاده شده است. به منظور حل معادلات موجود از نرم‌افزار انسیس- فلوئنت استفاده شده است. برای حل معادله مومنتوم از روش UPWIND مرتبه دوم و جهت کوپل میدان سرعت و فشار، روش سیمپل با شبکه فشار جابجا شده به کار رفته است. نتایج بدست آمده بیان می‌کند که با افزایش رینولدز جریان به دلیل بالا بودن دبی، دمای جریان سیال در طول میکروچاه حرارتی تغییر کمتری دارد. همچنین با افزایش غلظت نانوذرات و بهبود عمکرد انتقال حرارت، دمای سطح پردازنده کاهش قابل توجهی می‌یابد. به طوریکه در رینولدز 700 و کسر حجمی 5/0% میانگین دمای خروجی از سیستم برابر1/316 درجه کلوین است و در کسر حجمی 1%، برابر 03/319 درجه کلوین است. همچنین افزودن میکرولوله موجب افزایش قابل توجهی در ضریب حرارتی کلی سیستم می‌شود به طور مثال ضریب انتقال حرارت برای جریان سیال پایه در رینولدز 300، برای سیستم دارای میکرولوله تقریبا 4/58% بیشتر از حالت بدون میکرو لوله است. و برای رینولدزهای 700 و 1500 این افزایش به ترتیب برابر 3/63% و 9/50% است. این امر بیانگر آن است که وجود میکرولوله باعث ارتقای عملکرد چاه حرارتی و بهبود دسترسی انتقال حرارت در قسمت‌های مختلف تجهیز به جریان سیال خنک‌کننده و کاهش مقاومت حرارتی نقاط دور دست پردازنده شده است و در نهایت، میزان گرمای بیشتری از سطح پردازنده جذب می‌شود.

کلیدواژه‌ها

• میکروکانال چاه حرارتی
• میکرولوله چاه حرارتی
• مدلسازی عددی
• نانوسیال

20.1001.1.2008918.1401.34.1.2.3

موضوعات

• انتقال حرارت

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عنوان مقاله [English]

Effect of microtube addition on thermal and hydrodynamic behavior of microchannel heatsink for nanofluid Flow

نویسندگان [English]

• Akram Jahanbakhshi
• Afshin Ahmadi Nadooshan
• Morteza Bayareh

Engineering Faculty- Shahrekord University, Shahrekord

چکیده [English]

In the present study, two geometries of microtube and microchannel are used simultaneously in a heatsink. The aim is to improve the performance of micro heatsink in cooling digital processors. ANSYS FLUENT software is employed to solve the governing equations. The second-order upwind method is utilized to solve the momentum equation and the SIMPLE method is employed for coupling the velocity and pressure fields. The results show that the fluid flow temperature changes less along with the micro heatsink by increasing the Reynolds number due to the high flow rate. Also, the surface temperature of the processor decreases significantly by enhancing the concentration of nanoparticles and improving the heat transfer performance. Hence, at Re =700 and a volume fraction of 0.5%, the average outlet temperature of the system is 316.1 K. It is equal to 319.03 K for a volume fraction of 1%. The addition of microtubes also causes a significant increment in the overall thermal efficiency of the system. For example, at Re = 300, the heat transfer coefficient for the base fluid flow with microtubes is approximately 58.4% higher than that for the system without microtubes. At Re =700 and 1500, this enhancement is 63.3% and 50.9%, respectively. This indicates that the presence of microtubes improves the performance of the heatsink and the access of heat transfer in different parts of the equipment to the cooling fluid flow. It reduces the thermal resistance of far points of the processor, leading to more heat absorption from the CPU surface.

کلیدواژه‌ها [English]

• Microtube
• thermal and hydrodynamic behavior
• Microchannel
• Heat Sink
• Nanofluid

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