شبیه‌سازی عددی اثر میدان مغناطیسی بر عملکرد حرارتی، ترموهیدرولیکی و تولید انتروپی در چاه‌گرمایی میکروکانالی سیلیکونی تحت شار حرارتی یکنواخت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه کاشان/دانشجو

2 دانشگاه کاشان

3 صنعتی شریف*مهندسی مکانیک

چکیده

در این پژوهش به بررسی اثر میدان مغناطیسی بر عملکرد حرارتی، ترموهیدرولیکی و تولید انتروپی جریان آب در چاه‌گرمایی میکروکانالی سیلیکونی ذوزنقه‌ای شکل، با چهار آرایش مختلف، به صورت سه‎بعدی و عددی پرداخته‌ شده ‌است. تراشه الکترونیکی متصل به کف چاه‌گرمایی شار حرارتی یکنواخت 50 کیلووات بر مترمربع تولید می‌کند. شبیه‌سازی‌ها برای دبی‌های جرمی 02/0، 03/0، 04/0 و 05/0گرم بر ثانیه و اعداد هارتمن صفر، 2، 4، 8 و 16 انجام‌ شده‌ است. نتایج نشان می‌دهد در مجموع آرایش A (ورودی به مرکز ناحیه توزیع‌کننده و خروجی از مرکز ناحیه جمع‌کننده) بهترین آرایش است. نتایج برای بهترین آرایش نشان می‌دهد برای همه دبی جرمی‌ها با افزایش عدد هارتمن از صفر تا 16، مقاومت حرارتی بین 39/4 تا 15/9 درصد، نسبت بیشینه اختلاف دمای تراشه الکترونیکی به شار حرارتی بین 81/1 تا 91/7 درصد و معیار ارزیابی عملکرد بین 61/81 تا 15/87 درصدکاهش و تولید انتروپی حرارتی کل بین 13/10 تا 07/77 درصد افزایش می‌یابد. در بهترین آرایش، بهترین عملکرد از دیدگاه حرارتی برای دبی جرمی 05/0گرم بر ثانیه و عدد هارتمن 16 و از دیدگاه ترموهیدرولیکی و تولید انتروپی برای دبی جرمی 02/0گرم بر ثانیه و عدد هارتمن صفر رخ می‌دهد. نتایج تحقیق حاضر می‌تواند به‌عنوان یک ابزار در طراحی میکروپمپ‌های هیدرودینامیک مغناطیسی و قطعات میکروالکترونیک مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Simulation of Magnetic Field Effect on Thermal and Thermo-Hydraulic Performance and Entropy Generation of a Silicon Microchannel Heat Sink Under Uniform Heat Flux

نویسندگان [English]

  • Mojtaba Sepehrnia 1
  • Hossein Khorasanizadeh 2
  • Mohammad Behshad Shafiei 3
1 Faculty of Mechanical Engineering and the Energy Research Institute, University of Kashan, Kashan, Iran
2 Fluid and Thermal, Faculty of Meh. Eng., University of Kashan
3 Professor Sharif University of Technology Department of Mechanical Engineering
چکیده [English]

In this three-dimensional numerical study, the effects of uniform magnetic field on the thermal and thermo-hydraulic performance and entropy generation of water flow through a trapezoidal heat sink, with four different inlet/outlet configurations, have been investigated. An electronic chip embedded on the base plate of the heat sink generates uniform heat flux of 50 kW/m2. Simulations have been performed for mass flow rates of 0.02, 0.03, 0.04 and 0.05 g/sec and Hartmann numbers of 0, 2, 4, 8 and 16. The results show that in overall the best configuration is the A-type arrangement, in which the flow enters the center of the distributing chamber and exits from the center of the collecting chamber. For this arrangement and a constant mass flow rate, with increasing Hartmann number from 0 to 16, thermal resistance reduces between 4.39% and 9.15%, theta between 1.81% and 7.91% and performance evaluation criterion between 81.61% and 87.15%, but total entropy generation increases between 10.13% and 77.07%. For the best arrangement, the best thermal performance occurs for the mass flow rate of 0.05g/sec and Hartmann number of 16 and the best thermo-hydraulic and entropy generation performances occur for the mass flow rate of 0.02 g/sec and Hartmann number of zero.

کلیدواژه‌ها [English]

  • Thermo-hydraulic performance
  • Magnetic entropy
  • Frictional entropy
  • Thermal entropy
  • Silicon heat sink

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 1 (Special Issue)
فروردین 1400
صفحه 517-538

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