IJE TRANSACTIONS A: Basics Vol. 30, No. 10 (October 2017) 1599-1608    Article in Press

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A. Husain and M. Ariz
( Received: March 20, 2017 – Accepted in Revised Form: July 07, 2017 )

Abstract    The present study proposes novel micro-jet impingement heat sink with effusion holes for flow extraction. The design consists of impingement nozzles surrounded by multiple effusion holes to take away the spent fluid. A three-dimensional numerical model is used for steady, incompressible, laminar flow and conjugate heat transfer for the performance analysis of the proposed design. The computational domain is defined by applying symmetric boundary conditions around a unit cell of the jet impingements and effusion holes. The effect of several design parameters, viz., jet diameter, effusion-hole diameter, stand-off and the jet-to-effusion pitch is investigated. A higher standoff-to-jet diameter ratio exhibited lower thermal resistance whereas lower standoff-to-jet diameter ratio exhibited lower pressure-drop. Smaller jet-to-effusion hole spacing resulted in minimum temperature-rise along with maximum total pressure-drop and heat transfer coefficients.


Keywords    Jet impingement, Effusion holes, Spent flow management, Enhance heat transfer, Thermal resistance, Pressure drop


چکیده    تحقیق حاضر، مبدل حرارتی مجهز به میکرو جت با حفره های افیوژن را برای استخراج جریان پیشنهاد می کند. این طراحی شامل نازل های ضربه ای محاصره شده توسط سوراخ های متعدد عایق است تا مایع منتقل شده را از بین ببرد. یک مدل عددی سه بعدی برای جریان پایدار، غیر متراکم، جریان انعطاف پذیر و انتقال حرارت متناوب برای تحلیل عملکرد طراحی پیشنهادی استفاده می شود. دامنه محاسباتی با استفاده از شرایط مرزی متقارن در اطراف یک سلول واحد جابجایی جت و سوراخ افقی است. اثر تعدادی از پارامترهای طراحی، به عنوان مثال، قطر جت، قطر افقی دیافراگم، stand-off و درجه جت به افیوژن بررسی شده است. نسبت بالاتر قطر جت به stand-off ، مقاومت حرارتی پایین تر را نشان می دهد، در حالی که نسبت کمتر قطر standoff به جت نشان دهنده افت فشار پایین تر است. فاصله کمتر دیافراگم جت به افیوژن منجر به حداقل افزایش درجه حرارت همراه با حداکثر افت فشار کل و ضریب انتقال حرارت شد.


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