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بررسی عددی تأثیر لایه پوششی متخلخل روی صفحه انتقال حرارت در جریان آرایه جتهای برخوردی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| دوره 55، شماره 3، خرداد 1402، صفحه 337-358 اصل مقاله (2.42 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2023.21640.7481 | ||
| نویسندگان | ||
| سعید خادمی؛ مجید بازارگان* | ||
| دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران | ||
| چکیده | ||
| آرایه جتهای برخوردی قادر به افزایش انتقال حرارت در سراسر سطح برخورد هستند. یکی از چالشهای اساسی در این روش، دشواری تأمین توزیع یکنواخت گرما روی صفحه هدف است. پژوهش عددی کنونی، تأثیر خصوصیات صفحه متخلخل در بستر کانال جریان را بر یکنواختی توزیع گرما روی سطح برخورد جتها بررسی میکند. پارامترهای مورد مطالعه شامل تخلخل، نفوذپذیری و ضخامت لایه متخلخل است. ضریب ارزیابی عملکرد برای در نظر گرفتن همزمان مقدار انتقال حرارت و میزان یکنواختی توزیع آن روی صفحهی هدف پیشنهاد شده است. نتایج نشان میدهند در میان انواع سناریوهای مطالعه شده، پایینترین ضریب عملکرد کلی انتقال حرارت برابر 0/0731 و مربوط به موردی است که لایه متخلخل به طور کامل بستر کانال را پوشش داده و ضرایب نفوذپذیری و تخلخل هر دو در کمترین مقدار خود به ترتیب 12-10×1/76k= و 0/2=ԑ هستند. با این حال هنگامی که ضخامت لایه متخلخل نیمی از عمق کانال را در بر میگیرد و ضرایب تخلخل و نفوذپذیری محیط متخلخل به ترتیب در بالاترین (0/8=ԑ) و پایینترین (12-10×1/76k=) مقادیر خود هستند، بهترین عملکرد کلی انتقال گرما معادل با مقدار 23/45 فراهم میشود. این پژوهش نشان میدهد به کارگیری چیدمان مختلف برای محیط متخلخل میتواند روشی موثر برای تأمین توزیع یکنواختتر گرما با حفظ نرخ انتقال حرارت بالا در جریان جتهای برخوردی چندگانه باشد. | ||
| کلیدواژهها | ||
| آرایه جت برخوردی؛ ضریب عملکرد حرارت؛ یکنواختی انتقال حرارت؛ محیط متخلخل؛ بررسی پارامتری | ||
| عنوان مقاله [English] | ||
| Numerical investigation of the effect of the porous coating layer on the heat transfer plate in the flow of impinging jet array | ||
| نویسندگان [English] | ||
| Saeed Khademi؛ Majid Bazargan | ||
| Mechanical Engineering Faculty, K. N. Toosi University of Technology | ||
| چکیده [English] | ||
| The main objective of the current numerical research is to study the effects of covering the impingement surface by a porous layer in order to increase the heat uniformity throughout the surface without losing the advantage of high heat transfer rates in a multiple impinging jet flow. The porosity, permeability and thickness of the porous layer are considered. The results show that among the scenarios studied, the highest overall heat transfer performance coefficient is equal to 23.45 and corresponds to the case where the porous layer covers half of the depth of the channel and the porosity and permeability of the porous medium are at their highest (ԑ=0.8) and lowest (k=1.76*10-12) values, respectively. This study shows that using different arrangement for porous media can lead to a more uniform heat generation rate while maintaining high heat transfer in the flow of multiple impinging jets.. | ||
| کلیدواژهها [English] | ||
| Impingement jet array, heat performance coefficient, heat uniformity, porous media, parametric study | ||
| مراجع | ||
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