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تحلیل عددی تأثیر وجود بافل بر افزایش انتقال حرارت جریان نانوسیال روی یک پله پسرو: رابطه برازش برای عدد ناسلت متوسط | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 12، دوره 53، شماره 7، مهر 1400، صفحه 4309-4328 اصل مقاله (1.68 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2020.18564.6848 | ||
| نویسنده | ||
| حسام مویدی* | ||
| دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران | ||
| چکیده | ||
| در مقاله حاضر، تأثیر حضور بافل بر الگوی جریان و افزایش انتقال حرارت جابجایی اجباری نانوسیال مس با پایه آب در محدوده رژیم آرام روی یک پله پسرو به صورت عددی مورد مطالعه قرارگرفتهاست. برای حل معادلات جریان و دما از روش حجم محدود استفاده شدهاست. در این مطالعه، تأثیر پارامترهای هندسی بافل از قبیل ارتفاع، عرض و تعداد آن، و همچنین عدد رینولدز و کسر حجمی نانوذرات بر الگوی جریان و انتقال حرارت بررسی شدهاست. همچنین به منظور ارزیابی همزمان افزایش انتقال حرارت و افت فشار، شاخص ارزیابی عملکرد تعریف شدهاست. نتایج حاکی از آن است که با افزایش ارتفاع بافل، عدد رینولدز و کاهش کسر حجمی، شاخص ارزیابی عملکرد افزایش مییابد. در تمامی شرایط، مقدار افزایش عدد ناسلت متوسط و شاخص ارزیابی عملکرد، برای عرض بافل معادل 2 برابر ارتفاع پله نسبت به سایر مقادیر عرض بافل، به ترتیب حدود %7/6 و %15 میباشد. همچنین نتایج نشان میدهد که حضور 2 بافل بهتر از تعداد دیگر بافلها است. به منظور جمعبندی، یک رابطه برازش برای نسبت عدد ناسلت متوسط همچون تابعی از عدد رینولدز، کسر حجمی نانو ذرات، تعداد بافل، ارتفاع بافل و عرض بافل با خطای متوسط %2/88 ارائه شدهاست. | ||
| کلیدواژهها | ||
| تحلیل عددی؛ پله پسرو؛ نانوسیال؛ بافل؛ انتقال حرارت | ||
| عنوان مقاله [English] | ||
| Numerical analysis of the effect of baffle on heat transfer enhancement nanofluid flow over a backward facing step: A correlation for the average Nusselt number | ||
| نویسندگان [English] | ||
| Hesam Moayedi | ||
| Thermo-Fluids Department, Faculty of Mechanical Engineering, University of Guilan, Iran | ||
| چکیده [English] | ||
| In this paper, the effect of baffle on the flow field and heat transfer enhancement of forced convection of Cu-water nanofluid flow in the laminar regime over a backward facing step is numerically investigated. Finite volume method is used to solve governing equations of flow and temperature. In this study, the influence of baffle geometrical parameters as height, width and number of baffles, as well as the Reynolds number and the volume fraction of nanoparticles on the flow filed and heat transfer are evaluated. Also, to evaluate the simultaneous of the heat transfer enhancement and pressure drop, the performance evaluation index is calculated. It is obvious that by increasing the Reynolds number and decreasing the volume fraction of nanoparticles, the performance evaluation index is increased. The average Nusselt number and the performance evaluation index for the width of baffle 2 are higher than other cases about 7.6% and 15% respectively. The results show that using 2 baffles must be more beneficial than other number of baffles. Finally, a correlation for the average Nusselt number as a function of Reynolds number, volume fraction of nanoparticles, number of baffles, baffle height and baffle width is presented with an average error of 2.88%. | ||
| کلیدواژهها [English] | ||
| Numerical analysis, Backward facing step, Nanofluid, Baffle, Heat transfer | ||
| مراجع | ||
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