Numerical simulation of mixed convection heat transfer of nanofluid in an inclined enclosure by applying LBM
محورهای موضوعی : فصلنامه شبیه سازی و تحلیل تکنولوژی های نوین در مهندسی مکانیک
1 - عضو هیئت علمی، دانشگاه آزاد اسلامی واحد نجف آباد
کلید واژه: LBM, Inclined enclosure, Nanofluid,
چکیده مقاله :
Mixed convection of Cu-Water nanofluid is studied numerically in a shallow inclined enclosure by applying lattice Boltzmann method. The D2Q9 lattice and internal energy distribution function based on the BGK collision operator are used in order to develop the thermal flow field. The enclosure's hot lid has the constant velocity of U0 while its cold lower wall has no motion. Moreover, sidewalls are taken in to account as adiabatic ones. At 3 modes of convection heat transfer (free convection, force convection and mixed convection), the effects of volume fraction and inclination angle of enclosure are studied for different values of Reynolds number as equal to 10 and 100. Comparison of achieved results as like the streamlines, isotherms and profiles of velocity and temperature versus pervious available ones, implies the appropriate agreement. It is seen that more amount of volume fraction and enclosure inclination angle at the state of free convection would correspond to higher Nusselt number. The incomes of present work show the suitable performance of lattice Boltzmann method in order to simulate the nanofluid mixed convection in an inclined enclosure.
هدف کار حاضر بررسی جابجایی توام نانوسیال آب-مس در یک محفظه شیبدار دوبعدی کم عمق، به کمک روش شبکه بولتزمن است. از مدل شبکه 9Q2D مبتنی بر اپراتور برخورد BGK و مدل تابع توزیع انرژی گرمایی، جهت شبیه سازی دامنه ی حرارتی جریان استفاده می شود. درپوش گرم بالایی محفظه با سرعت ثابت U0 حرکت کرده و دیوار سرد پایینی نیز ثابت است. وجوه کناری محفظه عایق می باشند. اثر مقادیر مختلف زاویه شیب محفظه و کسر حجمی ذرات نانو بر خواص حرکتی و حرارتی نانوسیال در سه حالت مختلف حاکمیت جابجایی آزاد، اجباری و توام و به ازای عدد رینولدز برابر با 10 و 100، بررسی می شود. مقایسه نتایج حاصل از کار حاضر با داده های محققین پیشین نشان دهنده دقت مطلوب نتایج حاصل از مقاله حاضر است که در قالب خطوط جریان، خطوط همدما و پروفیلهای سرعت و دما ترسیم می شوند. مشاهده شد که در حالت حاکمیت جابجایی آزاد، مقدار عدد ناسلت با افزایش کسر حجمی ذرات نانو و زاویه شیب محفظه، زیادتر خواهد شد. تحقیق حاضر به خوبی بیانگر قابلیت مطلوب روش شبکه بولتزمن جهت شبیه سازی انتقال حرارت جابجایی توام نانوسیال در یک محفظه شیبدار کم عمق است.
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