شبيه سازي عددي انتقال حرارت درون يك محفظه مربعي با گرمكن موضعي با استفاده از روش شبكه بولتزمن

numerical simulation of heat transfer in a cavity with discrete heat source using lattice Boltzmann method

در اين مقاله، انتقال حرارت جابجايي طبيعي دو بعدي در محفظه مربعي همراه با دو گرمكن موضعي در ديواره پايين كه تحت شار حرارتي نوساني قرار دارد، با استفاده از روش شبكه بولتزمن مورد بررسي قرار گرفته است. ديواره‌ بالايي در محفظه در دماي ثابت سرد بوده و ديواره‌هاي جانبي و اطراف گرمكن‌ها نيز عايق هستند. اثر تغييرات مكان گرمكن‌ها، دامنه و طول موج نوسان شار حرارتي بر روي دماي ماكزيمم گرمكن‌ها و جريان درون محفظه بررسي شده است. نتايج نشان مي‌دهد كه با نزديك شدن گرمكن‌ها به ديواره‌هاي جانبي، دماي ماكزيمم گرمكن‌ها اختلاف كمتري داشته و پايدارتر خواهد بود.

In this paper, square cavitywith air inside, two heaters situated at its lower wall, its upper wall insulated, and its two side walls kept at a constant temperature. The Lattice Boltzmann method has been used for simulation in this study; and the overall goals of this research are to optimize the installation length of heaters and to explore the effects of the amplitude and wavelength of thermal flux fluctuation and Riley’s number. The findings indicate that the flow within the cavity stabilizes more quickly by increasing the difference between the oscillation amplitude and period of thermal flux in heaters.In this paper, square cavitywith air inside, two heaters situated at its lower wall, its upper wall insulated, and its two side walls kept at a constant temperature. The Lattice Boltzmann method has been used for simulation in this study; and the overall goals of this research are to optimize the installation length of heaters and to explore the effects of the amplitude and wavelength of thermal flux fluctuation and Riley’s number. The findings indicate that the flow within the cavity stabilizes more quickly by increasing the difference between the oscillation amplitude and period of thermal flux in heaters