An experimental and numerical study of laminar natural convection in a differentially-heated cubical enclosure

Kubik kapalı hacim içerisinde havanın doğal taşınım hareketleri deneysel ve sayısal olarak incelenmiştir.200x200x200mm3boyutlarında kübik bir hacim ele alınmıştır. Hacmin dikey duvarlarından biri sıcak, karşı taraftakisoğuk ve diğer duvarları adyabatik olarak kabul edilmiştir. Üç duvar alüminyumdan geri kalan üç duvar ısıyadayanıklı camdan imal edilmiştir. Deneylerde sıcak duvarın sıcaklığı elektrikli rezistans ile sabit tutulmuştur. Soğukduvarın sıcaklığı çevre havası ile soğutularak sabit tutulmuştur. Hız ölçümleri için Parçacık Görüntülemeli Hız ölçümü(PIV) kullanılmış, laminer akımda Rayleigh sayısı 1.3x107için üç boyutlu nümerik çözümlemede Fluent CFD paketprogramı kullanılmıştır. Sayısal ve deneysel sonuçlar karşılaştırılmış ve sonuçların uyum içinde olduğu görülmüştür.Normalize edilmiş hız karakterleri gösterilmiştir.

Farklı sıcaklıkta kübik kapalı hacim içinde laminer doğal taşınımın deneysel ve sayısal incelenmesi

Natural convection of air in a cubical cavity was investigated experimentally and numerically. A cubicalenclosure of 200x200x200 mm3dimensions was considered. One vertical wall of the cavity was hot, the opposite onewas cold and the rest of the walls were adiabatic. Three walls were made of aluminum, whereas the remaining threewalls were made of heat-resistant glass. Temperature of the hot wall was kept constant by means of an electrical heaterand the cold wall was cooled by ambient air in the experiments. Particle Image Velocimetry (PIV) was used forvelocity measurements and Fluent CFD software package was employed for the numerical solution of three- dimensional laminar flow equations at a Rayleigh number of 1.3x107 . The numerical and experimental results werecompared and found to be in general agreement with each other. Suitability of a characteristic velocity for normalizingvelocity data obtained was demonstrated.

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