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Publications (14)
Unsteady combined natural and forced convection heat transfer from a rectangular cylinder subjected to upward cross flow is investigated numerically. The working fluids are air (Pr = 0.7) and water (Pr = 7), and the flow is laminar. The governing flow and energy equations are solved using a fractional step finite-difference scheme. The effects of t...
In this paper, laminar natural convection heat transfer was numerically investigated in cubical air-filled enclosures with partitions attached to the walls with different positions. Steady-state governing equations were solved using the Boussinesq approximation by the finite volume method. Two cases were considered that the partitions were placed p...
Heavy machinery operating in outdoor environments is exposed to both solar radiation and intensive load-bearing during operation. The long operating life of these machines and their components is enabled by the greases used in their bearings. The thermal properties of these greases play a crucial role in dissipating both the heat generated by frict...
In this study, combined thermal radiation and natural convection heat transfer from glass and plastic cover flat solar collectors is examined by varying tilt angle and cover materials. The flat-plate solar collector tilt angle is varied from 0º to 45º. The performance of glass, lexan, and acrylic cover materials is investigated. Numerical simulatio...
Bu çalışmada, ard ard yerleştirilen eş sıcaklıktaki iki silindir etrafındaki akış ve ısı geçişi geçici rejimde sayısal olarak incelenmiştir. İki boyutlu, geçici rejimde süreklilik, momentum ve enerji denklemleri Fluent yazılımı kullanılarak çözdürülmüştür. Çalışma akışkanı olarak hava (Pr=0.7) ve su (Pr=7) seçilmiştir. Reynolds sayısı 100, 150 ve 2...
Bu çalışma, kare kapalı kutu içindeki ısıtılmış eğimli eliptik silindirin doğal taşınımla ısı geçişini inceleyebilmek için iki boyutlu sayısal olarak analiz edilmiştir. Çalışmada kare kapalı kutunun yüzeyleri soğuk, eliptik silindir ise ortamın tek ısı kaynağıdır. Analiz yapılırken eliptik silindir için üç farklı eğim açısı (θ=0°, 45°, 90°), elipti...
Unsteady laminar mixed (forced and free) convection heat transfer and fluid flow over long horizontal equilateral triangular cylinder subjected to upward cross flow are investigated numerically. The computation model is a two-dimensional unconfined rectangular domain with an aspect ratio of 1.4. A second order upwind scheme was used for differencin...
Three dimensional combined natural convection and thermal radiation in an inclined cubic enclosure with pins attached to the active wall is investigated numerically. The vertical opposing walls are heated and cooled while the other walls are assumed to be adiabatic. The governing flow, momentum equations and the radiative transfer are solved using...
Alternative synthetic kernel (ASKN) approximation, just as the standard SKN method, is derived from the radiative integral transfer equations in full 3D generality. The direct and diffuse terms of thermal radiation appear explicitly in the radiative integral transfer equations as surface and volume integrals, respectively. In standard SKN method, t...
Bu çalışmada, dik kenarlardan biri soğutulurken diğer dik kenarına ısıtıcı(lar) yerleştirilmiş, alt ve üst kenarları yalıtılmış, yüksekliği H ve eni L olan bir dikdörtgen kutu ele alınmıştır. Dikdörtgen kutunun konumu, ebadı ve ısıtıcı adedi ile boyutları değiştirilerek sürekli rejimde laminer doğal taşınım ile meydana gelen ısı geçişi sayısal olar...
In this study, laminar natural convection heat transfer in 3D rectangular air filled enclosures, with pins attached to the active wall, is studied numerically. Two cases of rectangular enclosures are considered: H/L = 1 and H/L = 2. The enclosure is heated from a lateral wall and is cooled from the opposite lateral wall while the other walls of the...
Bu çalışmada, sürekli rejimde, helisel kanallarda hem hidrodinamik hem de ısıl olarak gelişmekte olan laminer akış koşulları sayısal olarak incelenmiştir. Kanal cidarında sabit sıcaklık ve sabit ısı akısı sınır koşulları uygulanarak kanal için ortalama Nusselt sayısı ve sürtünme faktörü belirlenmiştir. D çaplı helisel borunun sarım sayısı, helis ya...
