Yazar "Albayrak, Melisa" seçeneğine göre listele

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    EFFECT OF SURFACE RADIATION ON JET IMPINGEMENT COOLING OF A CONCAVE SURFACE
    (Begell House, Inc, 2022) Albayrak, Melisa; Sarper, Bugra; Birinci, Soner; Saglam, Mehmet; Aydin, Orhan
    This study aims to numerically investigate the influence of surface radiation on jet impingement cooling of a two-dimensional concave surface with a slot nozzle. For a constant value of the aspect ratio (h/2W=4.0), varying values of Reynolds number (Re=1185, 2370, 3555 and 4740) and surface emissivity (epsilon=0.05, 0.45 and 0.90) are tested. The cases with or without radiation are comparatively examined. The results are presented as the local temperature variations as well as the variations of the convective and radiative Nusselt numbers, Nusselt number ratio and total Nusselt number. It is disclosed that the increase in surface emissivity improves the overall cooling performance.
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    Öğe
    Elektronik bileşenlerin çarpan jetler ile soğutulmasında nozul konumunun akış ve ısı transferi karakteristikleri üzerindeki etkisi
    (2023) Albayrak, Melisa
    Bu çalışmada, elektronik modüllerin bir dizi sıralı çarpan jet ile soğutulmasında nozul konumunun taşınımla ısı transferi ve akış karakteristiklerine etkileri deneysel ve sayısal olarak incelenmiştir. Çalışmanın amacı, en iyi soğutma etkinliğini veren nozul konfigürasyonunun belirlenmesidir. Çalışma, farklı nozul konumları (sjet/b=0, 0.166, 0.25, 0.375, 0.5) için üç ayrı kanal yüksekliğinde (H/Djet=3, 4, 5) ve beş ayrı jet Reynolds sayısında (Rej=6757, 8586, 10303, 12306, 14023) gerçekleştirilmiştir. Deneysel çalışmalar kapsamında modül yüzey sıcaklıkları ölçülmüştür. Sayısal çalışmalar ANSYS Fluent 2021 R2 yazılımı ile gerçekleştirilmiş ve düşük Reynolds sayılı SST ? türbülans modeli kullanılmıştır. Yapılan çalışmalar sonucunda, jet Reynolds sayısı arttıkça soğutma etkinliğinin arttığı, nozul konumlarındaki değişimin modüllerin çevresindeki karmaşık akım yapısını önemli ölçüde etkilediği ve yerel ve ortalama ısı transfer karakteristiklerinde önemli değişimlere sebep olduğu belirlenmiştir.
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    Öğe
    The Impact of Nozzle Position on Cooling Performance in Electronic Components Cooling with Twin Slot Jets
    (Gazi Univ, 2024) Sarper, Bugra; Kirisci, Nida Emin; Albayrak, Melisa
    In this study, the impact of nozzle position on flow structure and characteristics of convective heat transfer in electronic components cooling with twin jet nozzles are investigated numerically. Assuming that nozzle widths and jet Reynolds numbers are equal, numerical calculations are performed in the laminar regime between the Reynolds number range of 100 and 500 for different nozzle positions (JP 1-2, JP 1-3, JP 1-4 and JP 1-5). Numerical calculations are realized via the ANSYS Fluent software, and velocity and temperature contours, local and mean Nusselt number variation on the heat sources' surfaces and the overall mean Nusselt number variation are investigated for different nozzle positions and Reynolds numbers. As a result of the study, it is disclosed that the flow structure and characteristics of convective heat transfer are considerably influenced by nozzle position, the overall rate of convective heat transfer in JP 1-2 is higher than in the other cases, and it decreases with the displacement of the second jet towards the outlet.
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    Öğe
    The role of jet-to-crossflow velocity ratio on convective heat transfer enhancement in the cooling of discrete heating modules
    (Elsevier, 2023) Albayrak, Melisa; Sarper, Bugra; Saglam, Mehmet; Birinci, Soner; Aydin, Orhan
    This study aims to investigate the role of jet-to-cross flow velocity ratio on convective heat transfer and flow characteristics in a channel with discrete heating modules simulating electronic components. Three-dimensional numerical simulations are performed using the finite volume method. The findings obtained for different velocity ratios of the jet-to-crossflow are compared with the reference case (crossflow solely). While keeping the crossflow velocity and the crossflow Reynolds number (Rec = 5000) constant, numerical calculations are performed for six different velocity ratios (Ur = 1.0, 2.0, 4.0, 6.0, 8.0 and 10.0). The focus is on the role of the velocity ratio (Ur) on the mean Nusselt number (Num) on the modules' surfaces, the Nusselt number ratio (Nur), the friction coefficient ratio (fr) obtained throughout the channel and the thermal enhancement factor (TEF). As a result of the study, it is revealed that the momentum of jet flow becomes dominant over crossflow, the influence of jet flow on convective heat transfer increases, and the thermal enhancement factor increases depending on the increase in jet-to-cross flow velocity ratio.
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    Öğe
    The role of nozzle position and channel aspect ratio in thermal management of electronic modules
    (Elsevier B.V., 2023) Albayrak, Melisa; Sarper, Bugra; Erdinc, Mehmet Tahir; Aydin, Orhan
    In this paper, cooling of electronic modules by a series of impinging jets is studied numerically and experimentally. The study investigates the effects of nozzle position (sj/b = 0 − 0.25 − 0.5) and channel aspect ratio (H/Dj = 3 − 4 − 5) on surface temperatures, local and average heat transfer characteristics and flow dynamics. The numerical analyses are conducted using the ANSYS Fluent software, and the numerical results are verified using experimental measurements. The study's findings indicate that the displacement of the nozzles has a notable impact on the location and sizes of the vortex cells around the modules. This alteration influences the rate of convection heat transfer from the modules’ surfaces. It is concluded that increasing the channel aspect ratio leads to a reduction in convective heat transfer. The highest cooling performance is achieved in the scenario where the aspect ratio (H/Dj) is 3 and the dimensionless nozzle position (sj/b) is 0.5. However, in terms of temperature uniformity, this is H/Dj = 3 with sj/b = 0. © 2023 The Authors